alert tcp $HOME_NET any <> $EXTERNAL_NET any (msg:"ET CHAT ICQ Message"; flow:established; content:"|2A02|"; depth:2; content:"|000400060000|"; offset:6; depth:6; classtype:policy-violation; sid:2001805; rev:5; metadata:created_at 2010_07_30, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)