I was aware of this a couple of days ago but just noticed that some members from DtK are starting to be caught out by this virus.
You will get a message from someone on your friends list and it will link you to a website which tries to load up favicon.ico (i think) and then spams your friends list.
Message looks like:
Sunday, 16 November 2014
Ťerminat0r™ (HIJACKED): WTF Dude?
Ťerminat0r™ (HIJACKED): screen-pictrues link (purposely misspelled & not linked)
More info here:
https://steamcommunity.com/app/22110...4858765191745/
Basically, just dont click the link.
Cheers.