alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE BigLock Ransomware CnC Activity (gen)"; flow:established,to_server; content:"|0d 0a 0d 0a|gen="; fast_pattern; http.request_body; content:!"&syncID="; nocase; http.method; content:"POST"; http.uri; content:".php"; endswith; http.header_names; content:!"Referer"; content:!"Pragma"; content:!"Cache-"; reference:md5,ca9f28f5ae85fd014cbf07041117a735; classtype:command-and-control; sid:2030183; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_05_19, deployment Perimeter, deprecation_reason Age, malware_family Ransomware, malware_family BigLock, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_12_28, reviewed_at 2023_12_28, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)