ET HUNTING Powershell Downloader with Start-Process Inbound M1

Query · suricata

flow:established,to_client;
http.stat_code;
content:"200";
http.response_body;
content:"new-object System.Net.WebClient"; nocase; fast_pattern;
content:".DownloadFile("; distance:0;
content:"Start-Process"; within:500;
Raw source ET HUNTING Powershell Downloader with Start-Process Inbound 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 $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET HUNTING Powershell Downloader with Start-Process Inbound M1";
    flow:established,to_client;
    http.stat_code;
    content:"200";
    http.response_body;
    content:"new-object System.Net.WebClient"; nocase; fast_pattern;
    content:".DownloadFile("; distance:0;
    content:"Start-Process"; within:500;
    reference:md5,b510f48b9ac735a197093ad5fb99b0ee;
    classtype:bad-unknown;
    sid:2029339; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_01_29, deployment Perimeter, confidence Medium, signature_severity Informational, updated_at 2020_08_19;
)

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