ET MALWARE SainboxRAT CnC Checkin

Query · suricata

flow:established,to_server;
dsize:<45;
content:"HELLO|7c|"; startswith; fast_pattern;
content:"|7c|SYSTEM|0a|"; endswith;
target:src_ip;
Raw source ET MALWARE SainboxRAT 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-pkt $HOME_NET any -> $EXTERNAL_NET 1024: (
    msg:"ET MALWARE SainboxRAT CnC Checkin";
    flow:established,to_server;
    dsize:<45;
    content:"HELLO|7c|"; startswith; fast_pattern;
    content:"|7c|SYSTEM|0a|"; endswith;
    reference:md5,f5aea239fa2f9d52d6e2bb43c75533ed;
    classtype:command-and-control;
    sid:2069284; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2026_05_14, deployment Perimeter, malware_family Sainbox, confidence High, signature_severity Critical, tag c2, updated_at 2026_05_14, 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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