ET MALWARE Win32/STEALBIT Data Exfiltration Tool Activity (PUT)

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/STEALBIT Data Exfiltration Tool Activity (PUT)";
    flow:established,to_server;
    http.uri;
    pcre:"/^\/[A-F0-9]{33}$/";
    http.method;
    content:"PUT";
    http.request_body;
    content:"DAV2"; depth:10; fast_pattern;
    http.header_names;
    content:!"Referer|0d 0a|";
    reference:url,yoroi.company/research/hunting-the-lockbit-gangs-exfiltration-infrastructures/;
    reference:url,www.cybereason.com/blog/research/threat-analysis-report-inside-the-lockbit-arsenal-the-stealbit-exfiltration-tool;
    classtype:trojan-activity;
    sid:2036280; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2022_04_20, deployment Perimeter, malware_family Win32_STEALBIT, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_30;
)