MalwareTips
Threat LensFile scan report

Is OInstall.exe safe?

Verdict
Malicious

KMSAuto hacktool identification is strongly corroborated by 52 of 74 engines, while runtime evidence shows attempts to create Windows Defender exclusions.

The sample is a confirmed KMSAuto activation hacktool, identified by 52 of 74 engines and multiple high-trust products. A completed sandbox run also recorded commands attempting to exclude temporary payload paths from Windows Defender, so it should not be executed or allowed through endpoint protection.

Do not run this file

Quarantine and remove this file, and keep all endpoint protection enabled. If it was executed, review Windows Defender exclusions and scan the system for KMS persistence, temporary payloads, and unauthorized software changes.

Read the full analysis
Saved file evidenceAntivirus consensus
52of 74 flagged
Flagged 52No detection 22
Digital specimenOInstall.exe6c256b70d4b68b25a7…32d8fd25b9a1d9
Size11.0 MB
Code signingSigner not verified
SandboxRuntime complete
First seen5y ago
Evidence3 priority signals
2 high-confidence signature or behavior rules matched this file.

Recommended next actions

01

Before running

Do not run it. Delete this file from the device, then empty the Recycle Bin or Trash.

02

If you already ran 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.

MT AI Engine · Verdict analysis

The reasoning behind this verdict

This section explains the evidence supporting the verdict and keeps conflicting or missing signals visible.

99%Confidence
Very high
Analyst conclusion

The sample is a confirmed KMSAuto activation hacktool, identified by 52 of 74 engines and multiple high-trust products. A completed sandbox run also recorded commands attempting to exclude temporary payload paths from Windows Defender, so it should not be executed or allowed through endpoint protection.

Where this verdict could be wrong5 caveats
  • behaviour.hasMaliciousSandboxVerdict=false, although the completed run still recorded endpoint-protection exclusion attempts and five offensive techniques.
  • droppedChildren.hasMaliciousChild=false, but all 10 inspected child verdicts are unknown rather than confirmed clean.
  • externalIntel.yaraify.ruleCount=0 and externalIntel.circl.hit=false; these absences may reflect intelligence coverage gaps.
  • prevalence.classification=common_old with 108 sources and 127 submissions, indicating broad historical circulation rather than trustworthiness.
  • Two communityComments describe the activator as harmless, but both have zero votes and conflict with independently corroborated engine and runtime evidence.

These are the assessment's weak points. If you believe one applies to your file, report the verdict and we'll re-review it.

Recommended action

Quarantine and remove this file, and keep all endpoint protection enabled. If it was executed, review Windows Defender exclusions and scan the system for KMS persistence, temporary payloads, and unauthorized software changes.

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

    52 of 74 engines flagged the file.

  • Sandbox

    Complete

    1 isolated runtime environment contributed observations.

  • Network

    Partial

    20 runtime contacts were observed without a completed reputation cross-check.

  • YARA

    Complete

    5 signature or behavior rules 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
  • 41MITRE ATT&CK techniques
  • 15spawned processes
  • 20network contacts
  • 40filesystem & mutex artifacts

What this file does

Observed actions and their security significance

  • High concern: Created or modified a scheduled task, which can provide persistence.

  • 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: Used removable-media replication behaviour that can spread files between devices.

  • High concern: Changed an auto-start location that can make code run after sign-in or restart.

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

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

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 hacktools are abused

This is a hacking or cracking tool — the kind used to bypass software licences, generate fake keys, or attack other systems. Even when the tool 'works', these downloads very often carry hidden malware.

Bottom line:Running one means trusting an anonymous author with full access to your PC — rarely worth the risk.

Recorded behavior

Attack story

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

ObservedDerived

7 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 run this file. Delete this file from the device, then empty the Recycle Bin or Trash.

  2. Recovery step 02

    If you already ran 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

    Get a fresh copy from the developer's official site or an official app store.

Safety FAQ

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

9 evidence-based answers
Is OInstall.exe malware?
Evidence-based answer
Yes — OInstall.exe is malicious. Do not run it. Delete this file from the device, then empty the Recycle Bin or Trash. 52 of 74 antivirus engines flag it (family: KMSAuto). It behaves as a hacktool — dual-use offensive tooling that is dangerous regardless of intent. If you've already run it, see the removal and recovery steps below.
What is OInstall.exe?
Evidence-based answer
OInstall.exe is a Windows executable program, about 11 MB. Our analysis identifies it as malicious (family: KMSAuto) — a hacktool — dual-use offensive tooling that is dangerous regardless of intent. 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 OInstall.exe?
Evidence-based answer
52 of 74 antivirus engines flagged OInstall.exe, 52 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.
I already downloaded and ran OInstall.exe — what should I do?
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 OInstall.exe?
Evidence-based answer
To remove OInstall.exe: 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) Delete this file from the device, then empty the Recycle Bin or Trash. 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 OInstall.exe?
Evidence-based answer
OInstall.exe is classified as a hacktool — dual-use offensive tooling that is dangerous regardless of intent. Engines attribute it to the KMSAuto 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.
Is OInstall.exe digitally signed?
Evidence-based answer
OInstall.exe claims a signer of WZTeam, but the signature is not verified — an unverified or broken signature can be forged, so it should not be trusted as proof of who made the file.
What is the SHA-256 hash of OInstall.exe?
Evidence-based answer
The SHA-256 hash of OInstall.exe is 6c256b70d4b68b25a71efaf82e31ca91e009ddbcb3168cca1832d8fd25b9a1d9, and its MD5 is 4f52762f2a4935a4460b4e2004751adb. 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 OInstall.exe?
Evidence-based answer
This report reflects the scan run on September 10, 2026. Because a file's hash never changes, the identity of OInstall.exe 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.