alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Win32.Cerberus RAT Server ping"; flow:from_server,established; content:"wBmpf3Pb7RJe|0d0a|"; depth:14; dsize:14; reference:md5,76e084e9420bfaa31c0f0bf000f1c301; classtype:trojan-activity; sid:2013774; rev:2; metadata:created_at 2011_10_14, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)