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efsutil.dll

efsutil.dll — Sideloading, Environment Variable hijacking (Microsoft)

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efsutil.dll
efsutil.dll

Sandbox: execFile · Timeout: 30s

Capabilities

security.defenseevasion.dll-hijack

Documentation

examples:

  • description: "Place malicious efsutil.dll in the search order location" command: "copy malicious.dll "%SYSTEM32%\efsutil.dll""
  • description: "Execute the vulnerable binary to trigger the hijack" command: ""%SYSTEM32%\cipher.exe""

efsutil.dll

Vendor: Microsoft

Expected Location: %SYSTEM32%

Vulnerable Executables:

  • %SYSTEM32%\cipher.exe (Sideloading)
  • %SYSTEM32%\efsui.exe (Sideloading)
  • %SYSTEM32%\rekeywiz.exe (Sideloading)
  • %SYSTEM32%\filehistory.exe (Environment Variable)

Acknowledgement: Wietze

References