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VXers add rootkit tech to MyDoom and Bagle

Stealth code goes mainstream

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Virus writers have begun adding rootkit functionality as a component of commonplace malware such as MyDoom and Bagle. Rootkit technology is designed to hide the presence of malware on infected systems. Originally the technology featured only as a component of more sophisticated and exotic forms of malware. Now the technology has moved into the mainstream, anti-virus firm F-secure reports.

For example, Bagle-GE incorporates rootkit features designed to hide the processes and registry keys of another Trojan of the same family, Bagle-GF. The development has raised particular concerns because of strong links between Bagle and the operations of numerous botnets, networks of compromised Windows PCs that are often used to either distribute spam or attack other systems.

"There appear to be bugs in these new Bagles. But if the Bagle authors have seriously decided to turn their attention to upgrading their malware suite with rootkits, then this first step appears to be a dangerous one and one worth keeping an eye on," F-Secure's techies comment in a posting on the firm's weblog here.

Gurong-A, a new worm based on MyDoom code - possibly created by a copycat author with access to leaked copies of MyDoon's source code - which also features rootkit (stealth) technology designed to help malware to avoid detection by conventional anti-virus scanners.

"Rootkit development has had such a lull in recent months that we were beginning to wonder if the technique had suddenly become passé. The last few days may have changed our opinion," F-Secure said. ®

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