alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE CryptoLuck / YafunnLocker Ransomware CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php?id="; content:"&hi"; distance:0; http.user_agent; content:"Mozilla/5.0 (Windows NT 6.1)"; fast_pattern; bsize:28; http.request_body; content:"Content-Disposition|3a 20|form-data|3b 20|name=|22|"; http.header_names; content:!"Referer|0d 0a|"; reference:md5,59109839de42d2acb44fbd7ff151fe0c; classtype:command-and-control; sid:2023533; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_11_14, deployment Perimeter, malware_family Ransomware, malware_family YafunnLocker, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_03, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)