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alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"ET TROJAN Suspicious User-Agent - Possible Trojan Downloader (-)"; flow:established,to_server; content:"|0d 0a|User-Agent\: -|0d 0a|"; nocase; classtype: trojan-activity; sid:2007880; rev:1;)

Added 2008-02-24 00:35:10 UTC

At our site I'm seeing a ton of alarms on a site "www.coolwebchat.com" at 216.75.63.79:80 -- I believe these are all legitimate chat room stuff.

A bad choice for a user agent string.

-- RegQuinton - 04 Apr 2008


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Topic revision: r2 - 2008-04-04 - RegQuinton
 
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