The malware researchers from anti-virus vendor Bitdefender have identified a new variant of the infamous Conficker worm. Its analysis has revealed an improved obfuscation layer and additional blocked strings.

Conficker, also known as Downadup or Kido, is one of the most complex and well-written pieces of malware that security researchers have seen in recent years. The original variant, Conficker.A, appeared back in November 2008, soon after Microsoft broke its patch cycle in order to release MS08-067, a fix for the critical remote code execution vulnerability in the Services service that the worm exploits in order to spread.

December 2008 saw the release of Conficker.B, the most successful variant to date, which infected an estimated number of 12 million computers at its peak. This was followed by another seriously revamped version, initially dubbed Conficker.B++. Security experts speculated that this update aimed at combating the efforts of the Conficker Cabal, a coalition of industry organizations and companies collaborating to fight the worm. Conficker.B++ is currently better known as Conficker.C.

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