alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MSIL/Runsome Ransomware CnC Checkin"; flow:established,to_server; http.uri; content:".php?name="; content:"&key=ENC"; distance:0; fast_pattern; http.header_names; content:"|0d 0a|Host|0d 0a|"; startswith; content:!"User-Agent|0d 0a|"; content:!"Accept"; content:!"Referer|0d 0a|"; reference:md5,70c27926e54732a579b0004ede566fc6; reference:url,github.com/ShaneNolan/Runsome; classtype:command-and-control; sid:2024223; rev:6; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_04_19, deployment Perimeter, malware_family Ransomware, malware_family Runsome, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_14, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)