ET MALWARE ViperSoftX HTTP CnC Activity

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri; bsize:72;
content:"/api/v1/"; startswith; fast_pattern;
content:!"?";
pcre:"/^\/api\/v1\/[A-F0-9]{64}$/";
http.user_agent;
content:"WindowsPowerShell";
http.header_names;
content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|";
threshold:type limit, count 1, seconds 120, track by_src;
Raw source ET MALWARE ViperSoftX HTTP CnC Activity · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE ViperSoftX HTTP CnC Activity";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri; bsize:72;
    content:"/api/v1/"; startswith; fast_pattern;
    content:!"?";
    pcre:"/^\/api\/v1\/[A-F0-9]{64}$/";
    http.user_agent;
    content:"WindowsPowerShell";
    http.header_names;
    content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|";
    threshold:type limit, count 1, seconds 120, track by_src;
    reference:url,chris.partridge.tech/2022/evolution-of-vipersoftx-dga/;
    reference:url,decoded.avast.io/janrubin/vipersoftx-hiding-in-system-logs-and-spreading-venomsoftx/;
    classtype:trojan-activity;
    sid:2043167; rev:1;
    metadata:created_at 2023_01_03, malware_family ViperSoftX, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_01_03;
)

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