ET MALWARE ClearFake CnC Checkin (POST)

Query · suricata

flow:established,to_server;
urilen:18;
http.method;
content:"POST";
http.uri;
content:"|2f|post|2e|php|3f|status|3d|"; startswith; fast_pattern;
pcre:"/^\x2fpost\x2ephp\x3fstatus\x3d\d$/";
content:!"|0d 0a|Referer|0d 0a|";
http.content_len; bsize:1;
content:"0";
http.content_type; bsize:33;
content:"application/x-www-form-urlencoded";
http.connection;
content:"Keep-Alive";
Raw source ET MALWARE ClearFake CnC Checkin (POST) · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE ClearFake CnC Checkin (POST)";
    flow:established,to_server;
    urilen:18;
    http.method;
    content:"POST";
    http.uri;
    content:"|2f|post|2e|php|3f|status|3d|"; startswith; fast_pattern;
    pcre:"/^\x2fpost\x2ephp\x3fstatus\x3d\d$/";
    content:!"|0d 0a|Referer|0d 0a|";
    http.content_len; bsize:1;
    content:"0";
    http.content_type; bsize:33;
    content:"application/x-www-form-urlencoded";
    http.connection;
    content:"Keep-Alive";
    reference:md5,b3b735852084909f82121fd6fbbdeb68;
    classtype:trojan-activity;
    sid:2053416; rev:1;
    metadata:attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2024_06_10, deployment Perimeter, deployment SSLDecrypt, malware_family ClearFake, confidence Medium, signature_severity Critical, tag c2, tag compromised_website, updated_at 2024_06_10, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
)

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