ET HUNTING Suspicious Chmod Usage in URI (Outbound)

Query · suricata

flow:to_server,established;
http.uri;
content:"chmod"; fast_pattern; nocase;
content:!"&launchmode=";
content:!"/chmod/";
content:!"searchmod";
pcre:"/^(?:\+|\x2520|\x24IFS|\x252B|\s)+(?:x|[0-9]{3,4})/Ri";
Raw source ET HUNTING Suspicious Chmod Usage in URI (Outbound) · 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 HUNTING Suspicious Chmod Usage in URI (Outbound)";
    flow:to_server,established;
    http.uri;
    content:"chmod"; fast_pattern; nocase;
    content:!"&launchmode=";
    content:!"/chmod/";
    content:!"searchmod";
    pcre:"/^(?:\+|\x2520|\x24IFS|\x252B|\s)+(?:x|[0-9]{3,4})/Ri";
    classtype:attempted-admin;
    sid:2029216; rev:3;
    metadata:affected_product Linux, attack_target Client_Endpoint, created_at 2019_12_31, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_27;
)

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