ET HUNTING Suspicious User-Agent Containing .exe

Query · suricata

flow:established,to_server;
http.uri;
content:!"CTX_";
http.header;
content:!"lnssatt.exe";
http.user_agent;
content:".exe"; nocase; endswith; fast_pattern;
content:!"|5C|Citrix|5C|ICA Client|5C|"; nocase;
content:!"vsee.exe"; nocase;
http.host;
content:!"gfi.com";
content:!"pandasoftware.com";
Raw source ET HUNTING Suspicious User-Agent Containing .exe · 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 User-Agent Containing .exe";
    flow:established,to_server;
    http.uri;
    content:!"CTX_";
    http.header;
    content:!"lnssatt.exe";
    http.user_agent;
    content:".exe"; nocase; endswith; fast_pattern;
    content:!"|5C|Citrix|5C|ICA Client|5C|"; nocase;
    content:!"vsee.exe"; nocase;
    http.host;
    content:!"gfi.com";
    content:!"pandasoftware.com";
    classtype:trojan-activity;
    sid:2013224; rev:16;
    metadata:affected_product Any, attack_target Client_Endpoint, created_at 2011_07_07, deployment Perimeter, confidence Medium, signature_severity Informational, tag User_Agent, updated_at 2020_09_14;
)

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