alert tcp $HOME_NET any -> $EXTERNAL_NET 5190 (msg:"ET CHAT ICQ Login"; flow:established,to_server; content:"|2A01|"; depth:2; content:"|00010001|"; offset:8; depth:4; classtype:policy-violation; sid:2001804; rev:6; metadata:created_at 2010_07_30, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_07;)