alert tcp $EXTERNAL_NET 5050 -> $HOME_NET any (msg:"GPL CHAT Yahoo IM successful chat join"; flow:from_server,established; content:"YMSG"; depth:4; nocase; content:"|00 98|"; depth:2; offset:10; classtype:policy-violation; sid:2102458; rev:5; metadata:created_at 2010_09_23, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)