alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Mermaid Ransomware Variant CnC Activity M3"; flow:established,to_server; http.method; content:"GET"; http.uri; bsize:>60; content:".php?"; content:"=ID:_"; distance:0; content:"___Key|3a|___"; distance:0; fast_pattern; http.header_names; bsize:22; content:"|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|"; classtype:command-and-control; sid:2029321; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_01_24, deployment Perimeter, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_01_24, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)