+10000 systems compromised via irc & im
Social Engineering Attacks via IRC and Instant Messaging
Release Date: March 19, 2002
Systems Affected
Systems running Internet Relay Chat (IRC) or Instant Messaging (IM) clients
Overview
The CERT/CC has received reports of social engineering attacks on users of Internet Relay Chat (IRC) and Instant Messaging (IM) services. Intruders trick unsuspecting users into downloading and executing malicious software, which allows the intruders to use the systems as attack platforms for launching distributed denial-of-service (DDoS) attacks. The reports to the CERT/CC indicate that tens of thousands of systems have recently been compromised in this manner.
http://www.cert.org/incident_notes/IN-2002-03.html