ET MALWARE Cobalt Strike Malleable C2 Beacon (Custom)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/image-directory/dz.png"; fast_pattern; bsize:23;
http.user_agent;
content:"Mozilla/5.0|20 28|Linux|3b 20|Android 6.0|3b 20|HTC One X10 Build/MRA58K|3b 20|wv|29 20|AppleWebKit/537.36|20 28|KHTML, like Gecko|29 20|Version/4.0";
http.header_names;
content:!"Referer";
Raw source ET MALWARE Cobalt Strike Malleable C2 Beacon (Custom) · 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 Malleable C2 Beacon (Custom)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/image-directory/dz.png"; fast_pattern; bsize:23;
    http.user_agent;
    content:"Mozilla/5.0|20 28|Linux|3b 20|Android 6.0|3b 20|HTC One X10 Build/MRA58K|3b 20|wv|29 20|AppleWebKit/537.36|20 28|KHTML, like Gecko|29 20|Version/4.0";
    http.header_names;
    content:!"Referer";
    reference:url,isc.sans.edu/diary/rss/28884;
    reference:url,www.malware-traffic-analysis.net/2022/07/26/index.html;
    classtype:command-and-control;
    sid:2037844; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_07_28, deployment SSLDecrypt, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_07_28, reviewed_at 2024_09_17;
)

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