Communication Detection vs. Firmware Scanning
Last reviewed: · Reviewed by the BRIGHTCYTE technical team
Firmware scanning is an approach to firmware threats that inspects firmware images and stored code, verifying integrity against a known good reference or searching for known malicious indicators. Aligned with resiliency principles such as those in NIST SP 800-193, scanning can help confirm that firmware matches expectations and can support recovery to a trusted state.
What Firmware Scanning Does Well
Scanning can point toward a specific image or component when a known indicator or a clear integrity deviation is present. It is valuable for verification, auditing, and restoring firmware to a known good state. Its effectiveness depends on having reliable references or signatures for what it is checking against.
Where Scanning Reaches Its Limits
A novel implant or a compromise without a known signature may not stand out to a scan, especially if the attacker took care to preserve expected values. Scanning is also a point-in-time check, so behavior that only appears during operation can fall outside its view. See our firmware security page for related concepts.
Side by Side
| Aspect | Firmware Scanning | Communication Detection |
|---|---|---|
| What it examines | Firmware images and stored code | Communication behavior over time |
| Relies on | Known indicators and integrity references | Suspicious patterns and hardware-level context |
| Against unknown implants | May miss threats without a known signature or baseline | May still surface behavior that looks anomalous |
| Result | Can point toward a specific image or component | Provides a signal that something communicates covertly |
When to Combine Them
Use firmware scanning for verification and recovery, and use communication detection to watch for suspicious behavior over time. Together they cover both the state of firmware and how components actually behave once running.
What BRIGHTCYTE Can and Cannot Conclude
BRIGHTCYTE detects suspicious communication behavior and provides an additional signal that may indicate a compromise below the operating system. It does not scan or repair firmware, does not by itself always identify the precise compromised component, and detection is not guaranteed.
Frequently Asked Questions
- What is firmware scanning?
- Firmware scanning examines firmware images and stored code to check integrity or to look for known malicious indicators. Approaches aligned with NIST SP 800-193 verify firmware against a known good reference and can support recovery.
- How is communication detection different?
- Communication detection does not inspect firmware images. It analyzes communication behavior with the assumption that a source may be hiding below the operating system, providing an additional signal when a component appears to communicate covertly.
- Which approach should we use?
- They are complementary. Scanning can point toward a specific component and support recovery, while communication detection may surface suspicious behavior even without a known indicator. BRIGHTCYTE focuses on detection and does not scan or repair firmware, and detection is not guaranteed.
Sources and Further Reading
NIST · 2018
NIST SP 800-193: Platform Firmware Resiliency GuidelinesDescribes firmware integrity verification and recovery, the foundation of scanning-based approaches.
MITRE ATT&CK
MITRE ATT&CK: Firmware Corruption (T1495)Illustrates why firmware integrity and firmware-level behavior both matter to defenders.