ET MALWARE Possible AMSI Powershell Bypass Attempt B643

Query · suricata

flow:established,from_server;
file_data;
content:"<script"; nocase;
content:"powershell"; nocase; distance:0;
content:"hAG0AcwBpAEkAbgBpAHQARgBhAGkAbABlAG"; fast_pattern;
Raw source ET MALWARE Possible AMSI Powershell Bypass Attempt B643 · 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 Possible AMSI Powershell Bypass Attempt B643";
    flow:established,from_server;
    file_data;
    content:"<script"; nocase;
    content:"powershell"; nocase; distance:0;
    content:"hAG0AcwBpAEkAbgBpAHQARgBhAGkAbABlAG"; fast_pattern;
    classtype:trojan-activity;
    sid:2024536; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_08_11, deployment Perimeter, confidence Medium, signature_severity Major, updated_at 2019_07_26;
)

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