ET MALWARE implant.js CnC Handshake (HS_ACK)

Query · suricata

flow:established,to_client;
flowbits:isset,ET.implantjs.syn;
flowbits:set,ET.implantjs.ack;
dsize:2;
content:"|73 31|";
target:dest_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

Feeds into

  • 5 rules read ET.implantjs.ack · view all
Raw source ET MALWARE implant.js CnC Handshake (HS_ACK) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp-pkt $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE implant.js CnC Handshake (HS_ACK)";
    flow:established,to_client;
    flowbits:isset,ET.implantjs.syn;
    flowbits:set,ET.implantjs.ack;
    dsize:2;
    content:"|73 31|";
    reference:url,github.com/captainGeech42/implant.js;
    reference:url,districtcon.org/bios-and-talks-2025/implantjs-modular-malware;
    classtype:trojan-activity;
    sid:2060257; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Mac_OSX, affected_product Linux, affected_product Windows_11, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_02_21, deployment Perimeter, malware_family implant_js, performance_impact Low, 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 T1071, mitre_technique_name Application_Layer_Protocol;
    target:dest_ip;
)

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