Malware Removal & Assembly Analysis of Legacy Keygen

I have a legacy Keygen for a critical Windows application that needs urgent attention. This Keygen has been flagged as malicious by 18 out of 57 security vendors on VirusTotal.com. See the report here:
https://www.virustotal.com/gui/file/d15c4bdc1f27e791037b9f8e164ddff4f7445d47bf9ad629610bb20600f29204

The primary goal of this task is to remove the malware present in the Keygen and restore its proper license validation functionality. Ensuring the Keygen's ability to validate licenses tied to a specific PC is crucial for this task.

Ideal Skills and Experience:
- Extensive knowledge of assembly language for binary analysis
- Proven experience in malware removal
- Proficiency in using a disassembler, debugger, and hex editor
- Ability to ensure system security while restoring functionality
- Familiarity with Keygens and license validation systems

The task does not involve improving the Keygen's performance, but rather ensuring its security and functionality. I have not yet used any specific tools on this Keygen, so your expertise will be crucial in analyzing and addressing the issues.