SharpWSUS

SharpWSUS is a CSharp tool for lateral movement through WSUS. There is a corresponding blog (https://labs.nettitude.com/blog/introducing-sharpwsus/) which has more detailed information about the tooling, use case and detection.

Credits

Massive credit to the below resources that really did 90% of this for me. This tool is just an enhancement of the below for C2 reliability and flexibility.

  • https://github.com/AlsidOfficial/WSUSpendu – powershell tool for abusing WSUS
  • https://github.com/ThunderGunExpress/Thunder_Woosus – Csharp tool for abusing WSUS

Help Menu

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Phil Keeble @ Nettitude Red Team


Commands listed below have optional parameters in <>.

Locate the WSUS server:
SharpWSUS.exe locate

Inspect the WSUS server, enumerating clients, servers and existing groups:
SharpWSUS.exe inspect

Create an update (NOTE: The payload has to be a windows signed binary):
SharpWSUS.exe create /payload:[File location] /args:[Args for payload] </title:[Update title] /date:[YYYY-MM-DD] /kb:[KB on update] /rating:[Rating of update] /msrc:[MS RC] /description:[description] /url:[url]>

Approve an update:
SharpWSUS.exe approve /updateid:[UpdateGUID] /computername:[Computer to target] </groupname:[Group for computer to be added too] /approver:[Name of approver]>

Check status of an update:
SharpWSUS.exe check /updateid:[UpdateGUID] /computername:[Target FQDN]

Delete update and clean up groups added:
SharpWSUS.exe delete /updateid:[UpdateGUID] /computername:[Target FQDN] </groupname:[GroupName] /keepgroup>

Example Usage

Notes

  • Binary has to be windows signed, so psexec, msiexec, msbuild etc could be useful for lateral movement.
  • The metadata on the create command is not needed, but is useful for blending in to the environment.
  • If testing in a lab the first is usually quick, then each subsequent update will take a couple hours (this is due to how windows evaluates whether an update is installed already or not)
Download SharpWSUS

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