Analyzing Office365 Audit Logs For CompromiseSAFE

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The instruction file, verbatim from the audited commit — this is the text the model reads, and the surface the audit's instruction layer examines. Quoted here so you can judge it without cloning anything.

---
name: analyzing-office365-audit-logs-for-compromise
description: Parse Office 365 Unified Audit Logs via Microsoft Graph API to detect
  email forwarding rule creation, inbox delegation, suspicious OAuth app grants, and
  other indicators of account compromise.
domain: cybersecurity
subdomain: cloud-security
tags:
- Office365
- Microsoft-Graph
- audit-logs
- email-compromise
- inbox-rules
- OAuth
- BEC
version: '1.0'
author: mahipal
license: Apache-2.0
nist_csf:
- PR.IR-01
- ID.AM-08
- GV.SC-06
- DE.CM-01
mitre_attack:
- T1114.002
- T1098.002
- T1556.006
- T1078.004
---

# Analyzing Office 365 Audit Logs for Compromise

## Overview

Business Email Compromise (BEC) attacks often leave traces in Office 365 audit logs: suspicious inbox rule creation, email forwarding to external addresses, mailbox delegation changes, and unauthorized OAuth application consent grants. This skill uses the Microsoft Graph API to query the Unified Audit Log, enumerate inbox rules across mailboxes, detect forwarding configurations, and identify compromised account indicators.


## When to Use

- When investigating security incidents that require analyzing office365 audit logs for compromise
- When building detection rules or threat hunting queries for this domain
- When SOC analysts need structured procedures for this analysis type
- When validating security monitoring coverage for related attack techniques

## Prerequisites

- Azure AD app registration with `AuditLog.Read.All`, `MailboxSettings.Read`, `Mail.Read` (application permissions)
- Python 3.9+ with `msal`, `requests`
- Client secret or certificate for authentication
- Global Reader or Security Reader role

## Steps

1. Authenticate to Microsoft Graph using MSAL client credentials flow
2. Query Unified Audit Log for suspicious operations (Set-Mailbox, New-InboxRule)
3. Enumerate inbox rules across mailboxes and flag forwarding rules
4. Detect mailbox delegation changes (Add-MailboxPermission)
5. Identify OAuth consent grants to suspicious applications
6. Check for suspicious sign-in patterns from audit logs
7. Generate compromise indicator report with timeline

## Expected Output

- JSON report listing forwarding rules, delegation changes, OAuth grants, and suspicious audit events with risk scores
- Timeline of compromise indicators with affected mailboxes

SAFEgrade B · trust 89/100 Nothing in the source contradicts what it says it does. Grade A is reserved for packages that have also passed the behavioural sandbox.

What the source does

Filesystem

none-observed

Network

declared (2 observation(s))

Shell

none-observed

Dependencies

pinned

Secrets in source

none-found

Findings (0)

No findings outside the package's declared scope.

Gates applied: no_behavioural_pass.