### Persistence via Backdoor Installation

Post-reconnaissance, it has been established that a sophisticated backdoor, likely derived from the Equation Group's 'Double Fantasy' malware, has been installed to maintain persistent access.

### Features of the Backdoor
- **Installation Method**: Leveraged privilege escalation vulnerabilities in ICS software.
- **Backdoor Name**: `doublefantasy.dll`
- **Communication**: Utilizes HTTPS for encrypted communications with C2.

### Recommendations
- Apply patches to all vulnerable ICS software.
- Enhance monitoring for unusual outbound HTTPS traffic.

### Next Steps
Prepare for potential lateral movement attempts exploiting ICS protocols.