ET MALWARE W32.Nemim Checkin

Query · suricata

flow:to_server,established;
http.uri;
content:".php?a1="; nocase; fast_pattern;
content:"&a2="; nocase;
content:"&a3="; nocase;
pcre:"/\.php\?a1=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})&a2=[a-f0-9]{32}&a3=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/i";
Raw source ET MALWARE W32.Nemim Checkin · Suricata
Esc
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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE W32.Nemim Checkin";
    flow:to_server,established;
    http.uri;
    content:".php?a1="; nocase; fast_pattern;
    content:"&a2="; nocase;
    content:"&a3="; nocase;
    pcre:"/\.php\?a1=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})&a2=[a-f0-9]{32}&a3=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/i";
    reference:url,symantec.com/connect/blogs/infostealernemim-how-pervasive-infostealer-continues-evolve;
    classtype:command-and-control;
    sid:2017599; rev:6;
    metadata:created_at 2013_10_15, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_05;
)

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