Researchers at Guardicore have identified a new infection vector being used by the Perkiler malware where internet-facing Windows machines are breached through SMB password brute force. The most famous example of SMB-exploiting malware is WannaCry, which spread via an operation that hunted down vulnerable public facing SMB ports and then used the EternalBlue exploit to get on the network. The rootkit thats hidden inside the encrypted payload is to hide various registry keys and values, files, etc.”]
Source: https://blog.malwarebytes.com/trojans/2021/03/perkiler-malware-turns-to-smb-brute-force-to-spread/