This is just a geeky, cost calculating experiment really. Nothing scientific or anything. Just a fun thought on how easy it is to calculate the ROI for the low cost of Syspeace licenses.
Yesterday evening we had a really interesting meeting with a future reseller so we thought we’d take a look at the actual numbers of blocked attacks. Syspeace had blocked over +314 000 brute force attempts on Windows servers worldwide.
This morning I started thinking.
If each attack takes 15 minutes to manage manually with these steps
1. Find the IP address of the attacker in the event viewer, then block the attack (in the internal or external firewall)
2 Trace the origin (using traceroute, nslookup and whois) and log it somwhere
3. Decide if it’s worth following up and making ot a police matter
That would mean we’ve saved 314 000 * 15 minutes = 78 500 man hours of manual work around the world.
The US$ is about 6.8 Swedish Cronas today.
If each tech has a salary of 35 000 (approx. 5100 US$) per month (an average tekkie salary in Sweden) the average hourly salary is 218 Swedish Krona (32 US$) .
For the employer , that number is about the salary time 1,7 (due to taxes and stuff ) so that would basically amount up to 371 Swedish Krona as a cost for the employer.
What we saved in manual labor with Syspeace would be 78 500 * 371 = 29 192 187 Swedish Cronas (or 4 292 968 US$) in actual cost savings bot most of all, we’ve made the life of the sysadmin easier and he can focus on other stuff than managing brute force attempts and let Syspeace do the work.
A lot of IT projects could do with an extra 78 500 man hours..
If you’re up for cutting costs and increasing security at the same time, have a look at the free trial download at the Syspeace website
By Juha Jurvanen
Senior IT consultant in backup, IT security, server operations and cloud
The goal with Syspeace is to simplify security management and prevent brute force hacking, primarily in Microsoft Windows Server environments and is targeted at system administrators that manage servers, either ther own ones or for external customers or even in data centers such as cloud service providers. Syspeace automates intrusion attempts, brute force attempts, (eventid 4625) on Microsoft Exchange servers (including the OWA interface and protecting the receive connectors) , Microsoft Terminal Servers and basically any Windows server that uses Windows Authentication such as Sharepoint, Exchange, Terminal Server, Citrix, SQL Server and so on.Around the clock. .
Background and history The background of the product is that within the Swedish-based cloud service, rCloud Office , from Red Cloud IT where I was the Cloud Architect and CTO , the realization of how many excessive login attempts generating eventid 4625 (failed login , unknown username or password ) from all around the world there really was and that this needed to be automated in aspects of the administration of it and to tighten security since no brute force prevention is built into Windows. I also quickly realized that none of the other Cloud Service providers has any of this in place and this scared me.
A single attack could render in 5000-6000 login attempts and go on for 2-3 hours. This was a waste of bandwidth, server RAM and CPU since each login-attempt had to be validated and there was always the fear of someone actually succeeding to login or that a user account could be blocked out deliberately just to cause a DOS for the services.
For each brute force attempt most labour was manual and time consuming
First, the log files had to be checked in Windows Server eventlog.
Second , the attack had to be manually blocked the incoming IP adress in the firewall.
As a third step attacker had to be traced with TRACERT and NSLOOKUP and WHOIS to determine from where it originated and decide when it would be suitable to handle it as a police matter or not.
At night, no one actually could handle an attack so it would be managed the next day which left us vulnerable during off-hours.
Of course this manual labour took quite some time the realization came quickly that it would become an absolute nightmare in the end if something wasn’t done. All customer expect these countermeasures to in place.
The need for something to automatically block the intrusion attempt, notify us the IP address and from where the attack was made popped up
I started searching the Internet for a cost effective, easily administered with graphical interface and yet effective solution.
There were a few simple script solutions out there but unfortunately, none of them really matched what was to be accomplished i.e. block the intrusion attempt based on rules, track down the attacker geographically and unblocking the IP automatically and reporting the attack.
It had to have the ability to easily manage WHITE LISTS, preemptive BLACK LIST, handle SMTP AUTH attacks and quite a few other features as well that just couldn’t be accomplished with scripts. It had to be easy to use with a graphical management interface to keep the administration and the learning process to a minimum and the autoblocker had to run as an integrated Windows service for optimal performance.
The idea and concepts takes shape
I came up the idea and a concept on how to get the job done, wrote down a few technical ideas and specs, wrote some proof of concepts and thought about the idea and how to actually accomplish it and came across the guys of the Syspeace develepment team at Treetop and work began. Since I’m not a developer myself, I thought I’d leave the hardcore development to people who actually know what they’re doing.
I’m the guy with concepts and ideas but when it comes to actually writing code.. well.. I’m not a first hand choice. I’ve got a few a more ideas up my sleeve but let me get back to you on that 🙂
After the first alpha test we also realized quickly we needed to add some more intelligence to it as, for instance, if an IP fails to log in x number of times during x amount of time and then succeeds, the system shouldn’t remember it as a possible attacker and be blocked further down the road for a failed attempt. People are still human and sometimes people type in the wrong password. A lot of work has beent put into the intelligence ”under the hood” of Syspeace.
We also realized that the software works just as well protection your servers from LAN connections, giving you a better understanding of what really goes on woith your users and if someone on your LAN is trying to access resources they’re not supposed to or if someone has been infected with some kind of brute force – virus.
Today, we get an email stating from where the attack originated (the DNS name if found, the IP address and from which country the attack originated). We’ve got reporting, separated mail notifications depending on events and we’re adding more and more features all the time.
We also get username that was tried which is extremely helpful since we immediately can see if it is just ”background noise attack” or if it is targeted specifically or even worse, a competitor tries to login to the central systems without explicit permission or an ex-employee/ex-customer is trying to access an account that they no longer are authorized to.
So far Syspeace has successfully blocked over 2,5 Million brute force attacks worldwide and I dare say it has decreased the workload for quite a few system administrators out there.
Syspeace supports Windows Servers 2003 – 2012 R2.
This is what I’d called a ”blogomercial” with a hidden agenda but I hope you’ll find some interesting pointers anyway, the commercial part is at the end really. 🙂
Servicing your users and customer over the Internet
Anything facing the Internet is a potential target for anyone who wants to gain access or disrupt your data operations. If it’s here, people will try to get in or make it stop working. That’s just the way it is and I’m sure you’re aware of it.
There’s different methods for the attacks actually, they could be a DOS attack, a DDOS attack , SYN Floods to name a few
The motives behind any of these could be a number of things such a hacktivism, former employees or even current, script kiddies just fooling around, organized crime, extortion, theft of company secrets and so on.
Just take your pick really.
You need to make a SWOT analysis and have a Business Continuity Plan (BCP) in place for the different scenarios actually. It sounds expensive (and, yes, it can be) but the day you servers are under attack, you’ll be happy you took the time to create one. Trust me. So will your CEO be.
A few of the different techniques for DOS, DDOS , Brute force
The methods of taking down a server vary. As with everything else in the real world, there are different tools to get the same job done, it’s basically a matter of taste and skill and how much time the attackers have on their hands. If you’ve pissed of a state , you’re probably going to have an extremely bad day since they do have extensive resources to keep you ”offline” for as long as they want really.
For instance there’s SYN flooding , basically equivalent to old school prank calling,
Send a network packet to the server announcing you want to ”speak” , the server responds but no one is there to continue the ”conversation” . If you do this a few hundred thousand times, the server will have quite a few ”phone calls” to attend to and therefore can’t actually be bothered with picking up the ”phone” for the legitimate ”calls” thus making a DOS attack meaning ”Denial of Service”, the server can no longer service what it’s meant to service, that being your users or customers.
DOS and DDOS Attacks
A DDOS (Distributed Denial of Service) attack is actually the same thing , the main difference being that its spread out over an extremely large number of computers around the world doing the same thing , making it very difficult to manually block each and every one of them in the firewall manually. These computers are usually part of something called botnets and the users of these computers are rarely aware even of them being a part of it. In this scenario you need to contact a lot of people and get it sorted, for instance your ISP, the server guys and firewall guys and you need to have a look at the BCP. What do we do when this happens and so on. Do we move the servers, up the bandwidth, go out of business, wait until it passes and so on ?
MITM, Man in the Middle
Using MITM (Man In The Middle) attacks is also popular method if you haven’t secured your server and your communications with valid SSL certificates. Quite a few actually use self-issued certificates on the websites and on their OWA site and that’s not a good thing. When someone who knows what they’re doing connect to a site that has a self issued certificate the first thing that comes to mind is ..”hmm .. these sysadmins are cheap and lazy and I’m fairly sure they just set this server up using default values.. let’s have a look” .. )
The problem is that there’s actually no real way for the connecting computer to validate that the site it is connecting to actually is the site it’s hoping for. It might as well be someone claiming to be that site since the certificate used can’t be validated by a third party (the ”Trustad Authorities”). This way , phishing attacks (”phising” is when you ”phish” for a users valid credentials to use them later at the users real websites)
It’s absolutely no guarantee even if you do use a valid certificate since also the ”Trusted Authorities” can be hacked and therefore all of their certificates can be compromised (yes, it’s already happened a few time in the past year, GoDaddy, Verisign and even Microsoft themselves realized they had a bug in how Windows Update actually validates that it is connecting to the Windows Update site and nowhere else.)
Brute force attacks
Another method of rendering you server useless is to use a brute force attack on the usernames (sometimes also known as a ”dictionary attack” ) .
If you know the naming convention of the usernames used at the company (quite often as easy as the email addresses of the employees or compaynameusername) you can keep on pounding the server with valid usernames and wrong passwords , hopefully rendering the user accounts to become locked out all the time by triggering the Account Lockout Policy. An easy entry point to this is the .. *tadaa* .. yes, you guessed it, the Microsoft Exchange Webmail/OWA interface (or for instance a Sharepoint login interface) .
It’s not that difficult to find out what mail server a company is using (easiest way is to use the NSLOOKUP command and search for the MX record, start a telnet session to the server and see what it presents itself as . It’s usually in cleartext what kind of server you ”talking” to )
Once you know this , you also know a few other things automatically.
Practical use for the information
By default , there are two valid usernames in a Windows Active Directory (I will stick to 2008+ AD here)
First, it’s the older naming that quite a few still uses. This is the COMPANYNAMEUSERNAME naming convention . These usernames can be difficult to guess , it could be the users first name (COMPANYNAMESAMUEL) or the the first characters of the first name and surname (COMPANYNAMESAMSMIi) and so on. It’s basically more or less a question of how large the company is.
The larger it is, the longer the username but also , much more standardized in naming since otherwise it becomes an administrative nightmare for the system administrators and we are a lazy bunch really. We want to be able to find our user quickly and and easily in order to support them and keep track.*grin*
The easier approach is to attack the user account using their mail addresses. Quite a few sysadmins don’t realize that the mail address is also a valid logon name since they are used to thinking of logins using the the old naming convention.
Since they also want to provide access to webmail , and usually, 97 times out of a 100 (no, I just guessed a number, I have no statistics to support it, it’s just a gut feeling, ok ? ) they don’t require any special VPN software for their user to access the webmail (OWA) interface since the whole idea is to let users easily connect to their mail, wherever they are.
This means that the OWA interface is reachable for the entire world to try and login into and thus leaving you open for DOS, DDOS, brute force attacks and so on .
SPAM and overload
There’s also so the various methods of overloading our server with SPAM and viruses.
It’s not unusual to use the secondary MX record (which is used for failover in case the usual mail server has some issues) for your mail domain actually. Most companies that have secondary MX in place have a more or less effective defense on the primary MX but the secondary is often forgotten and is a popular way to over flood a server with various SPAM.
Quite often , they’ve set it up in the way that the primary MX might point to the secured, external provider or the secured, primary mail server interface and the secondary points directly to the mail server, thus not taking the way through the washing and security mechanisms in place but instead be delivered directly to the mail server.
A few countermeasures then ..
So , what can be done then? Should you close down the OWA / webmail interface? Stop using email? Revert to faxing?
No, of course not
Here’s a few pointers on what I’d suggest on securing and managing your Exchange servers. It’s not all the tricks in the book and I’m sure I’ve missed out on quite a few ones really but it’s a start I guess. Just, remember, there is no such as thing as absolute security.
1. Minimize the attack surface behind a good firewall that can deal with the SYN Floods and port scans and stuff. Be cautious not to open up anything more than what’s absolutely necessary to and from the outside world.
If you’re using an external ”mail cleaning service”, don’t allow port 25 from any other IP/IP ranges than them. If your users are to use your Exchange Server for relaying , set up a connector with SSL and SMTP authentication on other port and enable logging on it. Protect it by using Syspeace (yes, here the first commercial part so you’ll see where this is headed 🙂 )
Also, best practices is to use a DMZ (Demilitarized Zone) for any of your serevr facing the Internet although when I start to think of , I’m not sure if that’s necessary. There’s different opinions in the matter really. The idea is to have the attacker not being able to come in further into you network, should they succeed in gaining control over the server on he DMZ. Unfortunately, I’m fairly sure that somewhere on the those servers there are administrator password and stuff that’s useful knowledge for further access into your network.
2. Get valid, proper, shiny and bonafide certificates for your communications. It’s not costly and not complicated to implement. Its mainly the hassle of you having to remember when to renew them, otherwise stuff will stop working when they expire.
4. Enforce an Account Lockout Policy and enforce complex password. Yes, people will hate you but they will hate you even more if someone actually succeeds in hacking your users data. Have a look at the link above about Account Lockout Policies though. Do not have local users more than necessary on the Exchange Server itself.
5. Verify all of the websites with the NTFS permissions when it comes to file access, remove the IISTART from the root and remove any default .HTML and .ASPX pages that don’t need to be there.. Don’t let he attackers realize you’re lazy and using default values everywhere. I’ve seen so many servers withe default start page on IIS and that’s just not right.
6. Verify also you’re not open for relaying ( this is usually default nowadays) . Anything that is installed by default by the IIS , take good look at it and decide if it really needs to be there, If not remove it!
7. Redirect all of the 404 and other serious html errors to somewhere else. Google, your worst competitor, your mother-in-law, 127.0.0.1 , anywhere really , just get rid of the traffic from your own site. A lot of 404 errors could mean that someone is trying to find out stuff about your server and if you have any default installed scripts or pages in place that can be used to gain access to your server .
8. Antivirus of course.If you’re not using one today, well.. maybe you shouldn’t be reading this at all but you should be out looking for another job really. I hear there’s good money in flipping burgers.
I’ve used most of them , some are good and some .. well , just aren’t. For the moment I do use Fsecure or Trend a lot. I’m not a big fan of McAfee due the fact they’ve released a few .. not so good updates the recent years that crashed servers around the world. I’m sure they a great product, it’s the product testing and quality verification that needs improvement. Just remember , the same thing goes for antivirus as for 0day attacks, if you antivirus provider hasn’t released any protection against that virus you just got into your system , there’s not that much you can do about it, more than start cleaning your server once you the antivirus updated or even restore your server to a state prior to the virus. An antivirus is not the single point of protection. Common sense is the best antivirus protection in the world.
9. Also, as a complement, use an online service also that filters all of your incoming and outgoing mail from viruses and SPAM and also have you secondary MX records point to it. Usually these services also hold you mail in queue if they cant’ be delivered, buying you time to change the IP addresses or server if you are under attack and not losing any mails.
10. Set up DNS Blacklisting and DNS GREY Listing. It’s not very complicated to do really and you do get rid of a lot of unwanted traffic.
11. Don’t use the ”validate reverse DNS” options since a lot of companies haven’t actually set it up correctly so you’ll just risk not getting email from them. The idea is good but it doesn’t work in real life.
12. Enable logging on the connectors and basically enable logging on everything. READ!! the log files. Don”t just turn on logging and let it be. At least once a day , have someone read the (or script queries against the log files ) and see what’s really going on. Search for anything out of the ordinary.
13. Remember to check your mail queues on a regular basis If you’re starting to have loads of undelivered mail to and from various domains you could actually have a DNS server that’s under attack , not being able to service your Exchange server with required information . On the subject of DNS servers. There’s absolutely no point in having your DNS servers reachable through the firewall thus enabling attackers to flood it with DNS queries and UDP floods. Also, you external DNS server needs to be secured! Have a word with your ISP or whoever is running the external DNS server and see what they’ve got in place.
14. Patch you servers with all of the security patches that are released. Do it as quickly as possible. There’s is absolutely no defense against 0day attacks.
A 0day is a security bug in the software of the server your running and they vary on how much impact they may have. The name comes from that it is day 0 of it’s public release and the manufacturer, in this case Microsoft, hasn’t released any patch against it leaving you vulnerable no matter what you do. Some of them are even just a nifty way of adding stuff (specific strings ) to the URL or the service the attacker wants to reach and bypassing all of the built in security by ”fooling” the server.
15. Disable services that don’t need to be running, DHCP client and stuff. Although they’re not reachable from the Internet , they quite often are reachable from the inside and should you have an attacker on the inside of your network or a virus infected computer , you might be having a bad day.
Minimize attack surfaces, once again And keep the server resources to actually servicing what they’re supposed to instead of having unnecessary stuff in RAM / CPU . This is of course valid for any servers, Citrix, terminal servers, domain controllers, Sharepoint and so on.
16. I’m fairly sure you’ve set the ActiveSync functionality for your users since it is an effective and easy way for them to synchronize their iPads, iPhone, Androids and so on . Beware that you also remember to periodically check the various devices associated with the users. If you’ve got a user synchronizing more than 10 devices at the same time from different parts of the world, well.. either he or she is really into gadgets or their user validation information may have leaked (username / password)
17. If someone quits the company, be sure to use the mechanism for clearing the remote device from calendar entries, contacts and email using the built in mechanism in the Exchange server (it’s really easy to do ) . And, of course, if a user reports they’ve lost the devices, same thing, Clear the old device and unpair it from the Exchange server. Unfortunately, users don’t always tell you when they’ve lost stuff . They just buy a new gadget, set it up, synchronize and don’t think twice about the old one and what i actually contains.
18. A bot off topic but it has to do with BCP mentioned earlier. Be sure , please, be supersure even , you have adequate backups , containing multiple generations of data and have at least three or four of theses complete generations stored offisite in some way. Using an online backup service or just moving your tapes/disk manually out of the building. Test your DR Plan (Disaster Recovery plan) at least once a year to verify that your backups contain all you need if something happens. Be sure o have an updated technical description of how to restore your entire environment.
In which order?
Onto what hardware/virtual machines?
That’s six quite easy questions that sum up what that technical restore plan should contain. It should be able to be read even be outside consultants in case of your entire IT department got killed in a freak barbecue accident the night before.
Keep it simple but detailed.
Include all necessary background info such as server configurations, IP plans, passwords and where the data is stored. a Network map explaining dependencies might also be useful. Don’t use in house mumbo jumbo and nicknames describing various systems and stuff.
Write your DRP from the perspective that you’re gone (in the freak barbecue accident) and the person reading it has never ever heard of your internal system before.
If you don’t have all of these things in place, the day something really happens you will regret you didn’t take the time to do it. Trust me. I’ve worked as a Disaster Recover Technician and Consultant at SunGard Availability Services in Sweden for 8 years . I’ve seen grown men cry and unless it’s not for the unexpected death of their favorite dog or a lost game for their favorite sports team , it’s not a pretty sight.
19. Also a bit off topic but still important. Be sure to have a good monitoring on the hardware aspects of your server and operating system aspects (running services, disk space used and so on ) . Personally I’m fond of Spiceworks för monitoring server health, licenses and inventory but it all boils down to resources and taking the time to set it up. As long as you have some working monitoring and someone who actually deals with the alerts that come up.
20. Sign up for the Microsoft Security Bulletin newsletter (and all similar that has to to do with your environment). Stay up to date and up to speed on what’s going on out there. Being a sysadmin is not a 9-5 job, it’s a lifestyle and the ones who do all of these things will be better protected once they’re attacked.
And onto the unmasked commercial part then ..
Since the focus on this article was to write in general about Exchange Server security and the hidden agenda was to mention Syspeace I’ll get back to it . *smooth, eh ? 🙂 *
Syspeace will help you in some of the scenarios above, particularly in the brute force prevention department. It’s easy to use and you’re instantly protected from the moment you’ve set it up)
It protects you from any brute force hacking attempts using Windows Authentication ( Terminal Server, OWA, RDWEB, Sharepoint, CRM, RDP, netlogon and so on ) and it also contains a Global Blacklist to have you preemptively protected from known attackers around the world.
It will not help you in all of the scenarios described above but it will absolutely make you life as a sysadmin much easier since it automatically blocks the attack, tracks it down and reports it. For the sysadmin it’s just an email telling him or her that
”This IP address with this DNS name from this COUNTRY tried logging in using this USERNAME and is now blocked according to this rule you’ve set up ”
The cost is equivalent to any antivirus so I’d hardly call it costly.
It’s easy to set up so you won’t be needing to redesign your infrastructure or call on expensive consultants to get it up and running. You’re done in 5 minutes. Tops.
Intro on brute force prevention tactics and some misconceptions
Protection from brute force attempts on Windows servers has always been a nightmare and would continue to be so if not .. Yes, I admit, I will come up with a solution further down.
Most system administrators with selfrespect start off with the best of intentions to actually keep track of brute force attempts but eventually give up because of the sheer number of attacks that occur daily.
Others, unfortunately, believe that a firewall takes care of the problem which it doesn’t or that an account lockout policy is the answer. Neither of them is and I’ll show you why.
The firewall approach:
Think about it. What does a firewall actually do ? The role of the firewall is to block traffic on unwanted ports and to drop portscans and variuos SYN FLOOD attacks. That’s about it. A firewall is basically a harsch doorman deciding who gets in to speak with the guys on the inside and who doesn’t.
If an attacker actually connects on a valid port , the traffic is redirected/port forwarded to the server in question let’s say the webmail interface of a Microsoft Exchange Server or a Microsoft Windows Terminal Server or a Citrix Server. Once the attacker is there, the actual logon request is handled by the server,not the firewall. The logon process is managed by the Windows Authentication process (which in turn may be validated against Active Directoy or a local user database using SAM). The firewall is already out of the picture really since it has no connection with the Windws server apart from the TCP connection and keeping it alive really. They don’t communicate the result of the logon process between eachother.
Also, a changing of from standard ports won’t help you much, will it ? The logon process is still managed by the Windows Server although you will get rid a of a lot of portscans and ”lazy background, script kiddie attempts” if you’re using non standard ports. Basically you get rid of the script kiddies but the problem isn’t solved, the traffic is still redirected/port forwarded to the server that does the actual authentication.
Using for instance a Remote Desktop Gateway won’t handle the problem either. Using a RDP Gateway minimizes the attack surface, yes, but it is still reachable and the user logons still have to be validated. The problem is with any server that services logon request basically, regardless of on what ports and how they get there. That is Microsoft Windows server, Exchange Server, Citrix, Sharepoint, CRM , Terminal server and so on . The list can probably go on and on.
There’s also the risk of stuff stops working each time you apply some updates or patches to your Windows Servers if you start changing standard ports or standard configurations. It’s happened to me a few times and it’s not that amusing to be honest when you’ve got 1000 users not being able to log in beacuse you’ve just done your job and patched the servers to keep peolpe datas safe. Trust me, that’s not a good Monday morning.
The VPN approach:
Yes. That’s a safer approach but also here we do have some issues. First of all, it’s not that easy to keep track of VPN certificates, to set all of it up and manage all the licensing costs (that can be quite significant really ) and (sometimes costly) hardware you need to have in place. Historically there has also always been performance issues with most VPN solutions since all traffic is directed through one or a few VPN servers / connectors. Some of them also charge you for the bandwidth you want it to be able to use for VPN connections or charge you for the number of simultaneous VPN connections, A VPN solution can be quite costly as an initial investment and taking into account all of the administration involved in it.
You also probably won’t be demanding your users to have a VPN connection to the Microsoft Exchange OWA etiher snce the whole idea of the OWA i that it’s supposed to easy to reach from anywhere. I know there are some companies actually requiring VPN even for OWA and that’s just fine I guess but the more we’re moving our data and applications to cloud services, this hassle with different VPNs and stuff will eventually be fading into the dark corners of the Internet (that’s my personal belief anyways). The thing is that your users don’t want to be tied down by complicated VPN clients and stuff, users nowdays are used ”stuff just working” and it has to be easy and intuititive for them. The days of the ”System Administrators from Hell” implementing all kinds of complex solutions to keep stuff secure and forcing users to having very specific and complex ways of accessing data are over. They were good times, good times but they’re over. Deal with it.
The IDS/IPS approach:
Using a centralized IDS/IPS This is a more efficient method, yes. The downside is, most of these systems require you to change your infrastructure and get specific, costly hardware, licenses and costly consultants to get it up and running. And someone needs to monitor it, take care of it and so on. There are parllells to the VPN approach here although an IDS/IPS does a while lot more such as examines all the network traffic, examines it for malicious code and so on. I’m not sure actually if an IDS/IPS can communicate with the Windows Server Authentication Process so I’ll actually won’t say anything about that. I would presume they can, otherwise I fail to see the point (from the brute force logon prespective, that is) and you’d still need to handle the logon attempt on the Windows server.
The Account Lockout Policy approach:
The acccount lockout method is also flawed due to the fact that an attacker can quite easily cause a DOS (Denial of Service) simply by hammering your server with invalid logon request but with valid usernames, thus rendering the accounts unusable for the valid users. Basically, all he (or she) needs to know is the user logon name and in many system , it’s not tha hard to guess (try the companynameusername or the mail address for the user since it’s quite often also a valid logon name if you have a look at the properties of the user in Active Directory Users and Group snap-in)
The Cloud Computing approach
We are shifting more and more of our data and applications into various Cloud Services (like it or not but, it’s a fact and you know it). This way we do get rid of some of these problems on our own servers and hopefully, your Cloud Service provider actually has a plan for these scenarios and has the necessary surveillance software and systems in place. If you’re using a Cloud Computing platform based on Windows Servers, you should actually ask your provider how they handle brute force attempts on their servers. Most likely they will give you one or more of the scenarios described above and, as I’ve showed you, they are not adequate to handle the task at hand. They’re just not up for the job. Feel free to ask your own provider and see what answer you get. My guess is .. mumbo jumbo but basically , they don’t have anything in place really, more or less.
You could even try logging into you own account with your own username but the wrong password loads of times and see what happens. Will it be locked out? Will your machine be locked out? How does your Cloud Srvice Provider respond and are you informed in any way that an intrsuion attempt has been made using your account ? How many times can anypne try to access your account without you being notifed of it? And from where are they trying to get to your data and why?
Personally I know of only one Cloud Service Provider that has also taken these questions into account and that’s Red Cloud IT in Sweden.
Is there a solution then?
Yeah. I told you so in the beginning and even if choose not to use what I suggest, I highly recommend that you start thinking about these things properly because these problem will accelerate in the future. Just take a look at all the hacktivism witj DDOS attacks,going on out there. It’s just a start because the Internet is still young.
First of all, and this is extremely important you realize, , it doesn’t matter if you hosting your own servers or if you’re using VPS (Virtual Private Servers) hosted somewhere else or even if you’re a Cloud Service Provider. The basic principal stands: if you are providing any kind of service to users using the Windows Authentication mechanism you should be reading this and hopefully my point has come across.
If you’re having brute force attacks on your Windows systems today and I’m pretty sure you do (just turn on logon auditing and I’m sure you’ll see you have more than you actually thought you did, *for some odd reason this is NOT turned on by defaut in Windows*) there’s a few things you should be doing (that I’m guessing you’re not beacuse you’re not a cyborg and you need to sleep, meet your friends and family and actually be doing something productive during your work hours). On the other hand, if you are doing all of these things I’m guessing you have quite a large IT staff with a lot of time on their hands. Good for you. Call me and I’ll apply for a position.
First of all. Block the attack.
You need the attack to stop! Instantly. This is of course your first priority That’s basically blocking it in the firewall, either in the local Windows firewall or the external one, it’s actually up to you which way is the easiest one. The reason is that you don’t want to be wasting CPU and RAM and bandwidth on these people (or botnets) and of course, you don’t want them to actually succeed in logging on (should you have a lousy password policy in place ) or even them disguising a real intrusion attempt behind a DDOS attack to fill your logfiles and hide themselves in there. (Yes, it’s not an uncommon method). There’s also quite a few reports of DDOS attacks being used to disguise the actual reason for it which is to find out what security measures are in places for future reference. The ”know your enemy principal”.
Second. Trace the attack. From where did it come?
Second , you need to find out from where the attack originated and what username was used. This is because you want to know if it is a competitor trying to hack you and access your corporate data or if you find yourself in the interesting position of your own username trying to login from sunny Brazil and you’re just not in Brazil (although you’d love to be) . You’re in Chicago looking at winter. Somethng’s up.
You also want to see if it’s a former employee trying to log on and so on .. This is stuff you need to know and keep track of since there may be legal issues involved further down the line.
Points one and two , you want to be handled in real time. There’s no use for you to find out two days after the attack that something actually happened. You want it stopped, reported and handled as it happens.
The legal stuff.
Third, you need to decide what to do with your information. Should it be handed over to the legal departement, your boss, the police or is it just ”nothing” and can be discarded ?
So. ”What would you suggest as a solution then” ?
The easiest and most cost efficient way to handle brute force attacks on Windows server is to have an automated sysem to block, track and report each attack and that’s where Syspeace comes into play.
Syspeace is a locally installed Windows service, thus using a minimum of system resources, that monitors the server for unwanted logon attempts and blocks the intruders in real time in the local firewall based on the rules you’ve set up. For instance ”if this IP address has failed logging on 20 times during the last 30 minutes then block it completely for 5 hours and send me an email about it”
This means that you can for instance set up a blocking rule that is you ”Account lockout policy – 1” in your rules and that way simply blocking the bruteforce attack but not locking your users accounts and causing them unecesseray disruption.
Since Syspeace monitors the Windows Authentication logon oprocess, it doesn’t matter what firewall your using or what ports you’re using, the monitoring and blocking is done where the actual login attempts is made and therefore caught and handled automatically.
Once the intruders IP address is blocked, it’s blocked on ALL ports from that server which means that if you have other services also running on it (like FTP or well.. anyhting really) those ports and services are also protected instantly from the attacker. Not giving them the chance to find other ways of gaining access to that server through exploits.
A few other features in Syspeace
A few other nice features with Syspeace is for instance the GBL (Global BlackLlist) where every Syspeace installation around the world , reports each attack to a databse where they are examined and weighed and , if deemed ”meneace to Internet and all of mankind” the database is then propagated to all other Syspeace installations. In this way, you’re preemptively protected when the bad guys come knocking on your door. So far , there has been over 200 000 brute force attcks blocked by Syspeace worldwide (and that’s just since mid July 2012) and some of them have made it to the GBL. Lucky them.
Of course there are white lists and stuff, giving you the ability to have your customers or internal users keep hammering you servers all day long if they (and you) want without being blocked out.
There’s also the Attack Cintrol section that gives you the ability to sort out information about successful and failed logons, findind the ones that are trying to stay under the radar, viewing reports.
You get daily and weekly reports email to you and each attack is also mailed to you with detailed but easy to understand information from where the attack originated including country, what username was used and how many times they actually tried to hack or overload you. This gives you the ability to quickly see of it’s something you should be taking care of or just carry on with your working day and leave it be with a smile on your face.
The GUI is easy to use (and there’s an even easier coming up in the next version) so there’s no need to hire costly consultants to be up & running or start using various scripts and change parameters in them to suite you needs and hope for the best and hope they don’t hang your servers.
Syspeace also protects the Microsoft Exchange Server Connectors from being attacked.
There is a Windows 2003 version coming out and there will be more features added as we go. The roadmap and to-do list is ..well.. extensive to put it mildly.
The licensing is not steep, I’d even dare say cheap and it’s extremely flexible.
As an example. If you buy yourself a new server today (evereybody loves new toys ) , you install Syspeace on it and then you get yourself a second server in 4 months. You can easily align the licensing renewal dates for both servers , not having to keep track of licensing renewals scattered over the entire year. If you’re up for , you could even byt yourslef just a one months license. Or a week. I’s up to you and what needs you have.
Download a free trial and see for yourself.
We know it works and so does all of the people around the world who are already running it.
Syspeace helps Windows administrators handle the gruesome tasks of tracking, blocking and reporting brute force attacks on Windows servers.
Through the use of the GBL (Global BlackList) Syspeace users are preemptively protected from brute force attacks so to be honest, the number could actually be higher than 200 000 so far since the attackers once reported into the GBL are alreday blocked and thus not reported again into Syspeace.
Syspeace monitors incorrect login attempts on Windows servers, Exchange Servers, Citrix Server, Terminal Servers, Exchange OWA, Terminal Server RDWEB and more
Download a free trial of Syspeace and see for yourself how easily you can prevent intrusion attempts on your Windows server and cut your costs on administration. Installation and configuration within minutes. After installation and starting up the Syspeace service you are instantly protected..
And no additional assembly required.
No need for new and specialized hardware with runaway licensing costs,no need changing all of your infrastructure to implement a new IDS/IPS system and no costly security consultants. It’s just that easy.
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