ET MALWARE UAC-0114/Winter Vivern Screenshot Upload M2

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:".php"; endswith;
http.header;
content:"cUsers/";
content:"Microsoft_update_tool_"; fast_pattern; distance:0;
content:".dat|0d 0a|"; within:7;
http.request_body;
content:"|89 50 4e 47 0d 0a 1a 0a|"; startswith;
target:src_ip;
Raw source ET MALWARE UAC-0114/Winter Vivern Screenshot Upload M2 · 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 UAC-0114/Winter Vivern Screenshot Upload M2";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".php"; endswith;
    http.header;
    content:"cUsers/";
    content:"Microsoft_update_tool_"; fast_pattern; distance:0;
    content:".dat|0d 0a|"; within:7;
    http.request_body;
    content:"|89 50 4e 47 0d 0a 1a 0a|"; startswith;
    reference:url,cert.gov.ua/article/3761104;
    reference:md5,4e2acf4f8a396486ab4268c94a6a245f;
    reference:url,joesandbox.com/analysis/794564/0/html;
    classtype:command-and-control;
    sid:2044062; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2023_02_02, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_02_02;
    target:src_ip;
)

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.