.. /Ie4uinit.exe

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Paths:

• c:\windows\system32\ie4uinit.exe
• c:\windows\sysWOW64\ie4uinit.exe
• c:\windows\system32\ieuinit.inf
• c:\windows\sysWOW64\ieuinit.inf

Resources:

• https://bohops.com/2018/03/10/leveraging-inf-sct-fetch-execute-techniques-for-bypass-evasion-persistence-part-2/

Acknowledgements:

• Jimmy (@bohops)

Detections:

• IOC: ie4uinit.exe copied outside of %windir%
• IOC: ie4uinit.exe loading an inf file (ieuinit.inf) from outside %windir%
• Sigma: https://github.com/SigmaHQ/sigma/blob/bea6f18d350d9c9fdc067f93dde0e9b11cc22dc2/rules/windows/process_creation/proc_creation_win_lolbin_ie4uinit.yml

Execute

1. Executes commands from a specially prepared ie4uinit.inf file.

   ie4uinit.exe -BaseSettings

   Use case

   Get code execution by copy files to another location

   Privileges required

   User

   Operating systems

   Windows vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 11

   ATT&CK® technique

   T1218