snort rules for ICQ http/https tunnels

From: Alexander Antipov (antipov_at_SecurityLab.ru)
Date: 02/24/04

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    To: <full-disclosure@lists.netsys.com>
Date: Tue, 24 Feb 2004 18:09:55 +0300

    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;)

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