ET WEB_CLIENT Generic Attempted Executable Drop via VBScript

Query · suricata

flow:established,to_client;
file.data;
content:"<SCRIPT Language=VBScript"; nocase;
content:"DropFileName"; nocase; within:100;
content:".exe"; within:100; nocase;
content:"WriteData =|20 22|4D5A"; nocase; within:100; fast_pattern;
Raw source ET WEB_CLIENT Generic Attempted Executable Drop via VBScript · 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 WEB_CLIENT Generic Attempted Executable Drop via VBScript";
    flow:established,to_client;
    file.data;
    content:"<SCRIPT Language=VBScript"; nocase;
    content:"DropFileName"; nocase; within:100;
    content:".exe"; within:100; nocase;
    content:"WriteData =|20 22|4D5A"; nocase; within:100; fast_pattern;
    classtype:trojan-activity;
    sid:2031508; rev:2;
    metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2021_01_11, deployment Perimeter, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_01_11;
)

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