ET MALWARE Cobalt Strike Beacon Activity (Wordpress Profile)

Query · suricata

flow:established,to_server;
http.uri;
content:"/ny.js"; bsize:6; fast_pattern;
http.cookie;
content:"wordpress_logged_in="; startswith;
pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R";
http.header_names;
content:!"Referer";
Raw source ET MALWARE Cobalt Strike Beacon Activity (Wordpress Profile) · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Cobalt Strike Beacon Activity (Wordpress Profile)";
    flow:established,to_server;
    http.uri;
    content:"/ny.js"; bsize:6; fast_pattern;
    http.cookie;
    content:"wordpress_logged_in="; startswith;
    pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R";
    http.header_names;
    content:!"Referer";
    reference:md5,93b24d6de3e38fe3112554355a1ba98f;
    reference:url,twitter.com/_brettfitz/status/1404095220506103812;
    classtype:command-and-control;
    sid:2033143; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2021_06_15, deployment Perimeter, malware_family Cobalt_Strike, confidence Medium, signature_severity Major, updated_at 2021_06_15, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;
)

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