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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteFor a Windows PC, start with current Microsoft Defender Antivirus, then consider Microsoft Safety Scanner as an additional removal check. Malwarebytes also documents a practical RAT-remediation workflow. None of the cited sources, however, provides an independent head-to-head test proving that one scanner detects more remote-access trojans (RATs) than the others. Treat these tools as layers, not as a guarantee that every unauthorized remote session will be found.
That limitation matters because attackers can abuse legitimate remote-access software. The software may look normal to antivirus and endpoint tools, even when someone is using it to control a device. A scan is therefore one part of an investigation, not the whole answer.
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What a remote-access trojan can do
A remote-access trojan is malware that gives an attacker covert access to a victim’s device. Malwarebytes describes RAT capabilities that can include surveillance, changing settings, browsing or copying files, monitoring behavior and collecting information. Depending on what the attacker reaches, personal documents, account credentials and other sensitive data may be exposed.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchRATs are not static. Malwarebytes says their authors continually change them to frustrate detection mechanisms. That is one reason a scanner’s result is evidence about the files and indicators it examined at that time, rather than proof that a computer has never been compromised.
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The practical consequence is that detection and recovery are separate jobs. A scanner may identify a malicious executable, remove a related registry modification or quarantine a component, but it cannot by itself tell you whether passwords were copied, whether another computer is infected or whether an approved remote-support program was used improperly.
Which scanners have source-supported roles?
The available guidance supports three practical Windows options, but it does not establish a ranking. Their roles are different, so choosing one depends on whether you need ongoing protection, an on-demand removal check or a vendor-documented remediation path.
| Scanner | Role described by the source | What the guidance establishes | Important limit |
|---|---|---|---|
| Microsoft Defender Antivirus | Built-in, ongoing antivirus protection for Windows 10 and Windows 11 | Microsoft lists it as free software for detecting or removing trojans. | The guidance does not say it is the top RAT detector or provide a comparative detection rate. |
| Microsoft Safety Scanner | On-demand detection and removal aid | Microsoft says it helps remove malicious software and lists it as a free option for detecting or removing trojans. | Microsoft explicitly says it does not replace an antimalware product. |
| Malwarebytes anti-malware product | Vendor-supported scan and RAT-remediation option | Malwarebytes recommends installing and running its product to help remove associated files and registry modifications. | This is vendor guidance, not an independent test or a guarantee that every RAT or unauthorized remote session will be found. |
Cost is straightforward for the two Microsoft choices in the cited guidance: Defender and Safety Scanner are identified as free Microsoft software. The supplied material does not establish a current Malwarebytes price, plan, trial length or licensing terms, so compare those details on the vendor’s current page rather than assuming a cost.
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Microsoft Defender Antivirus: the sensible baseline
For Windows 10 and Windows 11, Microsoft identifies Microsoft Defender Antivirus as free software that can detect or remove trojans. Because Microsoft describes Defender as antivirus protection rather than a one-time cleanup utility, it is the logical baseline for a machine that needs continuing protection.
When Defender is the right first step
- You use Windows 10 or Windows 11 and need a no-cost starting point.
- You want protection that remains in place instead of a scan you run only once.
- You need to check for ordinary file-based trojans before escalating to a more specialized investigation.
- You want one resident product to continue monitoring while you decide whether an additional scan is warranted.
Use the current Defender protection on the computer, allow it to update as Microsoft directs, and run a full check when a RAT is suspected. The exact scan labels and settings can change with Windows updates, so follow the options shown in your installed Windows Security experience rather than relying on an old screenshot or third-party script.
Before scanning, write down what prompted the investigation: an unfamiliar remote-access application, unexpected account activity, a security warning or a file detection. That context helps you distinguish a one-time file finding from continuing unauthorized access. Save the date, scan type and result, particularly if the device belongs to an employer or school.
What a clean Defender result means
A clean result means Defender did not identify a matching malicious file or behavior in the areas it examined. It does not establish that an attacker never had access, that a legitimate remote-access utility was not misused, or that an account has not been stolen. CISA and partner agencies warn that legitimate remote-access software can blend into normal activity and avoid ordinary antivirus, antimalware and endpoint-detection alerts.
Microsoft Safety Scanner: a second, on-demand removal check
Microsoft describes Safety Scanner as a tool that helps remove malicious software from computers and lists it alongside Defender for detecting or removing trojans. It is useful when you want an additional Microsoft scan focused on malware removal rather than relying only on the resident antivirus product.
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The non-replacement caveat
Microsoft’s prevention guidance includes this explicit warning: “This tool doesn’t replace your antimalware product.” In practical terms, Safety Scanner should supplement ongoing protection, not serve as the only security control on a computer that remains connected to the internet.
How to use it responsibly
- Obtain the current Safety Scanner release from Microsoft’s official distribution channel and confirm that it matches your Windows architecture and current instructions.
- Before scanning, save work and close applications that do not need to remain open. A removal scan may need to stop a process or request a restart.
- Run the scan mode appropriate to the suspicion, allowing the tool to complete rather than treating an early progress message as a result.
- Record any detection name, affected path and action taken. Keep the report if the computer is managed or if you need to explain the incident to an administrator.
- Restart when the tool requests it, then check whether the detection returns. A returning detection can indicate persistence, reinfection or another component that still needs investigation.
Safety Scanner is a removal aid, not an independent certification that a system is safe. A RAT that uses a legitimate remote-access program, a compromised account or an attacker-controlled service may require evidence outside a file scan.
Malwarebytes: vendor guidance for RAT remediation
Malwarebytes describes RATs as programs that can enable covert surveillance and unauthorized access. Its guidance recommends installing and running its anti-malware product to help mitigate a possible infection by removing associated files and registry modifications.
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The recommendation gives readers a practical remediation option, especially when a scan has already identified suspicious malware components. It does not demonstrate that Malwarebytes detects more RATs than Defender or Safety Scanner. The source is the vendor’s own guidance, not a controlled comparison using a defined RAT sample set.
Do not assume that installing several products creates additive certainty. Multiple scanners can produce overlapping detections, different names for the same component or conflicting cleanup actions. Use one documented sequence, retain reports and stop to seek help if the machine is managed or the suspicious activity continues.
Account protection after a finding
Malwarebytes advises changing usernames and passwords from a clean computer if a RAT is found. Do not perform that account reset from the suspected machine: a RAT may capture the new credentials as they are entered. Use a device you trust, prioritize email and administrative accounts, and notify an appropriate administrator when the computer belongs to an employer, school or other managed environment.
Changing credentials is a response to possible exposure, not proof that a scan removed every component. If a service offers session or token revocation, review those controls from the clean device as part of the account-protection process. Keep the suspected computer isolated until the responsible administrator decides it is safe to reconnect.
Why no scanner can promise to catch every RAT
The central detection problem is not only whether a malicious file is present. Attackers increasingly misuse legitimate remote-access products and features. CISA’s Guide to Securing Remote Access Software, published June 6, 2023, states: “Remote access software is often used for legitimate purposes, so it generally blends into the environment and does not trigger antivirus (AV), antimalware, or endpoint detection and response (EDR) defenses.”
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That warning explains why a conventional malware scan can be clean while an unauthorized person still has access. A legitimate utility may be installed by an attacker, started with stolen credentials, or used through an account that appears valid. The activity can resemble ordinary technical support rather than a file-based trojan.
Threats a file scan may not answer
- Whether an approved remote-access application was used outside its authorized purpose.
- Whether a password or session token was stolen before the scan.
- Whether an attacker connected through an account that remains active.
- Whether another device on the network is the source of reinfection.
- Whether persistence exists in a service, scheduled task, browser session or account setting that the scanner did not classify as malware.
- Whether an apparently legitimate connection came from the expected technician, account, time and destination.
These questions require system history, account records, network telemetry or help from an administrator. Do not interpret “no threats found” as evidence that every one of them has been answered.
A practical scanning and response workflow
1. Decide whether the computer should remain online
If you see unexplained mouse movement, new remote-access software, unknown accounts, disabled security controls or other signs of active control, disconnect the computer from networks when doing so will not destroy evidence or violate an incident-response procedure. On a managed device, contact the organization’s administrator before making major changes. The goal is to limit further access while preserving information that may help determine what happened.
2. Run the resident protection first
Use the current Microsoft Defender protection on Windows 10 or 11 and complete a thorough scan. Note the time, result and any detection names. Do not uninstall the resident protection simply because you plan to run an additional scanner; Safety Scanner is specifically described as a supplement, not a replacement.
3. Add an on-demand removal check
Run the current Microsoft Safety Scanner when you need a separate removal check. Follow Microsoft’s current instructions, let the scan finish, and preserve its report. A second scan can provide another view of file-based malware, but two clean scans still do not rule out abuse of legitimate remote-access software.
4. Use Malwarebytes’ remediation guidance when appropriate
If a RAT or related malware is suspected, Malwarebytes recommends running its anti-malware product to remove associated files and registry modifications. Treat that recommendation as one remediation path, not as a comparative performance claim. If the computer is managed, coordinate with the security team before deleting artifacts they may need for investigation.
5. Protect accounts from a clean device
When a RAT is found, assume information accessible from the computer may have been exposed. From a separate, trusted device, change usernames and passwords as Malwarebytes recommends. Start with email, password-manager, financial, cloud-storage and administrator accounts. Revoke active sessions or tokens where the service supports that control, and enable stronger sign-in protection after the password changes.
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6. Notify the right administrator
Tell an employer, school, service provider or household administrator when the affected device is managed or shared. An administrator can determine whether other systems, accounts or remote-access tools were involved. Do not present a consumer scan as a complete incident report.
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How to choose among the supported options
Choose Defender for an ongoing baseline
Defender is the most straightforward starting point for a Windows 10 or Windows 11 user who needs free, continuing antivirus protection. It addresses ordinary trojan detection without requiring a separate one-time workflow.
Choose Safety Scanner for an additional removal check
Safety Scanner fits a situation in which Defender is already present and you want Microsoft’s separate on-demand tool to look for and remove malicious software. Keep Microsoft’s non-replacement warning attached to that choice.
Choose Malwarebytes when its remediation workflow fits the case
Malwarebytes’ documentation is useful when the concern is a RAT infection involving files and registry modifications, or when you need the vendor’s specific removal guidance. Its documentation does not justify calling it the overall winner.
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Compare roles, not unsupported scores
When evaluating products, ask whether the tool is intended for ongoing protection or a one-time check, what operating system it supports, whether it can remove the detected component and what report it produces. Also ask what the tool cannot observe: legitimate remote-access sessions, stolen credentials and activity on other devices are outside the promise of a basic file scan. The available sources do not provide a controlled benchmark, so a numerical detection-rate comparison would be misleading.
Escalate instead of stacking scanners indefinitely
Running additional scanners can be reasonable for a file-based malware question, but repeatedly adding products is not a substitute for investigation. If suspicious remote activity continues after scans, stop treating the problem as a simple detection contest and involve a qualified administrator or incident-response team.
What organizations need beyond consumer scanning
CISA’s guidance is aimed at securing remote-access software in environments where ordinary antivirus visibility is not enough. Related Microsoft 2026 guidance recommends measures including cloud-delivered protection, endpoint detection and response in block mode, and network egress filtering. These are organizational controls, not features that a consumer can assume are provided by a one-time scanner.
Organizations should inventory approved remote-access tools, restrict who may install or use them, monitor unusual connections and retain the telemetry needed to distinguish legitimate support from abuse. If a remote-access utility is authorized, its presence alone is not proof of infection; the question is whether its use matches policy, user, time and destination.
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Common mistakes to avoid
- Calling a clean scan a clean bill of health. It only describes what the scanner examined and recognized.
- Using Safety Scanner as the sole protection. Microsoft expressly says it does not replace an antimalware product.
- Changing passwords on the suspected computer. Use a clean device because a RAT may capture the replacement credentials.
- Assuming a legitimate remote-access application is harmless. CISA warns that such software can be co-opted and blend into normal activity.
- Claiming one product is proven best. The cited material contains no independent, apples-to-apples RAT benchmark.
- Ignoring the organization’s response process. Managed systems may require administrator approval and evidence preservation.
What the evidence can—and cannot—support
The cited guidance supports naming Microsoft Defender Antivirus, Microsoft Safety Scanner and Malwarebytes as practical options. It supports describing RAT capabilities, recommending password changes from a clean device after a finding, and escalating to an administrator when appropriate. It does not provide an independent, current, apples-to-apples benchmark against a defined RAT sample set.
Accordingly, there is no defensible detection-rate table or definitive winner here. Product behavior, supported Windows versions and instructions can change, so verify the current documentation before downloading or running a tool. The safest conclusion is role-based: Defender for the baseline, Safety Scanner for an additional Microsoft removal check, Malwarebytes for its vendor-documented remediation path, and administrative investigation whenever legitimate remote-access software may have been abused.
Frequently Asked Questions
Can a virus scanner detect a remote-access trojan?
It can detect many file-based trojans, and Microsoft identifies Defender and Safety Scanner as tools for detecting or removing trojans. However, a clean result cannot rule out misuse of legitimate remote-access software, stolen credentials or an active unauthorized session.
Which free scanner should I try first on Windows?
Microsoft identifies Defender Antivirus for Windows 10 and 11 as free ongoing protection. Safety Scanner is another free Microsoft option for an on-demand removal check, but Microsoft says it does not replace an antimalware product.
Is Microsoft Safety Scanner a replacement for Defender?
No. Microsoft explicitly says Safety Scanner helps remove malicious software but does not replace your antimalware product. Use it as a supplemental check, not as the only protection.
Does Malwarebytes guarantee RAT removal?
No guarantee is established. Malwarebytes recommends running its anti-malware product to help remove associated files and registry modifications, but that is vendor guidance rather than an independent comparative test.
What should I do if a scanner finds a RAT?
Treat accessible information as potentially exposed. Disconnect or isolate the device according to your circumstances, change usernames and passwords from a clean computer, and notify the appropriate administrator for a managed system.
Can two clean scans prove that my computer is safe?
No. Two scans may reduce concern about file-based malware, but they cannot prove that a legitimate remote-access tool was not abused, that credentials were not stolen or that another device is not involved.
Should I run a scanner on a work or school computer?
Follow the organization’s incident-response process first. Contact the administrator, preserve scan reports and avoid deleting artifacts that may be needed to determine how far the incident reached.
The Bottom Line
Bottom line: Use Microsoft Defender Antivirus as the free Windows baseline, consider Microsoft Safety Scanner for a separate removal check, and follow Malwarebytes’ documented remediation advice when appropriate. None is proven the universal best RAT detector, and none can guarantee that legitimate remote-access software or stolen accounts were not abused. A confirmed finding requires clean-device password changes and, for managed systems, administrator-led investigation.
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