ET RETIRED Win32/Gh0st RAT Variant CnC Checkin response

Query · suricata

flow:established,to_client;
stream_size:server,=,28;
dsize:27;
content:"|1b 00 00 00|"; startswith;
pcre:"/^(?:[0-9]\x00){9}/R";
pcre:"/(?:\x01\x00\x01$|\x00{3}$)/";
byte_jump:4,0, little, from_beginning, post_offset -1;
isdataat:!2,relative;
Raw source ET RETIRED Win32/Gh0st RAT Variant CnC Checkin response · 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 -> $HOME_NET any (
    msg:"ET RETIRED Win32/Gh0st RAT Variant CnC Checkin response";
    flow:established,to_client;
    stream_size:server,=,28;
    dsize:27;
    content:"|1b 00 00 00|"; startswith;
    pcre:"/^(?:[0-9]\x00){9}/R";
    pcre:"/(?:\x01\x00\x01$|\x00{3}$)/";
    byte_jump:4,0, little, from_beginning, post_offset -1;
    isdataat:!2,relative;
    reference:md5,77bd9926a4b41c14259e20c1f90e22aa;
    classtype:trojan-activity;
    sid:2039834; rev:3;
    metadata:attack_target Client_and_Server, created_at 2022_11_23, deployment Perimeter, former_category MALWARE, malware_family Win32_Gh0st, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_09_23, reviewed_at 2024_09_23;
)

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