alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET RETIRED Win32.Cerberus RAT Checkin Response"; flow:established,to_client; content:"Ypmw1Syv023QZD"; depth:30; reference:md5,76e084e9420bfaa31c0f0bf000f1c301; classtype:command-and-control; sid:2013772; rev:3; metadata:created_at 2011_10_14, former_category MALWARE, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_12_03;)