ET MALWARE Win32/WhiskerSpy - FTP STOR Command M1

Query · suricata

flow:established,to_server;
content:"STOR l";
pcre:"/^[a-f0-9]{16}\x0d\x0a/R";
target:src_ip;
Raw source ET MALWARE Win32/WhiskerSpy - FTP STOR Command M1 · 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 ftp $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/WhiskerSpy - FTP STOR Command M1";
    flow:established,to_server;
    content:"STOR l";
    pcre:"/^[a-f0-9]{16}\x0d\x0a/R";
    reference:md5,cdf9e79b37ae70fb19b504f81e655d2a;
    reference:url,trendmicro.com/en_us/research/23/b/earth-kitsune-delivers-new-whiskerspy-backdoor.html;
    classtype:trojan-activity;
    sid:2044255; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2023_02_20, deployment Perimeter, malware_family WhiskerSpy, performance_impact Moderate, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_02_20;
    target:src_ip;
)

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