If it establishes a foothold anywhere in the network, it can even spread to systems that are patched with the MS08-067, if they are insecure in other areas, (i.e., it uses multiple attack methods).
Please take precautions now, as this one will be even more difficult than "B" was to clean.
Conficker.C Worm - Major Update targeted for April Fools Day
QUOTE: Just when you might have thought it was safe to start using USB flash drives at work again, the third, and by all accounts, most fiendish version of the Conficker worm that's infected millions of PCs already is set to attack on April 1st, Ars Technica reports. Conficker.C's designed to hide itself even more thoroughly than its older siblings Conficker.A and Conficker.B, using tricks such as:
• Inserting itself into as many as five Windows-related folders such as System, Movie Maker, Internet Explorer, and others (under a random name, of course)
• Creating access control entries and locking the file(s)
• Registers dummy services using a "one (name) from column A, one from column B, and two from column C" method
To find out what happens when Conficker.C strikes, join us after the jump.
Conficker.C's payload makes it harder than ever to recover from being infected:
• Deactivates Windows Security Center notifications
• Prevents restart in Safe Mode
• Prevents Windows Defender from running at system startup
• Deletes all system restore points
• Disables various error-reporting and security services
• Terminates over twenty security-related processes
• Blocks DNS queries
• Blocks access to security and antivirus websites
• And, to top it all off, Conficker.C can choose from a list of 500 domains to contact out of a pool of 50,000 (way up from Conficker.B's 32 out of 250).
Conficker.C - Detailed Evaluation by SRI
QUOTE: Variant C represents the third major revision of the Conficker malware family, which first appeared on the Internet on 20 November 2008. C distinguishes itself as a significant revision to Conficker B. In fact, we estimate that C leaves as little as 15% of the original B code base untouched
Below are some resources for information and cleaning tools for the Conficker worm:
Conficker - Cleaning tips for corporate users
Internet Storm Center - Conficker Resource Center
Conficker.c - April 1st payload still a mystery to researchers
QUOTE: PCs infected with Conficker.c, the third version of the worm that first appeared late last year, will use a new communication scheme on April 1 to establish a link to the command-and-control servers operated by the hackers who seeded the malware. The date is hard-coded into the worm, which in turn polls any of a number of major Web sites, including Yahoo, for the date, said Stewart.
"So far, we haven't seen any evidence [on those machines] of what it will do April 1," added Stewart, although that's to be expected. "It's not April 1 yet, so they're not going to put something online, where it might be found. In fact, it's almost a little risky for us to try to look for those sites, since it might give away that we have some bots in their network." Symantec Corp.'s Vincent Weafer, vice president of the company's security response group, agreed with Stewart that it's impossible to know ahead of time what stunt Conficker's controllers will pull next week. "Nobody has any real idea," said Weafer. "There's no indication of what it will do April 1."
Weafer characterized the Conficker.c update as one to "armor and harden the existing infections," and noted that the variant, unlike its predecessors, cannot spread to other PCs. "This variant is very defensive-oriented," said Weafer, "to make it less visible and more resilient." Like Weafer, Stewart sees Conficker.c as a move by the worm's maker or makers to consolidate what's already infected. "The big question is what's the end game?" he said. "Is it just as big as they want it to get?"
Edited by harrywaldron, 01 April 2009 - 12:09 PM.