detection.wiki

Detection rules › Sigma

Suspicious Inbox Forwarding Identity Protection

Status
test
Severity
high
Log source
product azure, service riskdetection
Author
Mark Morowczynski '@markmorow', Gloria Lee, '@gleeiamglo'
Source
github.com/SigmaHQ/sigma

Indicates suspicious rules such as an inbox rule that forwards a copy of all emails to an external address

Known false positives

  • A legitimate forwarding rule.

MITRE ATT&CK coverage

TacticTechniques
Collection

Rule body

title: Suspicious Inbox Forwarding Identity Protection
id: 27e4f1d6-ae72-4ea0-8a67-77a73a289c3d
status: test
description: Indicates suspicious rules such as an inbox rule that forwards a copy of all emails to an external address
references:
    - https://learn.microsoft.com/en-us/entra/id-protection/concept-identity-protection-risks#suspicious-inbox-forwarding
    - https://learn.microsoft.com/en-us/entra/architecture/security-operations-user-accounts#unusual-sign-ins
author: Mark Morowczynski '@markmorow', Gloria Lee, '@gleeiamglo'
date: 2023-09-03
tags:
    - attack.t1114.003
    - attack.collection
logsource:
    product: azure
    service: riskdetection
detection:
    selection:
        riskEventType: 'suspiciousInboxForwarding'
    condition: selection
falsepositives:
    - A legitimate forwarding rule.
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    riskEventType: 'suspiciousInboxForwarding'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
riskEventTypeeq
  • suspiciousInboxForwarding
field:"azure_ad::risk_event_types" kind:eq value:"suspiciousInboxForwarding"