Some of you might remember GpCode, a Trojan horse that taunted users last summer by encrypting files and demanding that victims pay a ransom to get back their file access (see Blackmailing malware storms Russia). According to Russian antivirus firm Kaspersky Lab, the culprits appear to be at it again.
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The Kaspersky blog noted that some users are reporting that their documents, photos, archive files and more had turned into a bunch of junk data, and a file called read_me.txt had appeared on their systems. Sadly, the blog noted, the contents of this file were all too familiar:
“Hello, your files are encrypted with RSA-4096 algorithm (http://en.wikipedia.org/wiki/RSA). You will need at least [a] few years to decrypt these files without our software. All your private information for last 3 months were collected and sent to us. To decrypt your files you need to buy our software. The price is $300 …”
Kaspersky analyzed the files and found that despite the claims, there’s no sign of RSA-4096. “Interestingly, this nasty little piece of work, which we detect as Virus.Win32.Gpcode.ai, has a very limited shelf life, from 10th to 15th July 2007. Why? We can only guess.”