WantToCry Ransomware SMB Brute Force Remote Encryption | MSSP Advisory

WantToCry ransomware exploits exposed SMB ports through brute force attacks to establish lateral network access and perform remote encryption of files on compromised systems. The attack leverages the 1.5 million exposed SMB ports discovered across internet-facing systems to gain initial access and propagate through victim networks. The ransomware executes encryption operations remotely rather than deploying traditional on-disk payloads, making detection significantly more difficult.

Your RMM and remote access tools likely traverse SMB for network discovery and file transfers, making your infrastructure a potential attack vector if any client networks have exposed SMB ports. When this hits a client environment, they will expect you to have known about the 1.5 million exposed SMB ports and advised them accordingly, especially since many clients still run legacy Windows systems with default SMB configurations.

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