ET HUNTING Request for EXE via WinHTTP M1

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:".exe"; endswith;
http.user_agent;
content:"Mozilla/4.0 (compatible|3b 20|Win32|3b 20|WinHttp.WinHttpRequest.5)"; bsize:57; fast_pattern;
http.header_names;
content:!"Referer";
Raw source ET HUNTING Request for EXE via WinHTTP M1 · Suricata
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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 Request for EXE via WinHTTP M1";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:".exe"; endswith;
    http.user_agent;
    content:"Mozilla/4.0 (compatible|3b 20|Win32|3b 20|WinHttp.WinHttpRequest.5)"; bsize:57; fast_pattern;
    http.header_names;
    content:!"Referer";
    classtype:bad-unknown;
    sid:2029840; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_04_09, deployment Perimeter, confidence Medium, signature_severity Informational, updated_at 2020_04_09;
)

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