alert tcp $EXTERNAL_NET 5050 -> $HOME_NET any (msg:"ET DELETED Yahoo IM successful logon"; flow:from_server,established; content:"YMSG"; nocase; depth:4; content:"|00 01|"; offset:10; depth:2; classtype:policy-violation; sid:2001253; rev:7; metadata:created_at 2010_07_30, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)