Why should the underlying source events be examined?¶

The underlying source events should be examined because they contain the technical observations from which the alert was created.

The alert is an interpretation of those records.

Avoid the dangerous assumption¶

The dangerous assumption is that the alert summary is an accurate and complete substitute for the source evidence.

It may not be.

An alert may combine several events, simplify field values, add severity and apply a rule-based conclusion. It may hide duplicate records, missing fields or normal activity that weakens the suspected explanation.

The source events show what each system actually recorded. They may reveal whether an action was attempted, blocked, failed, completed or generated automatically.

They also allow investigators to check identity, timing and sequence. A username may represent a service account. A source address may belong to a proxy. A timestamp may be ingestion time rather than event time.

Investigators should preserve and review the linked raw or native events where available. Obtain field definitions, event codes and relevant configuration.

Examine the records before and after the triggering events. A short alert window may omit earlier authentication, later remediation or routine activity that explains the pattern.

Where several systems contributed, establish how the records were correlated and whether the identifiers genuinely refer to the same account, device, session or process.

Do not reject the alert simply because one source event has an innocent explanation. Equally, do not accept the alert’s conclusion without testing the whole chain.

Operational takeaway¶

The underlying source events must be examined because they establish what was actually recorded and allow the alert’s interpretation, sequence, attribution and outcome to be tested.