Last Updated: 2011-07-25 03:12:44 UTC
by Chris Mohan (Version: 1)
This is a hypothetical scenario to get the old grey matter thinking on how you, the incident handler, would respond. To make this a piece of light entertainment when sipping coffee, just focus on these three phase, containment, eradication and recovery, of the six step incident handling process. Feel free to apply your own incident response plans to this scenario and I don’t expect anyone to post their answers to the questions. This is simply something to warm up the brain after the weekend – or help those recover after the week that was SANSFire.
A very popular news web site is compromised and the front page is offering up known malware, AB, to any that visit it. You first discover this as the AV console frantically starts receiving notifications from client machines visiting the infected site. A quick bit of research reveals the malware AB exploits a vulnerability in only Internet Explorer 6 and then attempts to phone home uploading the compromised machine's IE protected storage details to any one of 30 drop web sites via http. If the malware infects the system, it then attempts to download, via FTP and https, a .exe file containing more malware designed to hunt over port TCP 445 for machines without patch MS08-067 (KB 958644) to drop a hidden .exe file on %SYSTEMROOT%/System32. The AV companies released a signature file to detect and protect against this three weeks ago.
You're the lone security person for a company of 5,000 employees, over 10 sites. The standard operating system is Windows XP with version of Internet Explorer from 6-8. The IT team use Microsoft’s System Center Configuration Manager to manage the Windows systems and deploy software and patches. You are the firewall and AV admin and the IT support staff are competent but over worked and under resourced. Two of the ten sites have no IT staff on site.
Over half your company, including all of senior management, visit that site daily to keep themselves informed or read the gossip of the day. From the IT team's best estimates at least 3000 machines have IE 6 and roughly 300 of those machines probably have don't have the right level of AV definitions on them to protect against it for any number of reasons. The news web site isn’t going to be able to remove the malware distribution for up to 12 hour. 10 server systems you know of don't have the MS08-067 patch due to operational issue with supporting from a 3rd party vendor but requires TCP 445 to be available to internal systems.
The AV console currently has 1200 alerts and growing by the minute.
- What do you do to contain this incident?
- How can you identify infected machine?
- What do you do with infected machines?
- How can you identify any other at risk machines?
- How can you protect the 10 servers without MS08-067?
- What information do you communicate to staff, IT and management?
Chris Mohan --- Internet Storm Center Handler on Duty