ET MALWARE APT Lurker POST CnC Beacon

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:".php"; fast_pattern;
pcre:"/\.php$/";
http.header;
content:"HOST|3a|"; depth:5;
content:"User-Agent|3a|"; distance:0;
pcre:"/^Host\x3a[^\r\n]+\r\nUser-Agent\x3a[^\r\n]+\r\nContent-Length\x3a\x20\d+\r\n(?:\r\n)?$/mi";
http.header_names;
content:!"Content-Type|0d 0a|";
content:!"Accept";
content:!"Referer|0d 0a|";
Raw source ET MALWARE APT Lurker POST CnC Beacon · 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 -> $EXTERNAL_NET 443 (
    msg:"ET MALWARE APT Lurker POST CnC Beacon";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".php"; fast_pattern;
    pcre:"/\.php$/";
    http.header;
    content:"HOST|3a|"; depth:5;
    content:"User-Agent|3a|"; distance:0;
    pcre:"/^Host\x3a[^\r\n]+\r\nUser-Agent\x3a[^\r\n]+\r\nContent-Length\x3a\x20\d+\r\n(?:\r\n)?$/mi";
    http.header_names;
    content:!"Content-Type|0d 0a|";
    content:!"Accept";
    content:!"Referer|0d 0a|";
    reference:md5,c5a8e09295b852a6e32186374b66e1a7;
    reference:url,blogs.rsa.com/wp-content/uploads/2015/05/RSA-IR-Case-Study.pdf;
    classtype:targeted-activity;
    sid:2021584; rev:7;
    metadata:attack_target Client_Endpoint, created_at 2015_08_03, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_11_19, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.