ET ATTACK_RESPONSE Unknown Payload Downloader Inbound

Query · suricata

flow:established,to_client;
http.response_body;
content:"echo|20|Opening|20|PDF|20|file|3a 20|";
content:"set|20 22|msvpUrl|3d|http"; distance:0; fast_pattern;
content:"Invoke|2d|WebRequest|20 2d|Uri|20 27 25|msvpUrl|25 27|"; distance:0;
target:dest_ip;
Raw source ET ATTACK_RESPONSE Unknown Payload Downloader 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 $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET ATTACK_RESPONSE Unknown Payload Downloader Inbound";
    flow:established,to_client;
    http.response_body;
    content:"echo|20|Opening|20|PDF|20|file|3a 20|";
    content:"set|20 22|msvpUrl|3d|http"; distance:0; fast_pattern;
    content:"Invoke|2d|WebRequest|20 2d|Uri|20 27 25|msvpUrl|25 27|"; distance:0;
    reference:md5,3ec402cf37b62c46d70e993af8390d04;
    reference:md5,ca55900248726f166dd50a26d2221f99;
    reference:url,cyber.wtf/2025/02/12/unpacking-pyarmor-v8-scripts;
    classtype:trojan-activity;
    sid:2061149; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_03_27, deployment Perimeter, deployment SSLDecrypt, confidence Medium, signature_severity Major, updated_at 2025_03_27, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1105, mitre_technique_name Ingress_Tool_Transfer;
    target:dest_ip;
)

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