EchoTrail

ie4uinit.exe

by Microsoft
Operating SystemLOLBinhigh risk

Sources: 300M+ executions observed in the wild.

Summary

Internet Explorer Per-User Initialization utility - configures IE settings during user profile setup. Can be abused to execute commands.

ie4uinit.exe is the 809th most commonly executed Windows program in EchoTrail's dataset, observed 3,800 times across enterprise environments. It typically runs from C:\Windows\System32 and it is most often launched by explorer.exe.

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809th
most commonly executed Windows program
3,800
observed endpoint executions

Behavior

Top Paths

  • C:\Windows\System32100%

Top Hashes (SHA256)

  • d8e6eb5f16ad51c5bff6703ac48f1cf3195d413e110ff6922971af4702ad1b0910.57%
  • fbd20a4570d371aab492ed2c7d90a97bf02f40925fdf8cb71201a55ff3d7ff3c8.46%
  • 5adc2de49ea5c0ff5c2c83ae33861146b12db73cacc81635eefcdf8afbf79aab6.41%
  • bbacef5035aa8142f9146456b4fe0fc1f98d8f6c7560de0635afe0cc41c410f65.23%
  • a97be066a1d5a7188e853fff3582ce9fd6c66ace9517f921f9fa738c1be2a4eb4.03%
  • 6f83621ed34b61ca0bbaff5a5fd158feeca364de52eec38e1cc2295a82a7bd5c4%
  • f9cdc96f5f45e0cea5311be2e09a54747db8cc3638d9de520227ba71b2c791e53.9%
  • f10a22e0c51a64f442ba61efbb44af12fdf3b2b74875276535d4fc786ea4a5a43.74%
  • 8e8c4a1402e0af960ab1ff23c8925bbc35b0f015537056ce5c51658519de41bb3.47%
  • a71c86d4b5eea233470918d25aba1fba8507dfc441b79e714da8fb48885e137c3.34%

Code Signing

Signers by share of executions

  • Microsoft WindowsValid
    Catalog signed · 1 hash
    100%
    Chain
    1. Microsoft Windows
    2. Microsoft Windows Production PCA 2011
    3. Microsoft Root Certificate Authority 2010
    Valid
    • Apr 16, 2026 to Oct 17, 2026
    Hashes
    • ba25de1dd0b21ad45f0102b7c2546c12f16c309fd258deb8abbef668632f8207100% of executions, first seen Sep 16, 2026

Full certificate detail on Team.

Process Ancestry

Top Grandparents

Top Parents

Top Children

Security Analysis

What does ie4uinit.exe normally do?

Runs during new user profile initialization to set up IE defaults. Rarely seen on modern systems after initial profile creation.

When is ie4uinit.exe suspicious?

Running with -BaseSettings flag. Execution on established user profiles (not first logon). Spawning child processes.

How do attackers abuse ie4uinit.exe?

ie4uinit.exe -BaseSettings can be tricked into loading a malicious .inf file to execute arbitrary commands. Used as a signed proxy for execution in LOLBin attacks.

Detection guidance

Alert on ie4uinit.exe execution outside of new user profile creation. Monitor for -BaseSettings flag usage. Detect child process spawning.

False positive notes

New user profile initialization on first logon.

MITRE ATT&CK techniques

T1218

References

Related Processes

runonce.exe

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