alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE NanoCore RAT CnC 27"; flow:to_server,established; dsize:68; content:"|40 00 00 00 fe 31 80 44 e7 eb 4a 77|"; depth:12; reference:md5,aa73e99d7e1d62265f75ccc0443a1a7f; classtype:command-and-control; sid:2029996; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_04_23, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_28;)