ET MALWARE CSharp SMB Scanner Assembly in PowerShell Inbound M2

Query · suricata

flow:established,from_server;
http.stat_code;
content:"200";
file.data;
content:"|20|=|20|new|20|byte|5b 5d|";
content:"0xff,0x53,0x4d,0x42"; within:300; fast_pattern;
content:"0x01,0x28"; distance:0;
content:"0x02,0x4c,0x41,0x4e";
Raw source ET MALWARE CSharp SMB Scanner Assembly in PowerShell Inbound M2 · 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 MALWARE CSharp SMB Scanner Assembly in PowerShell Inbound M2";
    flow:established,from_server;
    http.stat_code;
    content:"200";
    file.data;
    content:"|20|=|20|new|20|byte|5b 5d|";
    content:"0xff,0x53,0x4d,0x42"; within:300; fast_pattern;
    content:"0x01,0x28"; distance:0;
    content:"0x02,0x4c,0x41,0x4e";
    reference:md5,e5a9c413812b5217ef0da962668e9651;
    classtype:trojan-activity;
    sid:2027337; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, created_at 2019_05_08, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag PowerShell, tag T1086, updated_at 2020_11_18;
)

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