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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
1.8 KiB
1.8 KiB
API Reference: Detecting Email Forwarding Rules Attack
Microsoft Graph API - Inbox Rules
GET https://graph.microsoft.com/v1.0/users/{user-id}/mailFolders/inbox/messageRules
Authorization: Bearer {token}
# Response
{
"value": [
{
"displayName": "Forward invoices",
"isEnabled": true,
"conditions": {"subjectContains": ["invoice", "payment"]},
"actions": {
"forwardTo": [{"emailAddress": {"address": "attacker@evil.com"}}],
"delete": true,
"markAsRead": true
}
}
]
}
Exchange Online PowerShell
# List all inbox rules for a user
Get-InboxRule -Mailbox user@company.com | FL Name, ForwardTo, RedirectTo, DeleteMessage
# Find forwarding rules across all mailboxes
Get-Mailbox -ResultSize Unlimited | ForEach-Object {
Get-InboxRule -Mailbox $_.UserPrincipalName |
Where-Object { $_.ForwardTo -or $_.RedirectTo }
}
# Search unified audit log for rule creation
Search-UnifiedAuditLog -Operations "New-InboxRule","Set-InboxRule" -StartDate (Get-Date).AddDays(-30)
Suspicious Rule Indicators
| Indicator | Severity | Description |
|---|---|---|
| External forwarding | HIGH | Forwards to non-org domain |
| Forward + delete | CRITICAL | Forwards then deletes original |
| Financial keywords | HIGH | Targets invoice/payment subjects |
| Forward + mark read | HIGH | Hides forwarded messages |
| Move to RSS/Junk | MEDIUM | Hides messages in unused folders |
Splunk SPL Detection
index=o365 Operation IN ("New-InboxRule", "Set-InboxRule")
| spath output=forward path=Parameters{}.Value
| where isnotnull(forward) AND NOT match(forward, "@company\\.com")
CLI Usage
python agent.py --token "eyJ..." --user-id user@company.com --org-domain company.com
python agent.py --audit-log exchange_audit.log