Overwatch from HackTheBox features anonymous SMB, .NET reverse engineering, MSSQL linked server abuse with AD-integrated DNS to capture cleartext credentials via Responder, and a PowerShell command injection in a WCF service for SYSTEM.
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HTB: Overwatch
Overwatch starts with anonymous SMB access to a software share that hosts a custom .NET monitoring binary. I’ll reverse engineer it to recover SQL Server credentials and identify a WCF service with a PowerShell command injection sink. With the SQL creds, I’ll find a linked server pointing to a non-resolving host and abuse CREATE_CHILD on the AD-integrated DNS zone to add a record pointing the hostname at my host, capturing cleartext SQL authentication with Responder when the linked server connects out. Those credentials provide WinRM as a user in Remote Management Users. From there, I’ll exploit the WCF KillProcess command injection on a localhost SOAP endpoint to get code execution as SYSTEM, demonstrating four different ways to interact with the WCF service. In Beyond Root, I’ll look at a log that captured the Windows Administrator password from an HTB pre-release cleanup script.