ET MALWARE Win32/RecordBreaker - Observed UA M5 (23591)

Query · suricata

flow:to_server,established;
http.user_agent;
content:"23591"; bsize:5; startswith; fast_pattern;
Raw source ET MALWARE Win32/RecordBreaker - Observed UA M5 (23591) · 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 http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/RecordBreaker - Observed UA M5 (23591)";
    flow:to_server,established;
    http.user_agent;
    content:"23591"; bsize:5; startswith; fast_pattern;
    reference:md5,d7535e529576d7d8819f5b0260f67bfe;
    classtype:trojan-activity;
    sid:2043003; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_12_23, deployment Perimeter, deployment SSLDecrypt, malware_family Win32_RecordBreaker, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_12_23, reviewed_at 2025_10_24;
)

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