alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Parallax CnC Response Activity M8"; flow:established,to_client; content:"|7a 3e 71 73|"; depth:4; fast_pattern; content:"|cf 46 80|"; distance:1; within:3; flowbits:isset,ET.Parallax-8; reference:md5,b92a8d983864505cfb74ad9c70b3ca48; classtype:command-and-control; sid:2029815; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_04_06, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_06;)