Elastic Security Detection Rules

Microsoft 365 Exchange DKIM Signing Configuration Disabled

Last updated 7 months ago on 2025-01-15
Created 5 years ago on 2020-11-18

About

Identifies when a DomainKeys Identified Mail (DKIM) signing configuration is disabled in Microsoft 365. With DKIM in Microsoft 365, messages that are sent from Exchange Online will be cryptographically signed. This will allow the receiving email system to validate that the messages were generated by a server that the organization authorized and were not spoofed.
Tags
Domain: CloudData Source: Microsoft 365Tactic: PersistenceLanguage: kuery
Severity
medium
Risk Score
47
MITRE ATT&CK™

Persistence (TA0003)(opens in a new tab or window)

↳ Modify Authentication Process (T1556)(opens in a new tab or window)

False Positive Examples
Disabling a DKIM configuration may be done by a system or network administrator. Verify that the configuration change was expected. Exceptions can be added to this rule to filter expected behavior.
License
Elastic License v2(opens in a new tab or window)

Definition

Rule Type
Query (Kibana Query Language)
Integration Pack
Prebuilt Security Detection Rules
Index Patterns
filebeat-*logs-o365*
Related Integrations

o365(opens in a new tab or window)

Query
event.dataset:o365.audit and event.provider:Exchange and event.category:web and event.action:"Set-DkimSigningConfig" and o365.audit.Parameters.Enabled:False and event.outcome:success

Install detection rules in Elastic Security

Detect Microsoft 365 Exchange DKIM Signing Configuration Disabled in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(opens in a new tab or window).