MSN Messenger has been added to the list of instant messenger programs which require heightened vigilence. Two security companies have discovered that there are two worms, one old and revised, and one new, which are targetting MSN Messenger users. As if we don’t have enough to worry about with phishers targetting Yahoo Messenger, and a security hole in Trillian.

The first is a variation on the Kelvir worm (Win32.Kelvir.a), and the latter is a brand new worm which as been dubbed by security company Aladdin Knowledge Systems “Win32.Serflog.a”, and which F-Secure is calling Sumom. Both worms are considered to be medium-to-high risk.

The Kelvir worm spreads itself by…

[Two Internet Worms Target MSN Instant Messenger Users, Continued]