This paper analyzes the Vidar Infostealer, a malware that spreads through social engineering and has evolved from earlier Arkei variants into a highly sophisticated credential‑stealing tool. It uses multiple evasion techniques, including AMSI bypass, Defender exclusions, and API hijacking such as CryptProtectMemory to steal sensitive data. Vidar maintains persistence, collects credentials and system information, and exfiltrates it covertly using dead drop resolvers. The report also details how Unified SASE can help disrupt such attacks through stronger visibility, access controls, and integrated threat prevention.

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