ET MALWARE PackClient RAT C2 Information Request - Client Response

Query · suricata

flow:established,to_server;
flowbits:isset,ET.PackClient_RAT.Infocheck;
content:"|40 5a 0b 00 00 00|"; depth:8; fast_pattern;
content:"Windows"; distance:0;
content:"|7c|S1|7c|iid|3d|"; distance:0;
byte_jump:2,0,from_beginning,little,post_offset 3;
isdataat:!2,relative;
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 PackClient RAT C2 Information Request - Client Response · 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 PackClient RAT C2 Information Request - Client Response";
    flow:established,to_server;
    flowbits:isset,ET.PackClient_RAT.Infocheck;
    content:"|40 5a 0b 00 00 00|"; depth:8; fast_pattern;
    content:"Windows"; distance:0;
    content:"|7c|S1|7c|iid|3d|"; distance:0;
    byte_jump:2,0,from_beginning,little,post_offset 3;
    isdataat:!2,relative;
    reference:md5,c55f9bc3c53ac32e6169ad3cc8b2ce49;
    classtype:trojan-activity;
    sid:2069889; rev:1;
    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 2026_06_10, deployment Perimeter, malware_family PackClient_RAT, performance_impact Low, confidence High, signature_severity Major, tag RAT, updated_at 2026_06_10;
    target:src_ip;
)

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