alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Parallax CnC Response Activity M9"; flow:established,to_client; content:"|a5 20 94 f5|"; depth:4; fast_pattern; content:"|6d 54 21|"; distance:1; within:3; flowbits:isset,ET.Parallax-9; reference:md5,1b3f8c92d5d1ace34fa4dc2dd80c3eb7; classtype:command-and-control; sid:2030039; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_04_25, deployment Perimeter, malware_family Parallax, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_25;)