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Insider threats are the hardest to detect because the attacker already has a badge. Practice investigating suspicious behavior, coordinating with HR and legal, and revoking access without tipping off the suspect -- all in realistic tabletop exercises.
Human error is a factor in 26% of all data breaches according to IBM's Cost of a Data Breach Report 2025. The average breach lifecycle is 241 days, giving insiders prolonged windows to cause damage before detection. Third-party involvement appears in 30% of all breach cases (Verizon DBIR 2025), highlighting the risk from contractors and vendors with trusted access. Trusted access makes insiders uniquely dangerous and difficult to detect.
Sources: IBM Cost of a Data Breach 2025, Verizon DBIR 2025Practice responding to different insider threat types and motivations
Employee stealing IP or customer data. Practice detection through UBA and DLP, investigation, and legal coordination.
Departing employee deleting or corrupting data. Test off-boarding procedures and access revocation timing.
Admin accessing unauthorized data out of curiosity or malice. Practice privileged access monitoring.
Careless employee exposing data through misconfiguration. Test education vs. disciplinary response.
External attacker using stolen insider credentials. Practice distinguishing compromise from malicious activity.
Contractor or vendor abusing access. Test third-party access governance and monitoring.
Sensitive investigations requiring balance between security and employee rights
Insider threat investigations are high-stakes. Practice the coordination between security, HR, and legal before it matters.
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