ET HUNTING Suspicious Zipped Filename in Outbound POST Request (Steam_htmlcache.txt)

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.request_body;
content:"PK|03 04|";
byte_test:1,<=,20,0,relative;
content:"Steam_htmlcache.txt"; distance:0; nocase; fast_pattern;
Raw source ET HUNTING Suspicious Zipped Filename in Outbound POST Request (Steam_htmlcache.txt) · 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 Zipped Filename in Outbound POST Request (Steam_htmlcache.txt)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.request_body;
    content:"PK|03 04|";
    byte_test:1,<=,20,0,relative;
    content:"Steam_htmlcache.txt"; distance:0; nocase; fast_pattern;
    classtype:trojan-activity;
    sid:2037091; rev:4;
    metadata:attack_target Client_Endpoint, created_at 2022_06_22, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag Stealer, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_08_22, reviewed_at 2024_04_17;
)

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