TrendAI Vision One™ - Endpoint Security and TrendAI 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: 2026/02/27

Solution ID: KA-0021300

Category: Configure , Troubleshoot

Summary

TrendAI™ has received reports of the following error message continuously popping up after the recently deployed TrendAI Vision One - Endpoint Security and 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.

Issue Mitigation

TrendAI has completed the deployment of a backend recovery command to resolve the corrupted DLL issue impacting customers on the October release.

To minimize potential impacts, deployment for Apex One as a Service October Batch 2 & 3 were cancelled.

We recommend keeping agent updates disabled until the release of Apex One as a Service – November update. You can find the release schedule here.

Please continue to monitor your environment, and if you experience any further issues or have questions, don’t hesitate to contact TrendAI Technical Support for assistance.

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TrendAI Vision One™ - Endpoint Security and TrendAI Apex One™ as a Service "Bad Image" pop-up error

Issue Mitigation

TrendAI Vision One™ - Endpoint Security and TrendAI Apex One™ as a Service "Bad Image" pop-up error

Product / Version includes:

Summary

Issue Mitigation