ET MALWARE Ursnif Payload Downloader Inbound

Query · suricata

flow:established,to_client;
http.response_body;
content:"|24|path|20 3d 20 24|Env|3a|temp|2b 27|"; startswith; fast_pattern;
content:"|27 3b 20 24|client|20 3d 20|New|2d|Object|20|System|2e|Net|2e|WebClient|3b|";
content:"|27 2c 24|path|29 3b 20|Start|2d|Process|20 2d|FilePath|20 24|path"; endswith;
Raw source ET MALWARE Ursnif 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 MALWARE Ursnif Payload Downloader Inbound";
    flow:established,to_client;
    http.response_body;
    content:"|24|path|20 3d 20 24|Env|3a|temp|2b 27|"; startswith; fast_pattern;
    content:"|27 3b 20 24|client|20 3d 20|New|2d|Object|20|System|2e|Net|2e|WebClient|3b|";
    content:"|27 2c 24|path|29 3b 20|Start|2d|Process|20 2d|FilePath|20 24|path"; endswith;
    reference:url,twitter.com/reecdeep/status/1709916341539320019;
    classtype:trojan-activity;
    sid:2048485; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_10_06, deployment Perimeter, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_10_06;
)

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