ET MALWARE Cobalt Strike Related Activity (GET)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/chunky/"; fast_pattern;
pcre:"/^[A-Za-z0-9-_]{176}\//R";
content:".gif"; endswith;
http.header_names;
content:!"Referer";
target:src_ip;
Raw source ET MALWARE Cobalt Strike Related Activity (GET) · 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 Related Activity (GET)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/chunky/"; fast_pattern;
    pcre:"/^[A-Za-z0-9-_]{176}\//R";
    content:".gif"; endswith;
    http.header_names;
    content:!"Referer";
    reference:md5,1cb5a9c2bc4adfe101f6069d525ba9b2;
    reference:url,twitter.com/malware_traffic/status/1600933614531010561;
    classtype:trojan-activity;
    sid:2042538; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2022_12_09, deployment Perimeter, deployment SSLDecrypt, malware_family Cobalt_Strike, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_12_09;
    target:src_ip;
)

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.