### Summary
Following the detection of the spear-phishing campaign, it has been confirmed that the APT28 group successfully executed the X-Agent implant on compromised systems. 

### Details
- **Implant Functionality**: X-Agent is a modular backdoor capable of keystroke logging, file extraction, and remote access.
- **Execution Method**: The implant was delivered as a payload within the spear-phishing campaign, likely disguised as a legitimate document.

### Recommendations
- Verify the integrity of files and monitor for unusual process activity.
- Implement stricter email filtering and employee training on recognizing phishing attempts.