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- Add mitre_f3 frontmatter block to 94 fraud-relevant skills (phishing, account takeover, banking malware, BEC, identity/KYC, payment/card fraud, money-mule/cash-out, ransomware extortion, DFIR, threat intel) - Map each skill to F3 v1.1 tactics + precise technique IDs, including the two F3-specific tactics ATT&CK lacks: Positioning (FA0001) and Monetization (FA0002) - All 123 F3 v1.1 technique IDs validated against the upstream STIX bundle (github.com/center-for-threat-informed-defense/fight-fraud-framework): 0 invalid IDs, 0 invalid tactics, 0 name mismatches, no placeholder IDs - mitre_f3 kept as a separate block from mitre_attack (F3 redefines several ATT&CK tactics for the fraud context) - Add docs/mitre-f3-mapping.md schema reference - Update README: F3 as the 6th framework, dedicated F3 section + badge
159 lines
6.7 KiB
Markdown
159 lines
6.7 KiB
Markdown
---
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name: implementing-mimecast-targeted-attack-protection
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description: Deploy Mimecast Targeted Threat Protection including URL Protect, Attachment
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Protect, Impersonation Protect, and Internal Email Protect to defend against advanced
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phishing and spearphishing attacks.
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domain: cybersecurity
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subdomain: phishing-defense
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tags:
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- mimecast
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- email-security
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- targeted-threat-protection
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- url-protect
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- impersonation
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- attachment-sandboxing
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- phishing
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version: '1.0'
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author: mahipal
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license: Apache-2.0
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nist_csf:
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- PR.AT-01
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- DE.CM-09
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- RS.CO-02
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- DE.AE-02
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mitre_attack:
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- T1566
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- T1598
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- T1534
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- T1036
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mitre_f3:
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version: '1.1'
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tactics:
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- initial-access
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- reconnaissance
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- stealth
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- resource-development
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techniques:
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- id: T1660
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name: Phishing
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tactic: initial-access
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source: attack
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- id: T1598
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name: Phishing for Information
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tactic: reconnaissance
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source: attack
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- id: T1672
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name: Email Spoofing
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tactic: stealth
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source: attack
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- id: F1032
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name: Impersonate Official
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tactic: initial-access
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source: f3
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- id: F1020.002
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name: 'Create Fake Materials: Fake Website'
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tactic: resource-development
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source: f3
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---
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# Implementing Mimecast Targeted Attack Protection
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## Overview
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Mimecast Targeted Threat Protection (TTP) is a suite of advanced email security services designed to protect against sophisticated phishing, spearphishing, and targeted attacks. TTP consists of four core modules: URL Protect (real-time URL rewriting and click-time analysis), Attachment Protect (sandbox detonation of suspicious attachments), Impersonation Protect (BEC and whaling detection), and Internal Email Protect (scanning internal/outbound email for threats). As of November 2025, Mimecast enabled URL Pre-Delivery Action with Hold setting for all customers by default.
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## When to Use
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- When deploying or configuring implementing mimecast targeted attack protection capabilities in your environment
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- When establishing security controls aligned to compliance requirements
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- When building or improving security architecture for this domain
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- When conducting security assessments that require this implementation
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## Prerequisites
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- Mimecast Email Security license with TTP add-on
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- Administrative access to Mimecast Administration Console
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- Microsoft 365 or Google Workspace environment
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- MX records configured to route through Mimecast
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- Understanding of email authentication (SPF, DKIM, DMARC)
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## Key Concepts
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### TTP Module Overview
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| Module | Function | Key Capability |
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|---|---|---|
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| URL Protect | Rewrites and scans URLs at click time | Real-time sandbox, pre-delivery hold |
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| Attachment Protect | Sandboxes suspicious attachments | Static + dynamic analysis |
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| Impersonation Protect | Detects BEC/whaling attacks | VIP name matching, header analysis |
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| Internal Email Protect | Scans internal/outbound email | Lateral phishing detection |
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### Impersonation Protection Scenarios
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- **Hit 3 (Default)**: Flags emails matching 3+ impersonation indicators
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- **Hit 1 (VIP)**: Flags emails matching 1+ indicator for designated VIP users
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- Key identifiers: display name similarity, domain similarity, reply-to mismatch, newly registered domains
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### URL Protect Modes
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- **Rewrite**: URLs rewritten to route through Mimecast proxy at click time
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- **Pre-Delivery Action (Hold)**: URLs checked before message delivery; held if suspicious
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- **Pre-Delivery Action (None)**: URLs checked pre-delivery but not held
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## Workflow
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### Step 1: Configure URL Protect Policy
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- Navigate to Administration > Gateway > Policies > Targeted Threat Protection - URL Protect
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- Create URL Protect definition with rewriting enabled for inbound messages
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- Enable URL Pre-Delivery Action set to "Hold" for maximum protection
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- Configure scan mode: aggressive for high-risk users, moderate for general population
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- Set action for malicious URLs: block page with user notification
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- Enable URL logging for all click events
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### Step 2: Configure Attachment Protect Policy
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- Navigate to Administration > Gateway > Policies > Targeted Threat Protection - Attachment Protect
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- Create Attachment Protect definition for inbound email
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- Select sandbox mode: "Safe File" (converts to safe format) or "Dynamic Configuration" (full sandbox)
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- Configure attachment types to scan: executables, Office documents, PDFs, archives
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- Set timeout for sandbox analysis (default: up to 7 minutes for complex files)
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- Enable pre-emptive sandboxing for attachments from unknown senders
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### Step 3: Configure Impersonation Protect
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- Create Default Impersonation Protect Definition (Hit 3) for all inbound email
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- Create VIP Impersonation Protect Definition (Hit 1) for executive protection
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- Build VIP list: CEO, CFO, CTO, board members, finance leadership
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- Configure detection identifiers: display name, domain similarity, newly observed sender
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- Set actions: quarantine high-confidence impersonation, tag moderate confidence
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- Enable end-user warning banners for flagged messages
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### Step 4: Enable Internal Email Protect
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- Configure journaling from Microsoft 365/Google Workspace to Mimecast
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- Enable URL scanning for internal emails
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- Enable attachment scanning for internal emails
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- Configure alerts for internal account compromise indicators
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- Set up detection for internal phishing (compromised account sending malware)
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### Step 5: Create Test Group and Validate
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- Create pilot group of 50-100 users across departments
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- Apply TTP policies to pilot group first
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- Send test emails with known-safe test URLs and EICAR test files
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- Verify URL rewriting, attachment sandboxing, and impersonation detection
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- Monitor false positive rate for 1-2 weeks before organization-wide deployment
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### Step 6: Deploy Organization-Wide and Tune
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- Extend TTP policies to all users
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- Monitor Mimecast Threat Dashboard for detection metrics
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- Review and whitelist legitimate applications triggering false positives
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- Tune impersonation sensitivity based on false positive feedback
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- Configure exception policies for automated systems and mailing lists
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## Tools & Resources
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- **Mimecast Administration Console**: Policy configuration and management
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- **Mimecast Threat Dashboard**: Real-time threat visibility and analytics
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- **Mimecast Awareness Training**: Integrated security awareness platform
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- **Mimecast API**: Programmatic access to logs and threat data
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- **Message Center**: Quarantine management for admins and users
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## Validation
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- URL Protect rewrites URLs in test messages and blocks known-malicious at click
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- Attachment Protect sandboxes test file and returns verdict within SLA
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- Impersonation Protect flags test BEC email impersonating VIP
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- Internal Email Protect detects test lateral phishing scenario
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- Pre-delivery hold catches weaponized URL before reaching inbox
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- False positive rate below organizational threshold after tuning
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