m365-entra-attack

m365-entra-attack is a skill for Claude Code, Codex from uphiago/recon-skills. It costs 128 tokens per session (5,747 once invoked), scanned A, original, MIT.

A security-testing guide for Microsoft 365 and Entra ID, Microsoft's cloud identity and access service.

In plain words
What is it for?
It is for reviewing Microsoft 365 tenants, corporate login flows, federation, Conditional Access, and account-takeover paths during an approved assessment.
Why use it?
It helps red teams assess how enterprise sign-in, password spraying, multi-factor authentication, and access policies withstand authorized attacks.

Skill for Claude CodeCodex

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

Good fit It is for reviewing Microsoft 365 tenants, corporate login flows, federation, Conditional Access, and account-takeover paths during an approved assessment.

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Install with agentmods
npx agentmods add skills/uphiago/recon-skills/m365-entra-attack
About the project

Recon Skills is a pack of security-testing skills covering reconnaissance, web applications, APIs, authentication, vulnerability validation, cloud infrastructure, and reporting. Security professionals use it for authorized assessments of systems they own or have written permission to test. The catalogue entries are individual skills from the pack.

uphiago/recon-skills · 1,254 stars · on GitHub · hiago.sh

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 uphiago/recon-skills --skill m365-entra-attack
Clone the repo
git clone --depth 1 https://github.com/uphiago/recon-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 m365-entra-attack

README.md
[![agentmods](https://agentmods.dev/badge/skills/uphiago/recon-skills/m365-entra-attack/github.svg)](https://agentmods.dev/skills/uphiago/recon-skills/m365-entra-attack)
Your own site
<a href="https://agentmods.dev/skills/uphiago/recon-skills/m365-entra-attack"><img src="https://agentmods.dev/badge/skills/uphiago/recon-skills/m365-entra-attack/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.

agentmods 80×15 button for m365-entra-attack

Your own site · 80×15
<a href="https://agentmods.dev/skills/uphiago/recon-skills/m365-entra-attack"><img src="https://agentmods.dev/badge/skills/uphiago/recon-skills/m365-entra-attack.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 128 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 5,747 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 $0.00128 $0.05747
Opus 5 $0.00064 $0.02874
Sonnet 5 $0.00026 $0.01149
Haiku 4.5 $0.00013 $0.00575

Measured 9d ago against content hash 47b08ee89c5d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

m365-entra-attack scanned grade A with 1 finding 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.

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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

import urllib.request, urllib.parse, ssl, time, json, os
Origin

Copies of this mod

1 near-identical copy found in the catalogue:

redteam/m365-entra-attack/SKILL.md · 412 lines

How it starts

The opening of the file, as written. The whole thing — 412 lines — stays where its author put it; the contents beside it link to each section on GitHub.

When to use this skill

Trigger when:

  • Target uses M365 / Entra ID (autodiscover.* records, login.microsoftonline.com redirects, "Microsoft Office 365" in tech-stack notes)
  • You have a list of corporate emails or stealer-leaked creds
  • Engagement involves "credential spray", "password spray", "Entra attack", "ATO via M365"
  • You see *.onmicrosoft.com, *-my.sharepoint.com, enterpriseregistration.*, enterpriseenrollment.* in recon
  • Client mentions "Conditional Access", "MFA bypass", "compliant device"

DO NOT use for:

  • On-prem-only Active Directory (use a separate AD-attack skill)
  • Service-to-service token attacks (different threat model)
  • Phishing-required attack chains (covered by phishing skills) — but you can prep for the credential-validation step here

Tenant discovery (msftrecon)

# For each owned domain
msftrecon -d client.example
msftrecon -d clientltd.example
msftrecon -d sister-brand-school.example

Key fields in output:

  • Tenant ID (different domains may share OR have separate tenants — always test all owned domains)
  • Federation Information.Namespace Type = Managed (cloud-only, ROPC works) | Federated (ADFS, different attack)
  • SharePoint Detected (Yes = OneDrive enum vector available)
  • Communication Services Teams/Skype (post-auth lateral targets)
  • Admin Consent Endpoint accessible (consent-phishing surface)

Red flag: if the org has multiple Entra tenants for sister domains, each is a separate attack surface with its own user list, lockout policy, and CA configuration. Don't assume one spray covers all.


AADSTS code reference (memorize)

AADSTS Meaning Lockout impact What to do
50034 User does not exist None Skip; remove from spray list
50126 Invalid username/password +1 attempt counter User exists — try alternate password later (within cap)
50053 Account locked (Smart Lockout) None (already locked) Pre-existing → flag to SOC; don't retry
53003 CA blocked token issuance +1 attempt counter PASSWORD VALID — STOP, password is correct
50076 MFA required +1 attempt counter PASSWORD VALID — second factor needed
50079 Strong auth required +1 attempt counter PASSWORD VALID — same as 50076
50158 External auth required +1 attempt counter PASSWORD VALID — federated MFA
530003 Device-state required +1 attempt counter PASSWORD VALID — needs compliant device
65001 Consent required +1 attempt counter App-consent issue, not auth
700016 App not in tenant None User in different tenant — adjust target
90002 Tenant does not exist None Tenant typo / dead tenant

Read the full file on GitHub · 412 lines

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 · 412 lines · 128 tokens per session scan A 47b08ee89c5d

Subscribe to this mod's changes

m365-entra-attack is a skill published in the GitHub repository uphiago/recon-skills (1,254 stars, last pushed 11d ago), licensed MIT. It adds 128 tokens to every session and 5,747 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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