Troubleshoot security controls, access failures and malware symptoms

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Troubleshoot access and security-control issues involving permissions, account lockout, denied access, credential prompts, UAC behavior, firewall or endpoint-protection blocks, certificate warnings, and encryption or BitLocker-related access problems.
Diagnose symptoms that may indicate malware or compromise, such as browser redirects, fake alerts, disabled security tools, excessive pop-ups, unexplained resource usage, unauthorized changes, or suspicious processes and services.

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Apply appropriate containment and remediation steps, including isolating the system, disabling autoruns when necessary, updating security tools, scanning and removing threats, and using safe or recovery environments when normal operation is not trusted.

Differentiate between a misconfiguration and a security incident by evaluating logs, alerts, user reports, and system behavior before changing protections or removing controls.

Verify that security controls function correctly after remediation, that access is restored only to authorized users, and that the system is updated, monitored, and documented according to procedure.

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