ET MALWARE Manjusaka C2 Heartbeat Response

Query · suricata

flow:established,to_client;
http.stat_code;
content:"200";
http.content_type;
content:"image/png";
http.content_len;
content:"5"; bsize:1;
http.response_body;
content:"|1a 1a 6e 04 29|"; fast_pattern; bsize:5;
threshold:type limit, seconds 360, count 1, track by_dst;
Raw source ET MALWARE Manjusaka C2 Heartbeat Response · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE Manjusaka C2 Heartbeat Response";
    flow:established,to_client;
    http.stat_code;
    content:"200";
    http.content_type;
    content:"image/png";
    http.content_len;
    content:"5"; bsize:1;
    http.response_body;
    content:"|1a 1a 6e 04 29|"; fast_pattern; bsize:5;
    threshold:type limit, seconds 360, count 1, track by_dst;
    reference:url,corelight.com/blog/detecting-manjusaka-c2-framework;
    classtype:command-and-control;
    sid:2039602; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_10_31, deployment Perimeter, deployment SSLDecrypt, malware_family Manjusaka, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_10_31, reviewed_at 2025_10_24;
)

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