### Summary
Post-execution of the X-Agent implant, APT28 has established a persistent backdoor using X-Tunnel.

### Details
- **Backdoor Capabilities**: X-Tunnel enables encrypted communications, facilitating data exfiltration and further control over the network.
- **Persistence Mechanism**: X-Tunnel is configured to start automatically, allowing continued access even after system reboots.

### Recommendations
- Analyze network traffic for anomalous encrypted connections.
- Consider network segmentation to limit lateral movement.