Question 280
An analyst reviews this Fortinet logging scenario: An analyst filters a Security Fabric normalized All view but cannot see a third-party event that remains available under its original device type. Which ongoing safeguard best addresses the original risk?
Explanation
Correct Answer
Add raw-versus-normalized verification to SIEM investigation checklists. This long-term control addresses the recurring risk. The technical reason is: A raw message can be stored without being normalized into the Fabric SIEM index, so views need not contain identical rows. A later acceptance test still needs to confirm: The missing entry is located in its raw source and its parser issue is identified.
Incorrect Answers
This safeguard, “Prefer reversible search filters over evidence deletion during triage”, reduces a different source-defined risk: An analyst wants to exclude routine security scanner traffic from a hunt but deletes those records from the displayed sample export. That risk depends on: A negative Log View predicate hides matching records from a view without destroying stored evidence. The recurring problem here is an analyst filters a Security Fabric normalized All view but cannot see a third-party event that remains available under its original device type. The originally selected control “Add raw-versus-normalized verification to SIEM investigation checklists” is more specific because a raw message can be stored without being normalized into the Fabric SIEM index, so views need not contain identical rows.
This safeguard, “Pair negative search findings with log-source availability checks”, reduces a different source-defined risk: A hunt finds no malicious traffic during a three-hour window, but FortiAnalyzer Log Receive Monitor shows a branch stopped sending logs for two hours. That risk depends on: No query results cannot establish no threat activity when data ingestion was incomplete. The recurring problem here is an analyst filters a Security Fabric normalized All view but cannot see a third-party event that remains available under its original device type. The originally selected control “Add raw-versus-normalized verification to SIEM investigation checklists” is more specific because a raw message can be stored without being normalized into the Fabric SIEM index, so views need not contain identical rows.
This safeguard, “Retain sufficient original log and packet metadata for incident reconstruction”, reduces a different source-defined risk: A threat event is present but its human-readable message truncates a long HTTP request, leaving the analyst uncertain which header triggered the detection. That risk depends on: Summary message columns can omit fields that exist in original detailed log data. The recurring problem here is an analyst filters a Security Fabric normalized All view but cannot see a third-party event that remains available under its original device type. The originally selected control “Add raw-versus-normalized verification to SIEM investigation checklists” is more specific because a raw message can be stored without being normalized into the Fabric SIEM index, so views need not contain identical rows.