ET MALWARE APT.Fwits CnC Beacon M2

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"?---";
pcre:"/\?---[A-Z]$/";
http.header_names;
content:!"User-Agent|0d 0a|";
content:!"Accept";
content:!"Referer|0d 0a|";
Raw source ET MALWARE APT.Fwits CnC Beacon M2 · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE APT.Fwits CnC Beacon M2";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"?---";
    pcre:"/\?---[A-Z]$/";
    http.header_names;
    content:!"User-Agent|0d 0a|";
    content:!"Accept";
    content:!"Referer|0d 0a|";
    reference:md5,24d76abbc0a10e4c977a28b33c879248;
    reference:url,baesystemsai.blogspot.com/2016/04/two-bytes-to-951m.html;
    classtype:targeted-activity;
    sid:2022757; rev:3;
    metadata:attack_target Client_Endpoint, created_at 2016_04_25, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_07_07, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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