The persistent pest, which made a strong comeback last month in the form of the Klez.h variant, is now helping revive the Chernobyl virus, according to a new report from antivirus company Symantec.
The latest variant of the Klez worm sometimes chooses to hitch a ride on sensitive documents, resulting in victims' confidential information spreading with the malicious program, Russian antivirus firm Kaspersky Labs said Friday.
A bug in the code of the SirCam worm has prevented the malicious program from reactivating its payload, which would have deleted files on infected PCs Tuesday, according to antivirus company Sophos.
The worm is programmed to reinfect PCs set with the European date format on 16 October - and will roll a dice to decide if it will destroy data on infected PCs.
The SirCam worm is still spreading like wild fire in Australia, with a significant jump in reported infections since its inception just three months ago.
While the media was preoccupied with Code Red last weekend, a second major worm was making the rounds. SirCam didn't target the White House, nor did it capitalise on Microsoft's vulnerabilities, nor did it specifically target Outlook. Stealth was just what the virus writer wanted, and under the crush of Code Red's press coverage, that's what SirCam got. Now SirCam is the number one virus in the world.
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