### Overview
Following the compromised software update, we have observed Master Boot Record (MBR) overwriting activity. This is a destructive action characteristic of Sandworm's tactics.

### Key Indicators
- **MBR Modification**: Unauthorized changes to the MBR have been logged, leading to potential system boot failures.
- **System Recovery**: Attempts to recover the MBR have been partially successful, but full restoration is uncertain.

### Recommendations
- **Immediate System Backups**: Ensure that all critical data is backed up and secure.
- **Forensic Analysis**: Engage forensic teams to analyze the altered MBR and identify further threats.

### Next Steps
Given past Sandworm operations, expect potential credential harvesting as the next phase of the attack. Monitor for suspicious credential access activities.