alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Nemty Ransomware CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?data="; pcre:"/^[A-Za-z0-9\/\.=]{250,}$/R"; http.user_agent; content:"Naruto Uzumake"; fast_pattern; http.header_names; content:!"Referer"; content:!"Accept"; reference:md5,227bd2d9b55951828ebaed09ea561311; classtype:command-and-control; sid:2029290; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_01_17, deployment Perimeter, malware_family Nemty, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_01_17, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)