analyzing-office365-audit-logs-for-compromise

analyzing-office365-audit-logs-for-compromise is a skill for Claude Code, Codex from autohandai/community-skills. It costs 46 tokens per session (383 once invoked), scanned A, original, Apache-2.0.

A method for analyzing Microsoft 365 audit records to find signs that an email account or mailbox has been compromised.

In plain words
What is it for?
Use it with Microsoft Graph to inspect inbox rules, forwarding, delegation changes, OAuth app grants, and suspicious sign-ins.
Why use it?
It helps detect hidden forwarding, unauthorized mailbox access, suspicious application permissions, and other business email compromise indicators.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it with Microsoft Graph to inspect inbox rules, forwarding, delegation changes, OAuth app grants, and suspicious sign-ins.

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Install with agentmods
npx agentmods add skills/autohandai/community-skills/analyzing-office365-audit-logs-for-compromise
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add autohandai/community-skills --skill analyzing-office365-audit-logs-for-compromise
Clone the repo
git clone --depth 1 https://github.com/autohandai/community-skills

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for analyzing-office365-audit-logs-for-compromise

README.md
[![agentmods](https://agentmods.dev/badge/skills/autohandai/community-skills/analyzing-office365-audit-logs-for-compromise/github.svg)](https://agentmods.dev/skills/autohandai/community-skills/analyzing-office365-audit-logs-for-compromise)
Your own site
<a href="https://agentmods.dev/skills/autohandai/community-skills/analyzing-office365-audit-logs-for-compromise"><img src="https://agentmods.dev/badge/skills/autohandai/community-skills/analyzing-office365-audit-logs-for-compromise/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

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Your own site · 80×15
<a href="https://agentmods.dev/skills/autohandai/community-skills/analyzing-office365-audit-logs-for-compromise"><img src="https://agentmods.dev/badge/skills/autohandai/community-skills/analyzing-office365-audit-logs-for-compromise.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 46 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 383 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00046 $0.00383
Opus 5 $0.00023 $0.00192
Sonnet 5 $0.00009 $0.00077
Haiku 4.5 $0.00005 $0.00038

Measured 9d ago against content hash 90357aeaf61b, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

analyzing-office365-audit-logs-for-compromise scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/agent.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

analyzing-office365-audit-logs-for-compromise/SKILL.md · 39 lines

What it actually says

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.

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
Files

What ships with it

3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 9d ago First seen · 39 lines · 46 tokens per session scan A 90357aeaf61b

Subscribe to this mod's changes

analyzing-office365-audit-logs-for-compromise is a skill published in the GitHub repository autohandai/community-skills (11 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 46 tokens to every session and 383 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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