http://www.computerworld.com/action/article.do?command=viewArticleBasic&taxonomyName=security&articleId=9027160 By Gregg Keizer July 16, 2007 Computerworld "Ransomware" last seen in 2006 has reappeared and is trying to extort $300 from users whose files the malware has encrypted, a Russian security researcher said today. GpCode, a Trojan horse which last made a run at users last summer, has popped up again, said Aleks Gostev, senior virus analyst with Moscow-based Kaspersky Lab Inc., in a posting to the research center's blog. Noting the long quiet time, Gostev added: "So you can imagine our feelings this weekend, when some of our non-Russian users told us their documents, photos, archive files etc. had turned into a bunch of junk data, and a file called 'read_me.txt' had appeared on their systems." The text file contained the "ransom" note. "Hello, your files are encrypted with RSA-4096 algorithm. You will need at least 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." So-called ransomware typically follows the GpCode pattern: malware sneaks onto a PC, encrypts files, and then displays a message demanding money to unlock the data. Gostev hinted that the blackmailer was likely Russian. "The e-mail address is one that we've seen before in LdPinch and Banker [Trojan horse] variants, programs which were clearly of Russian origin," he said. The blackmailer's claim that the files were enciphered with RSA-4096 -- the RSA algorithm locked with a 4,096-bit key -- is bogus, said Gostev. Another oddity, he added, was that the Trojan has a limited shelf life: from July 10 to July 15. "Why? We can only guess," said Gostev. Kaspersky is working on a decryption scheme to recover the files; that process has been the usual salvation -- and solution -- for users attacked by ransomware. "[But] we'd just like to remind you, if you've fallen victim to any type of ransomware, you should never pay up under any circumstances. "Contact your anti-virus provider, and make sure you back up your data on a regular basis." _____________________________________________________ Attend Black Hat USA, July 28-August 2 in Las Vegas, the world's premier technical event for ICT security experts. Featuring 30 hands-on training courses and 90 Briefings presentations with lots of new content and new tools. Network with 4,000 delegates from 70 nations. Visit product displays by 30 top sponsors in a relaxed setting. Rates increase on June 1 so register today. http://www.blackhat.com
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