Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/AnteFrigus Ransomware Activity"; flow:established,to_server; http.method; content:"GET"; http.uri; content:!"."; content:!"&"; content:!"?"; http.user_agent; content:"|20|Gb</br>"; endswith; http.header; content:"|20|Gb</br>|0d 0a|Host|3a 20|"; fast_pattern; http.header_names; content:!"Accept"; content:!"Cache"; content:!"Referer"; reference:md5,b34f1592bce63de77b87d1e61bce66e5; classtype:command-and-control; sid:2028966; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_11_13, deployment Perimeter, malware_family Win32_AnteFrigus, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_11_13, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)