ET MALWARE BigLock Ransomware CnC Activity (info)

Query · suricata

flow:established,to_server;
content:"|0d 0a|Content-Length|3a 20|6|0d 0a 0d 0a|info=1"; fast_pattern;
http.method;
content:"POST";
http.uri;
content:".php"; endswith;
http.header_names;
content:!"Referer";
content:!"Pragma";
content:!"Cache-";
Raw source ET MALWARE BigLock Ransomware CnC Activity (info) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE BigLock Ransomware CnC Activity (info)";
    flow:established,to_server;
    content:"|0d 0a|Content-Length|3a 20|6|0d 0a 0d 0a|info=1"; fast_pattern;
    http.method;
    content:"POST";
    http.uri;
    content:".php"; endswith;
    http.header_names;
    content:!"Referer";
    content:!"Pragma";
    content:!"Cache-";
    reference:md5,ca9f28f5ae85fd014cbf07041117a735;
    classtype:command-and-control;
    sid:2030182; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_05_19, deployment Perimeter, malware_family Ransomware, malware_family BigLock, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_05_19, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;
)

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