alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET CHAT MSN status change"; flow:established,to_server; content:"CHG "; depth:55; classtype:policy-violation; sid:2002192; rev:4; metadata:created_at 2010_07_30, deprecation_reason Relevance, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)