ET INFO Powershell Base64 Decode Command Inbound

Query · suricata

flow:established,from_server;
file.data;
content:"[System.Text.Encoding]"; nocase;
content:"[System.Convert]::FromBase64String"; nocase; fast_pattern; within:100;
Raw source ET INFO Powershell Base64 Decode Command Inbound · 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 any any -> [$HOME_NET,$HTTP_SERVERS] any (
    msg:"ET INFO Powershell Base64 Decode Command Inbound";
    flow:established,from_server;
    file.data;
    content:"[System.Text.Encoding]"; nocase;
    content:"[System.Convert]::FromBase64String"; nocase; fast_pattern; within:100;
    classtype:misc-activity;
    sid:2036760; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_06_02, deployment Perimeter, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_06_02, reviewed_at 2024_05_07;
)

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