Vidar - Reversed String Endpoint Construction (T1027)

Ibrahim Saud@tektrix

•updated Jun 21, 2026•1•0•2

Detects PowerShell commands that contain a reversed string pattern often used by Vidar malware to de-obfuscate its C2 endpoint at runtime. The specific pattern 'txt.[0-9a-zA-Z]+/selif_cilbup' is indicative of this technique.