ET RETIRED Win32/Unknown RAT CnC Checkin

Query · suricata

flow:established,to_server;
stream_size:client,>,600;
content:"|29 01 00 00|"; startswith; fast_pattern;
byte_jump:4,0,relative,little,from_beginning,post_offset -1;
isdataat:!2,relative;
target:src_ip;
Raw source ET RETIRED Win32/Unknown RAT CnC Checkin · 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 $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET RETIRED Win32/Unknown RAT CnC Checkin";
    flow:established,to_server;
    stream_size:client,>,600;
    content:"|29 01 00 00|"; startswith; fast_pattern;
    byte_jump:4,0,relative,little,from_beginning,post_offset -1;
    isdataat:!2,relative;
    reference:md5,324877533d7f0c4014e0f046d0c28d39;
    reference:md5,dd43c6237024d7867e5e441871c64402;
    classtype:trojan-activity;
    sid:2049152; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_and_Server, created_at 2023_11_10, deployment Perimeter, former_category MALWARE, performance_impact Low, confidence High, signature_severity Major, updated_at 2025_04_17, reviewed_at 2025_04_17;
    target:src_ip;
)

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