MalwareTips
Threat LensFile scan report

Is winmm.dll safe?

Verdict
Malicious

Malicious file assessment

1 high-confidence signature or behavior rule matched this file.

Do not use this component

Do not use this component

Read the full analysis
Saved file evidenceAntivirus consensus
4of 74 flagged
Flagged 4No detection 70
Digital specimenwinmm.dll9d3ef6a094059657f2…43779891824074
Size65.0 KB
Code signingUnsigned
SandboxRuntime complete
First seenToday
Evidence3 priority signals
1 high-confidence signature or behavior rule matched this file.

Recommended next actions

01

Before using

Do not use it. Quarantine this component with your antivirus, then repair or reinstall the parent software from its official source. Do not delete or replace the component manually.

02

If you already used it

Disconnect from the internet, start a full or offline antivirus scan, then secure important accounts from a clean device.

Chapter 02

Intelligence

The saved assessment, checked against the scan evidence and recorded coverage.

No saved analyst narrative

This report keeps the verified scan facts available below without inventing an analysis that was not saved with the scan.

Scan transparency

Coverage & freshness

4 of 5 complete

Complete means the check returned a usable result. It does not mean the file is safe.

  • Antivirus

    Complete

    4 of 74 engines flagged the file.

  • Sandbox

    Complete

    1 isolated runtime environment contributed observations.

  • Network

    Not run

    No contacted-host reputation check is recorded.

    No timestamp recorded

  • YARA

    Complete

    1 signature or behavior rule matched.

  • External intel

    Complete

    3 of 3 independent reference sources completed.

Chapter 03

Behavior

Plain-English impact first, then the observed runtime evidence.

Runtime flight recorder

Capture complete
  • 1isolated sandbox run
  • 17MITRE ATT&CK techniques
  • 15spawned processes
  • 0network contacts
  • 31filesystem & mutex artifacts

What this file does

Observed actions and their security significance

  • High concern: Injected code into another process, a technique that can conceal execution.

  • High concern: Used an input-capture technique that can record credentials or keystrokes.

  • High concern: Attempted to impair or bypass security controls.

  • High concern: Manipulated how the operating system loads code, which can redirect execution.

  • Moderate concern: Contained obfuscated or packed code that makes inspection harder.

  • Moderate concern: Scans through your files and folders.

  • Moderate concern: Checked the environment for virtualisation or analysis tools.

These are observed capabilities from an isolated analysis. A technique does not prove malicious intent on its own, and the file never ran on your device.

Threat context

How downloaders work

This file is a delivery vehicle. On its own it can look small and harmless, but its job is to quietly pull down and install the REAL payload — often a stealer, ransomware, or bot — from a server the attacker controls.

Bottom line:Because the dangerous part arrives later, early scans can look cleaner than the threat really is.

Recorded behavior

Attack story

Runtime observations grouped by analysis stage. Arrows organize the stages; they do not claim chronology or causality.

ObservedDerived

5 recorded facts from one runtime window. Every fact remains independently traceable in Analyst mode.

Chapter 04

Detection & Forensics

Consensus, attribution, signatures, code structure, prevalence, and identity.

Chapter 05

Safety & FAQ

Complete recovery guidance and answers for the next decision.

What to do now

This file is dangerous. Treat it as harmful and remove it.

  1. Recovery step 01

    Don't use this component. Quarantine this component with your antivirus, then repair or reinstall the parent software from its official source. Do not delete or replace the component manually.

  2. Recovery step 02

    If you already used it, disconnect from the internet and start with a full antivirus scan or Microsoft Defender Offline scan. If compromise is suspected or the problem persists, use a reputable second-opinion scanner and follow incident-recovery or clean-reinstall guidance.

  3. Recovery step 03

    From a different, clean device, change the passwords on your important accounts (email and banking first) and turn on two-factor authentication.

  4. Recovery step 04

    Reinstall the parent software from the developer's official site instead of replacing this component by itself.

Safety FAQ

Direct answers grounded in the saved verdict and evidence in this report.

8 evidence-based answers
Is winmm.dll a virus?
Evidence-based answer
Yes — winmm.dll is malicious. Do not use it. Quarantine this component with your antivirus, then repair or reinstall the parent software from its official source. Do not delete or replace the component manually. 4 of 74 antivirus engines flag it (family: downloader). It behaves as a downloader/dropper whose job is to pull additional malware onto the device. If you've already used it, see the removal and recovery steps below.
What is winmm.dll?
Evidence-based answer
winmm.dll is a Windows library or loadable module, about 65 KB. Our analysis identifies it as malicious (family: downloader) — a downloader/dropper whose job is to pull additional malware onto the device. Because a file's name and icon can be faked, the safest way to identify it is by its cryptographic hash (below), not its filename.
How many antivirus engines detected winmm.dll?
Evidence-based answer
4 of 74 antivirus engines flagged winmm.dll, 4 of them as outright malicious. The raw count alone does not establish safety or danger; we also weigh which engines flagged it and corroborating behavior, identity, reputation, and rule evidence. The malicious verdict comes from the complete saved evidence, not from this antivirus count by itself.
What should I do if I already used winmm.dll?
Evidence-based answer
Act quickly. 1) Disconnect the device from the internet to stop the malware communicating or spreading. 2) Run a full scan with reputable anti-malware software (such as Malwarebytes) and quarantine everything it finds. 3) Change your important passwords from a DIFFERENT, clean device — many threats log keystrokes or steal saved credentials. 4) If you bank or shop on this device, watch closely for fraud and alert your bank. 5) For a confirmed infection, the most reliable fix is to back up your personal files and reinstall the operating system for a clean start.
How do I remove winmm.dll?
Evidence-based answer
To remove winmm.dll: 1) restart into Safe Mode (Safe Mode with Networking if you need to download a tool) so the malware doesn't auto-start. 2) Run a full scan with reputable anti-malware software and let it quarantine or delete the detections. 3) Quarantine this component with your antivirus, then repair or reinstall the parent software from its official source. Do not delete or replace the component manually. 4) Check your browser extensions, startup items, and scheduled tasks for anything unfamiliar. 5) Reboot and scan again to confirm it's gone. If detections keep coming back, a clean operating-system reinstall is the most dependable cure.
What kind of malware is winmm.dll?
Evidence-based answer
winmm.dll is classified as a downloader/dropper whose job is to pull additional malware onto the device. Engines attribute it to the downloader family. Knowing the family matters because it tells you the likely impact — data theft, remote control, file encryption, or unwanted ads — and guides the cleanup.
What is the SHA-256 hash of winmm.dll?
Evidence-based answer
The SHA-256 hash of winmm.dll is 9d3ef6a094059657f2e3a9d51df635f513e24f7aa56d34a4b243779891824074, and its MD5 is 3f316e111a5452ab6b6936f26fdd28c2. This hash is the file's unique fingerprint — two files with the same SHA-256 are identical. Use it to confirm you're looking at exactly this file (not just one with the same name) when comparing against antivirus databases or a download's published checksum.
How up to date is this analysis of winmm.dll?
Evidence-based answer
This report reflects the scan run on July 2, 2026. Because a file's hash never changes, the identity of winmm.dll is fixed — but antivirus coverage improves over time, so a file that looks clean today can pick up detections later (and vice-versa). If you need the latest picture, MalwareTips staff can re-run the analysis from scratch.
Chapter 06

Community

Member reviews and reports for this exact file hash.

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The raw file is processed temporarily and is not retained after processing. Its hash and report are public and permanent, so the next person who checks the same file gets an instant answer. Unknown files may be submitted to VirusTotal for analysis. If you ran this file on your computer and are worried, scan your system with an up-to-date antivirus and change critical passwords from a different device.