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analyzing-office365-audit-logs-for-compromise

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更新日2026年7月2日 08:56

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.

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Estudely/riftor

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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

Authenticate to Microsoft Graph using MSAL client credentials flow
Query Unified Audit Log for suspicious operations (Set-Mailbox, New-InboxRule)
Enumerate inbox rules across mailboxes and flag forwarding rules
Detect mailbox delegation changes (Add-MailboxPermission)
Identify OAuth consent grants to suspicious applications
Check for suspicious sign-in patterns from audit logs
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

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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

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

Authenticate to Microsoft Graph using MSAL client credentials flow
Query Unified Audit Log for suspicious operations (Set-Mailbox, New-InboxRule)
Enumerate inbox rules across mailboxes and flag forwarding rules
Detect mailbox delegation changes (Add-MailboxPermission)
Identify OAuth consent grants to suspicious applications
Check for suspicious sign-in patterns from audit logs
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