Hybrids seem to be all the rage in the automobile industry, so it’s unsurprising that hybrid threats are the new thing in another industry that reliably ships updated product lines: The computer crime world. The public release of the source code for the infamous ZeuS Trojan earlier this year is spawning novel attack tools. And just as hybrid cars hold the promise of greater fuel efficiency, these nascent threats show the potential of the ZeuS source code leak for morphing ordinary, run-of-the-mill malware into far more efficient data-stealing machines.
Researchers at Trusteer have unearthed evidence that portions of the leaked ZeuS source code have been fused with recent versions of Ramnit, a computer worm first spotted in January 2010. Amid thousands of other password-stealing, file-infecting worms capable of spreading via networked drives, Ramnit is unremarkable except in one respect: It is hugely prolific. According to a report (PDF) from Symantec, Ramnit accounted for 17.3 percent of all malicious software that the company detected in July 2011.