CastleStealer: An Emerging Infostealer Growing More Sophisticated

Reported by Flashpoint (Flashpoint Intel Team)

Summary by Cyber Security News8 Oct 2026, 18:49 CEST

About this summary. This is a short, independently written summary of an article first published by Flashpoint. Cyber Security News did not report or verify the underlying story. Read the original: https://flashpoint.io/blog/castlestealer-an-emerging-infostealer-growing-more-sophisticated/

Table Of ContentsTable of ContentsWhat We Know About CastleStealerWhat Data Does CastleStealer Target?Bypassing App-Bound EncryptionFrom Infostealer to Remote AccessHow CastleStealer Exfiltrates Stolen DataProtect Against Emerging Infostealers Using FlashpointMoresubscribe 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.

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