Virut Analysis and Snort Rule
Summary: Cisco Talos analyzed a Virut sample (MD5 e68c4b9428f41036b1cf890d93bdf390) that connects to irc.zief.pl:65520, falling back to proxim.ircgalaxy.pl, to reach its command and control server, then downloads executables from adx2.2288.org disguised with non-executable extensions. The virus appends about 20 kb of code to clean files, inserts a JMP instruction to its entry point, varies that entry point's offset, and uses garbage instructions and a different decryptor per infection; VirusBulletin ranked Virut the 5th most prevalent malware family in March 2009.
Bottom line: Virut had been circulating since roughly 2006 and was still releasing new variants three years later, ranked 5th most prevalent in March 2009 - a reminder that file-appending, polymorphic malware with a stable C2 domain can outlast the tools built to catch it.
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- Topics
- Malware
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