Researchers at anti-virus firm BitDefender said this week they have identified a new variant of the Conficker worm. The new variant, which is similar to previous versions, can evade detection and disinfection by tools that have been created to deter the threat. It also can block access to websites of anti-virus vendors, as well as third parties offering online scanning services or removal tools. In addition, the primary obfuscation layer has been rewritten to prevent detection. — CAM