alert tcp $HOME_NET any -> $EXTERNAL_NET 5050 (msg:"ET DELETED Yahoo Chat Signin Inside Webmail"; flow:established,to_server; content:"content-length|3a|"; nocase; depth:15; content:"<Ymsg Command=|22|550|22|"; nocase; reference:url,yahoo.com; classtype:policy-violation; sid:2007066; rev:4; metadata:created_at 2010_07_30, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)