DLL hijacking occurs when attackers trick software into loading a malicious DLL instead of a legitimate one, allowing unauthorized code execution. This happens due to insecure search paths, missing DLLs, or weak file permissions. The report highlights how DLL hijacking threatens industrial environments by enabling stealthy intrusion and persistence. Defending against it requires strict DLL loading controls, proper file integrity checks, secure application configurations, and limiting write access in OT systems. Strengthening these practices helps reduce attack opportunities and improves overall OT security resilience.

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