### Overview
Following the successful execution of exploit code, APT3 establishes persistence within the compromised network. This involves deploying a custom backdoor that allows continuous access to the target.

### Backdoor Characteristics
- **File Name:** Varies per deployment, often masquerading as legitimate system files.
- **Communication Protocols:** Utilizes HTTP or HTTPS to communicate with command-and-control (C2) servers.

### Detection and Response
- Conduct regular checks for unauthorized system modifications.
- Implement endpoint detection and response (EDR) solutions to identify unusual behaviors.

### Next Steps
Prepare for possible lateral movement activities as APT3 attempts to expand its foothold within the network.