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mukul975
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Complete skill folder anatomy across all cybersecurity skills: - scripts/agent.py: 80-150 line Python agents using real libraries (impacket, boto3, azure-mgmt-*, kubernetes, pefile, yara, scapy, shodan, stix2, etc.) - references/api-reference.md: real API documentation with method signatures - LICENSE: MIT license for all skill folders
67 lines
1.9 KiB
Markdown
67 lines
1.9 KiB
Markdown
# API Reference: Detecting Business Email Compromise
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## Python email Library
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```python
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import email
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from email import policy
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# Parse .eml file
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with open("message.eml") as f:
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msg = email.message_from_file(f, policy=policy.default)
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msg.get("From") # sender header
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msg.get("Reply-To") # reply-to header
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msg.get("Authentication-Results") # SPF/DKIM/DMARC results
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body = msg.get_body(preferencelist=("plain", "html"))
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body.get_content() # decoded body text
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```
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## Authentication Header Patterns
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| Result | Meaning |
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|--------|---------|
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| `spf=pass` | Sender IP authorized by domain SPF record |
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| `spf=fail` | Sender IP NOT in SPF record |
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| `dkim=pass` | DKIM signature valid |
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| `dkim=fail` | DKIM signature invalid or missing |
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| `dmarc=pass` | SPF or DKIM aligned with From domain |
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| `dmarc=fail` | Neither SPF nor DKIM aligned |
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## BEC Attack Types (FBI IC3)
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| Type | Description |
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|------|-------------|
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| CEO Fraud | Impersonates executive requesting wire transfer |
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| Invoice Fraud | Fake invoice with changed bank details |
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| Account Compromise | Compromised email used for payment requests |
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| Attorney Impersonation | Urgent legal matter requiring funds |
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| Data Theft | Requests for W-2 / PII from HR |
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## BEC Indicator Regex Patterns
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```python
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# Financial urgency
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r"\b(wire transfer|bank transfer|routing number)\b"
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# Secrecy pressure
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r"\b(confidential|do not share|keep this between us)\b"
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# Gift card fraud
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r"\b(gift card|bitcoin|crypto|western union)\b"
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# Account change
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r"\b(change.*(bank|account|payment))\b"
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```
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## Microsoft Graph API - Mail Security
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```http
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GET https://graph.microsoft.com/v1.0/me/messages?$filter=internetMessageHeaders/any(h: h/name eq 'Authentication-Results')
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Authorization: Bearer {token}
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```
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## CLI Usage
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```bash
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python agent.py --email-file suspicious.eml --vip-names "John Smith" "Jane CEO"
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python agent.py --scan-dir /var/mail/quarantine/ --vip-names "CFO Name"
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```
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