IDG News Service (27 May 2004)
The company posted a security advisory for W64.Rugrat.3344 on its Web page Thursday. The virus is rated low threat and does not appear to be spreading on the Internet, Symantec said. Instead, Rugrat is believed to be a "proof of concept" virus written by the same author of at least six other virus "firsts," Symantec said.
The virus infects Windows Portable Executable files, including many Windows 64 applications, spreading to files in the same folder as the virus file and in subfolders, Symantec said.
Rugrat does not appear to be designed to spread, but is a "direct-action infector," meaning it stops running immediately after infecting files, Symantec said.
Symantec researchers have linked Rugrat to a family of six viruses called W32.Chiton.gen, which are all believed to be the work of the same author. Each virus in the family demonstrates a different "first ever" infection technique, including W32.Shrug, the first known virus to use the Thread Local Storage structures in Windows NT, 2000 and XP to run virus code, and W32.Chthon, the first virus to run as a native application in Windows NT, 2000 and XP, Symantec said.