ET MALWARE DcRAT/Sheet RAT CnC Checkin Using MessagePack

Query · suricata

flow:established,to_server;
byte_jump:4,0,little,from_beginning, post_offset 3;
isdataat:!2,relative;
content:"|1f 8b 08|"; offset:8; depth:3; fast_pattern;
target:src_ip;
Raw source ET MALWARE DcRAT/Sheet RAT CnC Checkin Using MessagePack · 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 DcRAT/Sheet RAT CnC Checkin Using MessagePack";
    flow:established,to_server;
    byte_jump:4,0,little,from_beginning, post_offset 3;
    isdataat:!2,relative;
    content:"|1f 8b 08|"; offset:8; depth:3; fast_pattern;
    reference:md5,ea908652fb0c5618cfa74f6bf49b6363;
    reference:url,github.com/qwqdanchun/DcRat/blob/main/MessagePack/MessagePack/Zip.cs;
    classtype:trojan-activity;
    sid:2058998; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, affected_product Windows_8, affected_product Windows_10, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_01_06, deployment Perimeter, malware_family DCRat, malware_family Sheet_RAT, performance_impact Significant, confidence High, signature_severity Major, updated_at 2025_01_06, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
    target:src_ip;
)

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