BitDefender Labs has detected a new and more aggressive Downadup version on Saturday, 07.02.2009. It spreads using a Windows RPC Server Service vulnerability and is called Win32.Worm.Downadup.Gen.

The new version is more resilient to disinfection. Once the system is compromised, the worm disables Windows Update and blocks access to most of the anti-virus websites in order to hinder the user to disinfect his machine.

BitDefender is the first to offer a free tool which disinfects all versions of Downadup and is available for all infected users at: http://bdtools.net This domain is the first to serve a removal tool without being blocked by the e-threat.

The worm itself is not new, it made its first appearance late November 2008, known under the names Conficker or Kido as well exploiting the vulnerability described in the Microsoft security bulletin MS08-067. After successful exploitation it used to install rogue security software on the infected machine.

via Downadup Removal Tool – BitDefender.

Spread of Conficker worm - by Gppande via Wikipedia

Today, Microsoft Corp. announced a partnership with technology industry leaders and academia to implement a coordinated, global response to the Conficker (aka Downadup) worm. Together with security researchers, Internet Corporation for Assigned Names and Numbers (ICANN) and operators within the Domain Name System, Microsoft coordinated a response designed to disable domains atargeted by Conficker. Microsoft also announced a $250,000 reward for information that results in the arrest and conviction of those responsible for illegally launching the Conficker malicious code on the Internet.

“As part of Microsoft’s ongoing security efforts, we constantly look for ways to use a diverse set of tools and develop methodologies to protect our customers,” said George Stathakopoulos, general manager of the Trustworthy Computing Group at Microsoft. “By combining our expertise with that of the broader community we can expand the boundaries of defense to better protect people worldwide.”

As cyberthreats have rapidly evolved, a greater level of industry coordination and new tactics for communication and threat mitigation are required. To optimize the multiple initiatives being employed across the security industry and within academia, Microsoft helped unify these broad efforts to implement a community-based defense to disrupt the spread of Conficker.

Along with Microsoft, organizations involved in this collaborative effort include ICANN, NeuStar, VeriSign, CNNIC, Afilias, Public Internet Registry, Global Domains International Inc., M1D Global, AOL, Symantec, F-Secure, ISC, researchers from Georgia Tech, the Shadowserver Foundation, Arbor Networks and Support Intelligence.

“The best way to defeat potential botnets like Conficker/Downadup is by the security and Domain Name System communities working together,” said Greg Rattray, chief Internet security advisor at ICANN. “ICANN represents a community that’s all about coordinating those kinds of efforts to keep the Internet globally secure and stable.”

“Microsoft’s approach combines technology innovation and effective cross- sector partnerships to help protect people from cybercriminals,” Stathakopoulos said. “We hope these efforts help to contain the threat posed by Conficker, as well as hold those who illegally launch malware accountable.”

More information about how to protect yourself from Conficker can be found at http://www.microsoft.com/conficker