ESET and BitDefender researchers have discovered malicious worm that disguises itself as IQ test. So far, two variants, Win32/Zimuse.A and Win32/Zimuse.B, have been seen.
"Upon execution, the malware will attempt to spread through removable media using a time-based logic bomb, and overwrite the MBR (Master Boot Record) of all available drives after 40 days for variant A, and 20 days for variant B, making the host’s data inaccessible."
Since 64 bit versions of Windows Vista and Windows 7 require digitally signed drivers the pest fails to install itself on machine with either of these operating systems installed.
Both BitDefender and ESET have Zimuse removal tool available.
More information:
BitDefender blog entry
ESET press release
Source
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