Ransomware
NailaoLocker
According to Orange Cybwerdefense, NailaoLocker is a ransomware using AES-256-CTR mode, which conveniently logs its encryption activities into a log file.
NailaoLocker is a Windows ransomware.
Background
Per Orange Cyberdefense, NailaoLocker is a ransomware family that encrypts with AES-256-CTR mode and helpfully records its encryption operations to a log file.
Source: Malpedia (Fraunhofer FKIE).