ET MALWARE Win32/Farfli.CUY CnC Server Response

Query · suricata

flow:established,to_client;
content:"|68 78 20 10 00 00 00 01 00 00 00 01 00 00 00 11|";
dsize:16; startswith; fast_pattern;
stream_size:server,=,17;
Raw source ET MALWARE Win32/Farfli.CUY CnC Server 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 $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE Win32/Farfli.CUY CnC Server Response";
    flow:established,to_client;
    content:"|68 78 20 10 00 00 00 01 00 00 00 01 00 00 00 11|";
    dsize:16; startswith; fast_pattern;
    stream_size:server,=,17;
    reference:md5,c99397d66e49e2def1b17f57cd0c5fb9;
    classtype:command-and-control;
    sid:2035879; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_04_08, deployment Perimeter, malware_family Win32_Farfli_CUY, confidence High, signature_severity Major, tag c2, updated_at 2022_04_08, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)

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