alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Killav.CM Checkin M2"; dsize:<50; flow:to_server,established; content:"|04 00 00 00 00|"; startswith; content:"|00 00 7E 00 00 00 7E 00|"; distance:0; fast_pattern; content:"|00 00|"; endswith; classtype:trojan-activity; sid:2035694; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_03_31, deployment Perimeter, malware_family Win32_Killav_CM, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_14;)