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Stubborn trojan stashes install file in Windows help

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Security researchers have spied malware that stashes a copy of itself in a Windows help file to ensure victim computers remain infected.

The trojan, dubbed Muster.e by anti-virus provider McAfee, infects a Windows file called imepaden.hlp so it stores the main components of the malware in encrypted form. In the event the installed malware is removed, the secret payload is decrypted into an executable file called upgraderUI.exe and run by a companion installation file that automatically runs as a Windows service.

"This is hiding in plain sight," said Craig Schmugar, a threat researcher at McAfee Labs. "The help file trick is pretty new to us. Usually on the client, we don't see this very often."

The technique ensures Muster.e remains installed on an infected PC even if most of the files associated with the malware are removed. No doubt it's also perplexed its share of users who for the life of them can't figure out how their PCs keep getting reinfected.

McAfee has more here. ®

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