An engineer receives a report that indicates a possible incident of a malicious insider sending company information to outside parties. What is the first action the engineer must take to determine…

Analyzing environmental threats and causes is a post-confirmation activity that occurs after an incident is validated, not the first step in determining whether one occurred.

Informing the product security incident response team before confirming an incident risks misallocating resources and escalating prematurely based on an unverified report.

Per the NIST SP 800-61 incident response lifecycle, the detection and analysis phase requires examining precursors - signs that an incident may occur - and indicators - signs that an incident is actively occurring or has occurred - before any other action is taken. For an insider threat report, this means reviewing data transfer logs, DLP alerts, email records, and access logs to find evidence that sensitive data was actually exfiltrated. Only after this analysis provides sufficient evidence can the team make an informed, justified decision about escalation and response.

Notifying the CSIRT is an escalation action that should occur only after preliminary analysis confirms a credible incident, not as the very first investigative step.