Versions (3)
Version DetailsCurrent
Rev: 1 • Feb 2, 2023, 12:00 PMET MALWARE UAC-0114/Winter Vivern File Exfilration
alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE UAC-0114/Winter Vivern File Exfilration"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; endswith; http.request_body; content:"C:|5c|Users|5c|"; startswith; fast_pattern; content:"|5c|"; within:270; content:"|5c|"; within:50; content:"|2e|"; within:300; content:"###"; within:9; reference:url,cert.gov.ua/article/3761104; reference:md5,4e2acf4f8a396486ab4268c94a6a245f; reference:url,joesandbox.com/analysis/794564/0/html; classtype:command-and-control; sid:2044063; 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;)
Feb 2, 2023, 12:00 PM
Feb 2, 2023, 12:00 PM
Feb 2, 2023, 11:00 PM
Aug 25, 2025, 9:35 PM
rules/emerging-malware.rules