ET MALWARE Manjusaka C2 Client Heartbeat

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/global/favicon.png"; bsize:19; fast_pattern;
http.content_len;
content:"2"; bsize:1;
http.user_agent;
content:"Mozilla|2f|5|2e|0|20 28|Windows|20|NT|20|8|2e|0|3b 20|WOW64|3b 20|rv|3a|"; startswith;
http.request_body;
content:"|19 1a|"; bsize:2;
threshold:type limit, seconds 360, count 1, track by_src;
Raw source ET MALWARE Manjusaka C2 Client Heartbeat · 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 Manjusaka C2 Client Heartbeat";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/global/favicon.png"; bsize:19; fast_pattern;
    http.content_len;
    content:"2"; bsize:1;
    http.user_agent;
    content:"Mozilla|2f|5|2e|0|20 28|Windows|20|NT|20|8|2e|0|3b 20|WOW64|3b 20|rv|3a|"; startswith;
    http.request_body;
    content:"|19 1a|"; bsize:2;
    threshold:type limit, seconds 360, count 1, track by_src;
    reference:url,corelight.com/blog/detecting-manjusaka-c2-framework;
    classtype:command-and-control;
    sid:2039601; 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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