alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Iron/Maktub Locker Ransomware CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.request_body; content:"{|22|encry|22 3a 22|"; depth:10; fast_pattern; content:"|22|randk|22 3a 22|"; distance:0; content:"|22|guid|22 3a 22|"; distance:0; content:"|22|start|22 3a 22|"; distance:0; content:"|22|market|22 3a 22|"; distance:0; http.header_names; content:!"Referer"; reference:md5,1e60050db59e3d977d2a928fff3d34a6; reference:url,bartblaze.blogspot.com/2018/04/maktub-ransomware-possibly-rebranded-as.html; classtype:command-and-control; sid:2025486; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_04_12, deployment Perimeter, malware_family Iron_Locker, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_25, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)