Another new Internet worm is spreading by exploiting a flaw in the Sasser worm. Tentatively named Dabber, it takes advantage of a vulnerability in an FTP server component in the Sasser worm and may have infected thousands of computers infected with Sasser. Dabber is believed to be the first worm that spreads specifically by targeting a flaw in another worm’s code, according to an advisory published by LURHQ. The worm uses code written to exploit the FTP flaw and was recently released on the Internet, scanning the Internet on port 5554 for computers running Windows and infected with Sasser, LURHQ said. When it finds vulnerable hosts, it connects to the victim and uses a built-in FTP server to transfer the worm file, named “package.exe”, to the system. When run, the Dabber worm installs itself on Windows, shuts down the Sasser worm and other worm processes, then prevents them from running again. Full Story
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