ET MALWARE Win32/LockScreen CnC Beacon 2

Query · suricata

flow:established,to_server;
urilen:8;
http.method;
content:"GET";
http.uri;
content:"/cou.php"; fast_pattern;
http.header;
content:"Host|3a|"; depth:5;
pcre:"/^Host\x3a[^\r\n]+\r\n(?:\r\n)?$/";
http.header_names;
content:!"User-Agent|0d 0a|";
content:!"Accept";
content:!"Referer|0d 0a|";
Raw source ET MALWARE Win32/LockScreen CnC Beacon 2 · Suricata
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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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/LockScreen CnC Beacon 2";
    flow:established,to_server;
    urilen:8;
    http.method;
    content:"GET";
    http.uri;
    content:"/cou.php"; fast_pattern;
    http.header;
    content:"Host|3a|"; depth:5;
    pcre:"/^Host\x3a[^\r\n]+\r\n(?:\r\n)?$/";
    http.header_names;
    content:!"User-Agent|0d 0a|";
    content:!"Accept";
    content:!"Referer|0d 0a|";
    reference:md5,046e4b3ff7b323f2147f2d5d43b7e5f4;
    reference:md5,e4ab12da8828a7f1e6c077a2999f8320;
    classtype:command-and-control;
    sid:2020504; rev:4;
    metadata:attack_target Client_Endpoint, created_at 2015_02_24, deployment Perimeter, malware_family Win32_LockScreen, signature_severity Major, tag c2, updated_at 2020_09_29, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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