The BOF WinRM Client is a Beacon Object File (BOF) extension for Cobalt Strike that provides a lightweight and stealthy way to interact with the Windows Remote Management (WinRM) service.
This tool enables operators to execute commands on remote systems using WinRM without creating persistent sessions or relying on external tools like PowerShell, which can trigger security alerts.
beacon> winrm-client --host ws2 --cmd "whoami" This returns the output of the command executed on the remote system, such as identifying the current user context.
The BOF WinRM Client was developed to address gaps in Cobalt Strike’s native capabilities for interacting with WinRM.
It is especially useful in scenarios where high-privileged tokens are available but traditional methods, such as Pass-the-Hash or PowerShell-based tools, are too risky due to detection concerns.
In conclusion, the BOF WinRM Client is a powerful addition to Cobalt Strike’s arsenal, offering stealthy and efficient command execution over WinRM.
It is particularly valuable for lateral movement during penetration tests or red team engagements while maintaining operational security (OpSec).
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