ET MALWARE Possible Mask C2 Traffic

Query · suricata

flow:established,to_server;
http.uri;
content:".cgi?Group="; nocase;
content:"&Ver="; nocase;
content:"&Inst"; nocase;
content:"&Ask="; nocase;
content:"&Bn="; nocase;
Raw source ET MALWARE Possible Mask C2 Traffic · 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 Possible Mask C2 Traffic";
    flow:established,to_server;
    http.uri;
    content:".cgi?Group="; nocase;
    content:"&Ver="; nocase;
    content:"&Inst"; nocase;
    content:"&Ask="; nocase;
    content:"&Bn="; nocase;
    reference:url,www.securelist.com/en/downloads/vlpdfs/unveilingthemask_v1.0.pdf;
    classtype:command-and-control;
    sid:2018105; rev:3;
    metadata:created_at 2014_02_11, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_27;
)

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