ET MALWARE Backdoor family PCRat/Gh0st CnC traffic (OUTBOUND) 109

Query · suricata

flow:established,to_server;
app-layer-protocol:!tls;
stream_size:server,<,5;
dsize:<250;
content:"|00 00 01 78 9c|"; offset:10; depth:5; fast_pattern;
byte_jump:2,0,little,from_beginning, post_offset 3;
isdataat:!2,relative;
pcre:"/^(?<len>.{2})\xc0\xff(?P=len)\x00\x00.{2}\x00\x00\x01\x78\x9c/s";
Raw source ET MALWARE Backdoor family PCRat/Gh0st CnC traffic (OUTBOUND) 109 · Suricata
Esc
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 MALWARE Backdoor family PCRat/Gh0st CnC traffic (OUTBOUND) 109";
    flow:established,to_server;
    app-layer-protocol:!tls;
    stream_size:server,<,5;
    dsize:<250;
    content:"|00 00 01 78 9c|"; offset:10; depth:5; fast_pattern;
    byte_jump:2,0,little,from_beginning, post_offset 3;
    isdataat:!2,relative;
    pcre:"/^(?<len>.{2})\xc0\xff(?P=len)\x00\x00.{2}\x00\x00\x01\x78\x9c/s";
    reference:md5,edacdc76bb11e8db5c1a1b8917b5deb0;
    classtype:command-and-control;
    sid:2034977; rev:2;
    metadata:attack_target Client_Endpoint, tls_state plaintext, created_at 2022_01_26, deployment Perimeter, malware_family Gh0st, performance_impact Moderate, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_07_03;
)

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