CastleStealer: An Emerging Infostealer Growing More Sophisticated

Table Of Contents Table of Contents What We Know About CastleStealer What Data Does CastleStealer Target? Bypassing App-Bound Encryption From Infostealer to Remote Access How CastleStealer Exfiltrates Stolen Data Protect Against Emerging Infostealers Using Flashpoint More subscribe to our newsletter First discovered in April 2026, CastleStealer is a C#-based information-stealing malware that has continued to add new capabilities since its emergence. Newer samples analyzed by Flashpoint can bypas