ET MALWARE SillyRAT CnC Command Inbound (Keylogger:On)

Query · suricata

flow:established,to_client;
dsize:<32;
content:"a2V5bG9nZ2VyOm9u|0a|"; startswith;
threshold:type limit,count 1,seconds 300,track by_dst;
target:dest_ip;
Raw source ET MALWARE SillyRAT CnC Command Inbound (Keylogger:On) · 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 SillyRAT CnC Command Inbound (Keylogger:On)";
    flow:established,to_client;
    dsize:<32;
    content:"a2V5bG9nZ2VyOm9u|0a|"; startswith;
    threshold:type limit,count 1,seconds 300,track by_dst;
    reference:url,github.com/hash3liZer/SillyRAT;
    classtype:command-and-control;
    sid:2063513; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Linux, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_07_16, deployment Perimeter, malware_family SillyRat, confidence High, signature_severity Critical, updated_at 2025_07_16, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1095, mitre_technique_name Non_Application_Layer_Protocol;
    target:dest_ip;
)

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