A variant of a common computer virus is the first to use code that?s scrambled to resist removal, forcing companies to delete the bug one computer at a time, a security researcher said.
The virus, called a "trojan," runs on a personal computer and receives instructions from other computers via the Internet. The software code is scrambled so the program only responds to instructions encrypted with a matching code, said Joe Stewart, a researcher at security firm Lurhq Corp. of Myrtle Beach, South Carolina.
So-called trojan programs operate when a computer user unintentionally downloads a file to his or her computer and the machine is restarted, activating the program contained in the file. The program studied by Stewart, Backdoor-BAM, was first reported by virus researchers in October.
http://www.detnews.com/2003/technology/0312/11/technology-4584.htm
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