Deep Security Anti-malware Driver Offline Not Installed — Trend Micro

Technical Analysis: Trend Micro Deep Security Anti-Malware Driver Status Offline

The "Driver offline / Not installed" status in Trend Micro Deep Security indicates a failure in the communication between the Deep Security Agent (DSA) and its core protection drivers. This issue typically prevents the Anti-Malware module from functioning, leaving the system vulnerable to threats. 1. Root Causes for Offline Driver Status

Anti-Malware: Driver offline / Not installed - Deep Security

When dealing with Trend Micro Deep Security, specifically when the anti-malware driver is not installed or not running properly (often referred to as being "offline"), there are several steps you can take to troubleshoot and potentially resolve the issue. Here’s a structured approach:

7. Conclusion

The “Trend Micro Deep Security Anti-Malware driver offline or not installed” state is a critical failure that disables file-based threat protection. It stems from missing files, registration errors, kernel signature enforcement, or software conflicts. Resolution requires systematic verification of driver presence, service registration, filter attachment, and event logs – often culminating in a feature reinstallation or full agent rebuild. For production environments, immediate remediation is essential to close the window of vulnerability.

Seeing the error "Anti-Malware Driver offline/Not installed" in Trend Micro Deep Security usually means the agent’s core protection module has failed to initialize or has been blocked. This status leaves your server vulnerable as the agent cannot monitor or block malicious activity. Why Is This Happening?

Corrupted Installation: The most common cause is a failed or incomplete installation of the Deep Security Agent (DSA) .

Missing Root Certificates: On Windows, the OS may lack the necessary CA certificates to verify the driver's digital signature, preventing it from loading.

Security Software Conflicts: Existing antivirus programs like Trend Micro OfficeScan or third-party AVs can block the DSA driver installation.

Secure Boot Issues: For Linux systems, Secure Boot may be enabled without the proper public key enrolled for the Trend Micro driver. How to Fix It (Step-by-Step) 1. The "Clean Slate" Method (Recommended)

Since corrupted files often cause this, a clean reinstall is usually the fastest fix. Deactivate the agent in the Deep Security Manager (DSM) .

Uninstall the Deep Security Agent from the affected machine. Re-activate : If the agent is deactivated or

Manual Cleanup: Open a Command Prompt as Admin and ensure these driver services are fully removed: sc delete tmactmon sc delete tmcomm sc delete tmevtmgr Reboot the server to clear remaining hooks. Reinstall the agent and reactivate it from the Manager. 2. Verify OS Environment

If a reinstall fails, the underlying OS might be blocking the driver:

Windows Updates: Ensure the server has the latest Microsoft root certificate updates so it can trust Trend Micro’s signed drivers.

Conflict Check: Remove any old OfficeScan/Apex One clients or third-party AV agents before installing Deep Security.

Secure Boot (Linux): If using Linux, either disable Secure Boot or enroll the Trend Micro public key. 3. Agentless Protection (VMware/NSX)

If you are seeing this error in a virtual environment using agentless protection:

Verify that Guest Introspection is installed and running in your vSphere/NSX environment .

Check that the VMware Tools are up to date and compatible with your Deep Security version.

For deeper troubleshooting, you can generate a Diagnostic Package from the Agent to send to Trend Micro Support .

Anti-Malware: Driver offline / Not installed - Deep Security

The "Anti-Malware Driver Offline/Not Installed" status in Trend Micro Deep Security indicates the agent is unable to communicate with its local anti-malware module or the driver itself is missing/failed TrendMicro Common Causes Installation Corruption Navigate to Control Panel &gt

: The initial installation was incomplete or files became corrupted. Certificate Issues

: Missing root certificates on Windows prevent digital signature verification for the driver. A specific conflict with Comodo certificates is also a known trigger. Security Conflicts

: Existing third-party antivirus software or older Trend Micro products (like OfficeScan) can block driver installation. Environment Features

: Secure Boot being enabled without the proper public key enrolled can block the driver from loading. VM Sleep States

: If a virtual machine enters standby or sleep mode, communication with the driver may be lost. TrendMicro Troubleshooting and Solutions 1. Basic Service and Status Checks Restart Services

: Attempt to restart the Trend Micro Deep Security Agent service first. For Linux, use sudo /etc/init.d/ds_agent restart Check Policies

: In the Deep Security Manager, verify that the Anti-Malware policy is actually turned for that specific computer. www.trendmicro.com

Anti-Malware: Driver offline / Not installed - Deep Security

6. Re-activate or Re-install Agent

Re-activate: If the agent is deactivated or seems to be in an offline state for a prolonged period, try reactivating it through the Deep Security Manager console.
Re-install: As a last resort, you may need to uninstall and then reinstall the Deep Security Agent.

3. Root Cause Analysis: Why Does This Happen?

The “offline” state is not a single failure but a symptom with several potential root causes, categorized below.

7. Verify System Compatibility and Conflicts

System Compatibility: Ensure that the Deep Security Agent is compatible with your operating system version.
Conflict with Other Security Software: Sometimes, other security software can interfere with Deep Security. Check if other security software is installed and consider temporarily disabling or uninstalling it to see if it resolves the issue.

9. Contact Trend Micro Support

Professional Assistance: If you've tried the above steps and the issue persists, it may be time to contact Trend Micro support. They can provide model-specific guidance and more in-depth troubleshooting.

When to Contact Trend Micro Support

Open a case if:

The driver remains offline after reinstalling the agent.
Event logs show a driver crash (blue screen or error code 0x0000007E).
Multiple workloads show the same issue after a patch Tuesday.

Provide them with:

dsa_support.log (located in %ProgramFiles%\Trend Micro\Deep Security Agent\diag)
Output of fltmc filters (to list active minifilter drivers)
Windows version and build number

Note: As of 2025–2026, Trend Micro has been migrating Deep Security capabilities into Vision One Workload Security. If you are on a very old version (e.g., Deep Security 12 or earlier), upgrading to a supported release may resolve persistent driver issues.

Subject: Troubleshooting Guide: Trend Micro Deep Security Anti-Malware Driver Offline/Not Installed

Issue Summary: You are encountering an issue where the Deep Security Anti-Malware (AM) driver is either missing, listed as "Offline," or fails to install on the target machine. This prevents the Real-Time Scan from functioning correctly.

Common Causes:

Software Conflicts: Remnants of previous antivirus software or existing endpoint protection are blocking the driver installation.
Corrupted Installation: The Deep Security Agent (DSA) installation package was incomplete or corrupted.
OS Compatibility: The driver version is incompatible with the operating system build (common after Windows upgrades).
Pending Reboot: A previous system change requires a reboot before new drivers can be loaded.

Resolution Steps:

Check for Conflicting Software: Ensure no other antivirus software is installed. Use the specific vendor's removal tool (e.g., McAfee, Symantec, or Sophos removal tools) to completely uninstall competing products. Reboot the machine.
Repair/Reinstall the Agent:
- Navigate to Control Panel > Programs and Features.
- Locate Trend Micro Deep Security Agent.
- Select Change and choose the Repair option.
- If repair fails, uninstall the agent completely, reboot, and deploy a fresh installer from the Deep Security Manager (DSM).
Verify Driver Status via CLI: Open a command prompt as Administrator and navigate to the Deep Security installation directory (typically C:\Program Files\Trend Micro\Deep Security Agent\). Run the following command to query the driver status:
```
dsa_control -m
```
Look for the Anti-Malware state. If it is disabled or shows an error code, attempt to force a re-activation via the command line:
```
dsa_control -r
```
Check System Logs: Examine the Windows Event Viewer under System and Application logs. Filter by source "ds_am" or "Trend Micro" to identify specific error codes related to the driver load failure.
Reboot the System: If the driver is stuck in an "Offline" state, a simple system reboot often resolves the issue by clearing locked files and initializing the driver load sequence correctly. uninstall the agent completely