Microsoft Windows Server RPC bug finds new way to spread

Share this article:
Exploits taking advantage of a Windows Server Service vulnerability still are running rampant, nearly 1-1/2 months after Microsoft delivered an emergency fix, researchers said Friday.

Symantec, over the holidays, spotted another round of infections in the form of a worm known as W32.Downadup. Microsoft is terming the malware Win32/Conficker.

The latest variant finds a new way to take advantage of the highly critical bug, which involves the Remote Procedure Call (RPC) protocol, Symantec researchers said on Friday. In prior attacks, an attacker could execute remote code by sending a specially crafted RPC request.

However, the new exploit "can also spread through corporate networks by infecting USB sticks and accessing weak passwords," Symantec's Security Response department said Friday in a forum post.

"W32.Downadup.B creates an autorun.inf file on all mapped drives so that the threat automatically executes when the drive is accessed," according to Symantec. "The threat then monitors for drives that are connected to the compromised computer in order to create an autorun.inf file as soon as the drive becomes accessible."

On Oct. 23, Microsoft delivered a rare, out-of-cycle patch for the flaw, which was being actively exploited in targeted attacks.

Matt McCormack of the company's Malware Protection Center wrote on Dec. 31 that researchers have detected a new outbreak of the attack, mostly on machines that have yet to apply the patch.
Share this article:
You must be a registered member of SC Magazine to post a comment.

Sign up to our newsletters

TOP COMMENTS

More in News

Hackers grab email addresses of CurrentC pilot participants

Hackers grab email addresses of CurrentC pilot participants

Although the hack didn't breach the mobile payment app itself, consumer confidence may be shaken.

Operators disable firewall features to increase network performance, survey finds

Operators disable firewall features to increase network performance, ...

McAfee found that 60 percent of 504 surveyed IT professionals prioritize security as the primary driver of network design.

PCI publishes guidance on security awareness programs

PCI publishes guidance on security awareness programs

The guidance, developed by a PCI Special Interest Group, will help merchants educate staff on protecting cardholder data.