An AWS S3 bucket mfaDelete is disabled

cloudtrail

Classification:

attack

Tactic:

TA0005-defense-evasion

Technique:

T1562-impair-defenses

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Goal

Detect if versioning or MFA delete was disabled within an AWS S3 bucket’s Lifecycle configuration.

Strategy

This rule has two separate queries. The first query determines if @requestParameters.VersioningConfiguration.MfaDelete is set to Disabled. The second query determines if @requestParameters.VersioningConfiguration.Status is set to Suspended. For generating a signal, there are two cases. Case one generates a Medium signal if query one AND two return true. Case two will generate a Low signal if query one OR two returns true.

NOTE: Versioning cannot be disabled permanently; only suspended until turned back on, once it has been enabled on a bucket.

Triage & Response

Determine if {{@evt.name}} should have occurred on the {{@requestParameters.bucketName}} by username: {{@userIdentity.sessionContext.sessionIssuer.userName}}, accountId: {{@userIdentity.accountId}} of type: {{@userIdentity.assumed_role}}.