VBS-spawned PowerShell decodes Base64 payload via GzipStream to tmp*.bat
Detects a VBS script invoking PowerShell to decode a Base64 payload, write it to disk with a random name, and decompress it using IO.Compression.GzipStream into tmp*.bat.gz/tmp*.bat files, consistent with the AutoIT-based VIPKeylogger/MedusaHVNC infection chain.
Microsoft Sentinel (KQL)
