alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Spectre Ransomware CnC Checkin"; flow:established,to_server; http.uri; content:".php?mode="; content:"&crypted="; distance:0; content:"&id="; distance:0; http.header; content:"User-Agent|3a 20|Mozilla/4.0|0d 0a|"; fast_pattern; http.header_names; content:!"|0d 0a|Accept"; content:!"|0d 0a|Referer|0d 0a|"; reference:md5,e8af7ef13b6ced37d08dce0f747d7d8b; classtype:command-and-control; sid:2024373; rev:5; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_06_09, deployment Perimeter, malware_family Ransomware, malware_family Spectre, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_29, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)