ET MALWARE Win32/Unknown Stealer CnC Log Exfil

Query · suricata

flow:established,to_server;
content:"log|5b|split|5d|"; startswith; fast_pattern;
pcre:"/^\x5b[A-Z]{2}\x5d\x20[A-Z0-9]{32}\x20\x5b[0-9]{2}\x2d[0-9]{2}\x2d[0-9]{4}\x20[0-9]{2}\x2d[0-9]{2}\x2d[0-9]{2}\x5d\x5bsplit\x5d/R";
Raw source ET MALWARE Win32/Unknown Stealer CnC Log Exfil · 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 $HOME_NET any -> $EXTERNAL_NET 1024: (
    msg:"ET MALWARE Win32/Unknown Stealer CnC Log Exfil";
    flow:established,to_server;
    content:"log|5b|split|5d|"; startswith; fast_pattern;
    pcre:"/^\x5b[A-Z]{2}\x5d\x20[A-Z0-9]{32}\x20\x5b[0-9]{2}\x2d[0-9]{2}\x2d[0-9]{4}\x20[0-9]{2}\x2d[0-9]{2}\x2d[0-9]{2}\x5d\x5bsplit\x5d/R";
    reference:md5,62c49cd81d701e2ad31009bb012758b7;
    reference:url,twitter.com/James_inthe_box/status/1539639477676568576;
    classtype:command-and-control;
    sid:2037088; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_06_22, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_06_22;
)

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