Vidar Malware: How the Multithreaded Windows Stealer Works

Vidar is a commercially sold Windows infostealer (MaaS) rewritten in C with a multithreaded engine and advanced evasion (AMSI bypass, control-flow flattening, signed loader abuse, file-size inflation); it steals browser credentials (including bypassing Chrome App‑Bound Encryption via memory-forking and APC injection), wallets, tokens and files, and exfiltrates data via HTTP multipart POSTs to round‑robin C2 resolved through Telegram and Steam dead-drops, with distribution observed via malvertising and crackware loaders.