seikaikyo/analyzing-office365-audit-logs-for-compromise
external/anthropic-cybersecurity-skills/skills/analyzing-office365-audit-logs-for-compromise/SKILL.md
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.
$ install --global
skillsauthnpx skillsauth add seikaikyo/dash-skills analyzing-office365-audit-logs-for-compromiseInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
3
Scanners Passed
9
Scanners in report
Clean
TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
Skipped
Socket.devSupply chain security analysis
50%
Skipped
VirusTotalMulti-engine malware detection
50%
Skipped
CrowdStrikeAdvanced threat intelligence
50%
Skipped
OSV-ScannerOpen Source Vulnerability database check
50%
Skipped
OWASP Dep-Check
50%
Last scanned: Jun 2, 2026, 3:51 AM158.7s3 files scanned
SKILL.md
- name:
- analyzing-office365-audit-logs-for-compromise
- description:
- Parse Office 365 Unified Audit Logs via Microsoft Graph API to detect
- domain:
- cybersecurity
- subdomain:
- cloud-security
- version:
- 1.0
- author:
- mahipal
- license:
- Apache-2.0
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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