About

Imported from mukul975/anthropic-cybersecurity-skills (skills/analyzing-office365-audit-logs-for-compromise/SKILL.md). Install upstream with npx skills add mukul975/anthropic-cybersecurity-skills --skill analyzing-office365-audit-logs-for-compromise. Copyright stays with the author (Apache-2.0).

Analyzing Office 365 Audit Logs for Compromise

Name: analyzing-office365-audit-logs-for-compromise
Author: mukul975

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

Use it

Copy one of these into your project. Installing also returns the manifest and these snippets.

yaml

targets:
  - https://api.opensmartroute.ai/api/v1/registry/mukul975-anthropic-cybersecurity-skills-analyzing-office-eb46dc/manifest   # or paste the manifest below

Manifest

An Open Capability Manifest: the router reads it to know what this does, what it costs and when to pick it.

mukul975-anthropic-cybersecurity-skills-analyzing-office-eb46dc.ocm.jsonjson

{
  "ocm": "1",
  "id": "mukul975-anthropic-cybersecurity-skills-analyzing-office-eb46dc",
  "kind": "skill",
  "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.",
  "publisher": "mukul975",
  "version": "1.0.0",
  "capabilities": {
    "domains": [
      "coding"
    ],
    "tags": [
      "skill-md",
      "office365",
      "microsoft-graph",
      "audit-logs",
      "email-compromise",
      "inbox-rules",
      "oauth",
      "bec",
      "skills-sh"
    ],
    "languages": [
      "en"
    ]
  },
  "quality_prior": 0.6,
  "examples": [
    "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."
  ],
  "primary": false,
  "metadata": {
    "source": {
      "provider": "skills.sh",
      "repository": "https://github.com/mukul975/anthropic-cybersecurity-skills",
      "path": "skills/analyzing-office365-audit-logs-for-compromise/SKILL.md",
      "ref": "HEAD",
      "url": "https://github.com/mukul975/anthropic-cybersecurity-skills/blob/HEAD/skills/analyzing-office365-audit-logs-for-compromise/SKILL.md",
      "key": "mukul975/anthropic-cybersecurity-skills/skills/analyzing-office365-audit-logs-for-compromise/SKILL.md"
    },
    "license": "Apache-2.0"
  },
  "instructions": "# Analyzing Office 365 Audit Logs for Compromise\n\n## Overview\n\nBusiness 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.\n\n\n## When to Use\n\n- When investigating security incidents that require analyzing office365 audit logs for comp",
  "cost": {
    "context_tokens": 438
  }
}

Fetch it by URL: GET /api/v1/registry/mukul975-anthropic-cybersecurity-skills-analyzing-office-eb46dc/manifest?version=1.0.0

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