Trend Micro Apex One™ as a Service "Bad Image" pop-up error

Product / Version includes:

Trend Vision One All , Apex One as a Service All

Last updated: 2025/10/09

Solution ID: KA-0021300

Category: Configure , Troubleshoot

Summary

Trend Micro has received reports of the following error message continuously popping up after receiving Apex One™ as a Service batch 2 updates.

“Regsvr32.exe - Bad Image
C:\WINDOWS\System32\tmmh\20019\AddOn\8.55.0.1399\TmUmEvt.dll is either not designed to run on Windows or it contains an error. Try installing the program again using the original installation media or contact your system administrator or the software vendor for support. Error status 0xc000012f."

Details

This issue is caused by having corrupted TmUmEvt.dll file on impacted endpoints.

How to Identify Affected Agents

Agent build version is 14.0.20315
Use PS Command: (Get-AuthenticodeSignature "C:\Windows\SysWOW64\tmumh\20019\AddOn\8.55.0.1399\TmUmEvt.dll").status
- Output return for affected machines: “UnknownError”
- Output return for non-affected machines: “Valid”

Workaround:

Check if C:\Program Files (x86)\Trend Micro\Security Agent\CCSF\module\20019\UMH\Helper\AddOn\tmumevt.dll has the Trend Micro signature

(right click on file > properties > digital signatures, check under embedded signatures) If it does:

Unload the Security Agent.
Then use the verified good copy from step 1 and replace the corrupted file at C:\Windows\SysWOW64\tmumh\20019\AddOn\8.55.0.1399\tmumevt.dll.
Reload agent.

Alternatively, a mitigation package is currently available internally to address the corrupted binary. Customers experiencing this issue can also contact support for assistance and deployment guidance.

To minimize potential impacts, deployment for Trend Micro Apex One as a Service Batch 2 is currently on hold for the following Data Center regions:

Southeast Asia
Southeast Asia (Korea)
Australia East
Japan

For support assistance, please contact Trend Micro Technical Support.

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Trend Micro Apex One™ as a Service "Bad Image" pop-up error

Trend Micro Apex One™ as a Service "Bad Image" pop-up error

Product / Version includes:

Summary