ET MALWARE implant.js Windows Beacon Check-in

Query · suricata

flow:established,to_server;
flowbits:isset,ET.implantjs.syn;
dsize:1;
content:"|c2|";
target:src_ip;

Rule dependencies

⚠ Higher-order rule. It fires on other rules' alerts, not on raw events, so it cannot fire on its own. Deploy the rules it depends on too.

Depends on

Raw source ET MALWARE implant.js Windows Beacon Check-in · Suricata
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Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE implant.js Windows Beacon Check-in";
    flow:established,to_server;
    flowbits:isset,ET.implantjs.syn;
    dsize:1;
    content:"|c2|";
    reference:url,github.com/captainGeech42/implant.js;
    reference:url,districtcon.org/bios-and-talks-2025/implantjs-modular-malware;
    classtype:trojan-activity;
    sid:2060256; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_02_21, deployment Perimeter, malware_family implant_js, performance_impact Moderate, confidence High, signature_severity Major, tag c2, updated_at 2026_05_21, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
    target:src_ip;
)

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