ET MALWARE Powershell with Decimal Encoded RUNPE Downloaded

Query · suricata

flow:established,to_client;
http.content_type;
content:"text/plain"; startswith;
http.response_body;
content:"RUNPE"; nocase;
content:"31,139,8,0,0,0,0,0,4,0,237,189,7,96"; within:50; fast_pattern;
content:"82,101,109,111,116,101,83,105,103,110,101,100"; distance:0;
Raw source ET MALWARE Powershell with Decimal Encoded RUNPE Downloaded · 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 Powershell with Decimal Encoded RUNPE Downloaded";
    flow:established,to_client;
    http.content_type;
    content:"text/plain"; startswith;
    http.response_body;
    content:"RUNPE"; nocase;
    content:"31,139,8,0,0,0,0,0,4,0,237,189,7,96"; within:50; fast_pattern;
    content:"82,101,109,111,116,101,83,105,103,110,101,100"; distance:0;
    reference:url,blog.morphisec.com/revealing-the-snip3-crypter-a-highly-evasive-rat-loader;
    classtype:trojan-activity;
    sid:2034980; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2022_01_26, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_01_26;
)

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