ET MALWARE PackClient RAT Status Checkin Message - From Server

Query · suricata

flow:established,to_client;
content:"|40 5a 03 00 00 00|"; depth:8; fast_pattern;
byte_jump:2,0,from_beginning,little,post_offset 3;
isdataat:!2,relative;
target:dest_ip;
Raw source ET MALWARE PackClient RAT Status Checkin Message - From Server · 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 $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE PackClient RAT Status Checkin Message - From Server";
    flow:established,to_client;
    content:"|40 5a 03 00 00 00|"; depth:8; fast_pattern;
    byte_jump:2,0,from_beginning,little,post_offset 3;
    isdataat:!2,relative;
    reference:md5,c55f9bc3c53ac32e6169ad3cc8b2ce49;
    classtype:trojan-activity;
    sid:2069885; 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:dest_ip;
)

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