People that use IM’s…”instant messaging” programs like Windows Live Messenger (WLM), Yahoo, ICQ, AIM, etc. frequently get invitations from what appears to be friendly strangers, when in fact it’s an automated harvester (“bot”) seeking to infect your machine.

I’ll use WLM for this example because I use it myself for communicating with people in real time when I’m doing a remote assistance session.

You’ll see something like this in a pop up:

wlm

DO NOT allow that person (a bot in reality, not a live person) to communicate with you OR ADD them to your contact list. Check the “Block this person…” radio button.

Unless you know the person, AND you send them an invitation to join you in a chat, OR they tell you in an email that they’re going to invite you, DO NOT add anybody to your “buddy” list (I believe that’s the Yahoo term). Even if you recognize the name, DON’T add them unless they specifically tell you they’re going to contact you on an IM. That’s because spammers have the ability to “spoof” (fake) an IM from a trusted source.

So it’s best to pre-arrange these things so that you’ll know an invitation is coming.

This may seem like overkill, but IM’s are notorious for being vehicles of infections. One of the favorite tactics of malware writers is to hook you into adding them to your contact list and communicating with them, and then inserting a link to what you think is a .jpg picture, but in reality it could be a backdoor Trojan. The classic is “Click on this link to see a really neat pic”. Yeah…right!

DON’T DO IT!