Just days before the Conficker worm is set to contact its controllers for new instructions, security researchers have discovered a flaw in the worm that makes it much easier for users to detect infected PCs.

Tillmann Werner and Felix Leder, members of the Honeynet Project, an all-volunteer organization that monitors Internet threats, have discovered that Conficker-infected PCs return unusual errors when sent specially crafted Remote Procedure Call (RPC) messages, according to preliminary information they have posted on the Web.

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