Welcome to the Virus Encyclopedia of Panda Security.
Sobig.C is a worm that does not have any damaging effects, which spreads via e-mail and across networks. The message carrying this worm is easy to identify, as the body of the message is always: Please see the attached file.
Once it has infected a computer, Sobig.C looks for e-mail addresses in all the files it finds on the affected computer with the following extensions: TXT, EML, HTM, HTML, DBX and WAB. It then sends a copy of itself to all these addresses.
Sobig.C can also copy itself to the Startup directories in the computers connected to the same network as the affected computer.
Sobig.C is easy to recognize when it spreads via e-mail, as the message carrying the worm always has the following characteristics: