Hi!
From KasperskyLab: 'Bizex' worm attacks ICQ users -
http://www.kaspersky.com/news.html?id=4272424

Rules for snort to deny ICQ via proxy and proxy chains: (more
information can be found here http://securitylab.ru/40960.html):

# icq.rules
# snort rules for ICQ http/https tunnels
# (c)ded by asu4ka 2003.
# v 0.0.0.1

var PR_IP x.x.x.x
var PR_TCP 8080

alert tcp any any -> $PR_IP $PR_TCP (msg: "ICQ HTTPS/HTTP _basic_,
mf!";\
flow: to_server, established; content: "ICQBasic";)

alert tcp any any -> $PR_IP $PR_TCP (msg: "ICQ HTTPS _key_, mf!";\
flow: to_server, established; content: "<key>"; content: "</key>";
nocase;)

alert tcp $PR_IP $PR_TCP -> any any (msg: "ICQ HTTP _aim/http_, mf!";\
flow: from_server,established; content: "AIM/HTTP"; nocase;)

[ reply ]