ET MALWARE APT Lurker GET CnC Beacon

Query · suricata

flow:established,to_server;
content:"GET /"; depth:5;
content:".php HTTP/1."; distance:0; fast_pattern;
content:!"Accept"; distance:0;
content:!"Referer|3a|"; distance:0;
content:"HOST|3a|"; distance:3; within:5;
pcre:"/^[^\r\n]+\r\nUser-Agent\x3a[^\r\n]+\r\n(?:\r\n)?$/Rmi";
Raw source ET MALWARE APT Lurker GET 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 tcp $HOME_NET any -> $EXTERNAL_NET 443 (
    msg:"ET MALWARE APT Lurker GET CnC Beacon";
    flow:established,to_server;
    content:"GET /"; depth:5;
    content:".php HTTP/1."; distance:0; fast_pattern;
    content:!"Accept"; distance:0;
    content:!"Referer|3a|"; distance:0;
    content:"HOST|3a|"; distance:3; within:5;
    pcre:"/^[^\r\n]+\r\nUser-Agent\x3a[^\r\n]+\r\n(?:\r\n)?$/Rmi";
    reference:md5,c5a8e09295b852a6e32186374b66e1a7;
    reference:url,blogs.rsa.com/wp-content/uploads/2015/05/RSA-IR-Case-Study.pdf;
    classtype:targeted-activity;
    sid:2021585; rev:3;
    metadata:attack_target Client_Endpoint, created_at 2015_08_03, deployment Perimeter, signature_severity Major, tag c2, updated_at 2019_07_26, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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