Win32/selfish.b and .c

[Zica]

Hello,

Somebody knows which method the virus win32/selfish.c uses to spread? How the virus arrives at the computer?
I cannot find any information about this in the antivirus page.
Thanks,

[Thankful]

From Symantec:
http://www.symantec.com/security_response/writeup.jsp?docid=2006-121209-3201-99&tabid=1