Attackers using valid credentials become insiders, making them one of the hardest threats to detect and stop. A compromised insider is any trusted user or entity whose credentials—such as employee passwords, service account privileges, or API keys—have been stolen and exploited. Once inside, attackers can conduct reconnaissance, escalate privileges, and move laterally toward their objectives while appearing legitimate. This guide explains how to identify and mitigate these risks, emphasizing proactive monitoring and advanced detection strategies to protect against insider threats and safeguard critical systems.

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