hunters have discovered a new Trojan that encrypts files on an infected computer and then demands $300 in ransom for a decryption password.

The Trojan, identified as Cryzip, uses a commercial zip library to store the victim’s documents inside a password-protected zip file and leaves step-by-step instructions on how to pay the ransom to retrieve the files.

It is not yet clear how the Trojan is being distributed, but researchers say it was part of a small e-mail spam run that successfully evaded anti-virus scanners by staying below the radar.


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