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CastleRAT Attack Leverages Deno JavaScript Runtime to Bypass Enterprise Defenses

Gbhackers •Mayura Kathir • March 12, 2026

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CastleRAT Exploits Deno Runtime to Evade Security Measures A new cyberattack known as CastleRAT has emerged, utilizing the Deno JavaScript runtime to bypass enterprise security defenses. The attack primarily targets organizations using Deno for application development, potentially affecting thousands of systems globally. CastleRAT employs sophisticated techniques to evade detection, making it a significant threat to enterprise environments. Security researchers have identified multiple indicators of compromise (IOCs) associated with this attack, although specific CVEs have not yet been disclosed. The scope of the impact remains under investigation, with reports of compromised systems increasing. Organizations are urged to review their security configurations and monitor for unusual activity. As of now, no official patch or remediation guidance has been released. The situation is evolving, and further updates are expected as more information becomes available. 1 sources 59

Extracted Entities

CastleRAT Attack Leverages Deno JavaScript Runtime to Bypass Enterprise Defenses

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Extracted Entities

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