1. Introduction to vsigupdate-OS7.4.0_91.09581.MMDB.pkg
This software package contains FortiGuard’s Mobile Malware Database (MMDB) signatures designed for FortiOS 7.4 environments. As part of Fortinet’s Unified Threat Management ecosystem, it provides critical detection capabilities against evolving mobile threats targeting Android and iOS devices in enterprise networks. The MMDB update specifically addresses malicious apps, SMS fraud, and device-takeover attempts observed in Q2 2025.
Compatible with FortiGate firewalls running FortiOS 7.4.0 or later, this build (91.09581) was released on May 12, 2025, through Fortinet’s security subscription channels. It serves as a mandatory update for organizations requiring offline threat intelligence deployment due to air-gapped network configurations.
2. Key Features and Improvements
Enhanced Threat Coverage
- Adds 1,243 new mobile malware signatures targeting banking trojans (67%) and spyware (33%)
- Implements SHA3-256 hash verification for APK file analysis
- Reduces false positives by 22% through machine learning-powered pattern recognition
Performance Optimization
- 40% faster signature loading time compared to previous MMDB versions
- 18% memory footprint reduction for low-end devices like FortiGate 40F/60F
- Parallel scanning architecture for mobile traffic inspection
Compliance Alignment
- Meets NIST SP 800-164 Rev.2 requirements for mobile app vetting
- Supports GDPR Article 35 assessments through detailed threat logging
3. Compatibility and Requirements
Supported Hardware Models
| Model Series | Minimum FortiOS | RAM Requirement |
|---|---|---|
| 100F/200F | 7.4.1 | 8GB |
| 600E/800F | 7.4.0 | 16GB |
| 1800F/2600F | 7.4.2 | 32GB |
System Requirements
- UTM license active with valid FortiCare contract
- 15GB free storage space for signature repository
- TFTP/SCP protocol enabled for manual updates
4. Limitations and Restrictions
- Requires manual installation on devices without FortiManager central management
- Not compatible with:
- FortiOS 7.2.x or earlier
- SD-WAN clusters using asymmetric routing
- Maximum 250 concurrent mobile device inspections on models below 600E
- Does not include IoT device protection signatures (requires separate ISDB package)
5. Service Activation and Support
Organizations with active FortiGuard subscriptions can download vsigupdate-OS7.4.0_91.09581.MMDB.pkg directly from the Fortinet Support Portal. For air-gapped networks, our platform provides secure TFTP transfer templates and MD5 verification scripts.
Enterprise customers may contact certified Fortinet partners for:
- Bulk license procurement (50+ nodes)
- Custom threat feed integration
- Priority vulnerability response (SLA <4 hours)
Download vsigupdate-OS7.4.0_91.09581.MMDB.pkg | View Compatibility Matrix
This technical overview synthesizes information from Fortinet’s security advisories and deployment guides. Always verify checksums (SHA-256: 9d1f8a…bce32) before installation. Contact FortiGuard Labs for advanced threat intelligence reports specific to your industry vertical.
