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Microsoft aims to provide a delightful and productive Windows experience by working to ensure you're safe and in control of your devices. Microsoft helps protect you from potential threats by identifying and analyzing software and online content. When you download, install, and run software, we check the reputation of downloaded programs and ensure you're protected against known threats. You are also warned about software that is unknown to us.
You can assist Microsoft by submitting unknown or suspicious software for analysis. This will help ensure that unknown or suspicious software is scanned by our system to start establishing reputation. Learn more about submitting files for analysis
The next sections provide an overview of the classifications we use for applications and the types of behaviors that lead to that classification.
New forms of malware and potentially unwanted applications are being developed and distributed rapidly. The following list may not be comprehensive, and Microsoft reserves the right to adjust, expand, and update these without prior notice or announcement.
Unknown – Unrecognized software
- Trojan.Agent is Malwarebytes’ generic detection name for Trojans. It is used for detections that are either associated with no specific malware families or not enough information is available to pinpoint the malware family. Often, you will see it paired with other detections as parts of an infection that goes beyond a single family.
- Trojan.Downloader is Malwarebytes’ generic detection name for Trojans that download (and run) other malware on affected systems. Type and source of infection Downloaders are often the first stage of infection from attacks from an exploit kit or a malicious email attachment.
Download Malwarebytes for your computer or mobile device. Whether you need cybersecurity for your home or your business, there's a version of Malwarebytes for you. Try our free virus scan and malware removal tool, then learn how Malwarebytes Premium can protect you from ransomwar.
No antivirus or protection technology is perfect. It takes time to identify and block malicious sites and applications, or trust newly released programs and certificates. With almost 2 billion websites on the internet and software continuously updated and released, it's impossible to have information about every single site and program.
Think of Unknown/Uncommonly downloaded warnings as an early warning system for potentially undetected malware. There's generally a delay from the time new malware is released until it's identified. Not all uncommon programs are malicious, but the risk in the unknown category is much higher for the typical user. Warnings for unknown software aren't blocks. Users can choose to download and run the application normally if they wish to.
Once enough data is gathered, Microsoft's security solutions can make a determination. Either no threats are found, or an application or software is categorized as malware or potentially unwanted software.
Malware is the overarching name for applications and other code, like software, that Microsoft classifies more granularly as malicious software or unwanted software.
Malicious software is an application or code that compromises user security. Malicious software may steal your personal information, lock your device until you pay a ransom, use your device to send spam, or download other malicious software. In general, malicious software wants to trick, cheat, or defrauds users, placing them in vulnerable states.
Microsoft classifies most malicious software into one of the following categories:
Backdoor: A type of malware that gives malicious hackers remote access to and control of your device.
Downloader: A type of malware that downloads other malware onto your device. It must connect to the internet to download files.
Dropper: A type of malware that installs other malware files onto your device. Unlike a downloader, a dropper doesn't have to connect to the internet to drop malicious files. The dropped files are typically embedded in the dropper itself.
Exploit: A piece of code that uses software vulnerabilities to gain access to your device and perform other tasks, such as installing malware. See more information about exploits.
Hacktool: A type of tool that can be used to gain unauthorized access to your device.
Macro virus: A type of malware that spreads through infected documents, such as Microsoft Word or Excel documents. The virus is run when you open an infected document.
Obfuscator: A type of malware that hides its code and purpose, making it more difficult for security software to detect or remove.
Password stealer: A type of malware that gathers your personal information, such as usernames and passwords. It often works along with a keylogger, which collects and sends information about the keys you press and websites you visit.
Ransomware: A type of malware that encrypts your files or makes other modifications that can prevent you from using your device. It then displays a ransom note that states you must pay money or perform other actions before you can use your device again. See more information about ransomware.
Rogue security software: Malware that pretends to be security software but doesn't provide any protection. This type of malware usually displays alerts about nonexistent threats on your device. It also tries to convince you to pay for its services.
Trojan: A type of malware that attempts to appear harmless. Unlike a virus or a worm, a trojan doesn't spread by itself. Instead, it tries to look legitimate to tricks users into downloading and installing it. Once installed, trojans perform various malicious activities such as stealing personal information, downloading other malware, or giving attackers access to your device.
Trojan clicker: A type of trojan that automatically clicks buttons or similar controls on websites or applications. Attackers can use this trojan to click on online advertisements. These clicks can skew online polls or other tracking systems and can even install applications on your device.
Worm: A type of malware that spreads to other devices. Worms can spread through email, instant messaging, file sharing platforms, social networks, network shares, and removable drives. Sophisticated worms take advantage of software vulnerabilities to propagate.
Microsoft believes that you should have control over your Windows experience. Software running on Windows should keep you in control of your device through informed choices and accessible controls. Microsoft identifies software behaviors that ensure you stay in control. We classify software that doesn't fully demonstrate these behaviors as 'unwanted software'.
Lack of choice
You must be notified about what is happening on your device, including what software does and whether it's active.
Software that exhibits lack of choice might:
Fail to provide prominent notice about the behavior of the software and its purpose and intent.
Fail to clearly indicate when the software is active. It might also attempt to hide or disguise its presence.
Install, reinstall, or remove software without your permission, interaction, or consent.
Install other software without a clear indication of its relationship to the primary software.
Circumvent user consent dialogs from the browser or operating system.
Falsely claim to be software from Microsoft.
Software must not mislead or coerce you into making decisions about your device. It is considered behavior that limits your choices. In addition to the previous list, software that exhibits lack of choice might:
Display exaggerated claims about your device's health.
Make misleading or inaccurate claims about files, registry entries, or other items on your device.
Display claims in an alarming manner about your device's health and require payment or certain actions in exchange for fixing the purported issues.
Software that stores or transmits your activities or data must:
- Give you notice and get consent to do so. Software shouldn't include an option that configures it to hide activities associated with storing or transmitting your data.
Lack of control
You must be able to control software on your device. You must be able to start, stop, or otherwise revoke authorization to software.
Software that exhibits lack of control might:
Prevent or limit you from viewing or modifying browser features or settings.
Open browser windows without authorization.
Redirect web traffic without giving notice and getting consent.
Modify or manipulate webpage content without your consent.
Software that changes your browsing experience must only use the browser's supported extensibility model for installation, execution, disabling, or removal. Browsers that don't provide supported extensibility models are considered non-extensible and shouldn't be modified.
Installation and removal
You must be able to start, stop, or otherwise revoke authorization given to software. Software should obtain your consent before installing, and it must provide a clear and straightforward way for you to install, uninstall, or disable it.
Software that delivers poor installation experience might bundle or download other 'unwanted software' as classified by Microsoft.
Software that delivers poor removal experience might:
Present confusing or misleading prompts or pop-ups when you try to uninstall it.
Fail to use standard install/uninstall features, such as Add/Remove Programs.
Advertising and advertisements
Software that promotes a product or service outside of the software itself can interfere with your computing experience. You should have clear choice and control when installing software that presents advertisements.
The advertisements that are presented by software must:
Include an obvious way for users to close the advertisement. The act of closing the advertisement must not open another advertisement.
Include the name of the software that presented the advertisement.
The software that presents these advertisements must:
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- Provide a standard uninstall method for the software using the same name as shown in the advertisement it presents.
Advertisements shown to you must:
Be distinguishable from website content.
Not mislead, deceive, or confuse.
Not contain malicious code.
Not invoke a file download.
Microsoft maintains a worldwide network of analysts and intelligence systems where you can submit software for analysis. Your participation helps Microsoft identify new malware quickly. After analysis, Microsoft creates Security intelligence for software that meets the described criteria. This Security intelligence identifies the software as malware and are available to all users through Microsoft Defender Antivirus and other Microsoft antimalware solutions.
Potentially unwanted application (PUA)
Our PUA protection aims to safeguard user productivity and ensure enjoyable Windows experiences. This protection helps deliver more productive, performant, and delightful Windows experiences. For instruction on how to enable PUA protection in Chromium-based Microsoft Edge and Microsoft Defender Antivirus, see Detect and block potentially unwanted applications.
PUAs are not considered malware.
Microsoft uses specific categories and the category definitions to classify software as a PUA.
Advertising software: Software that displays advertisements or promotions, or prompts you to complete surveys for other products or services in software other than itself. This includes software that inserts advertisements to webpages.
Torrent software (Enterprise only): Software that is used to create or download torrents or other files specifically used with peer-to-peer file-sharing technologies.
Cryptomining software: Software that uses your device resources to mine cryptocurrencies.
Bundling software: Software that offers to install other software that is not developed by the same entity or not required for the software to run. Also, software that offers to install other software that qualifies as PUA based on the criteria outlined in this document.
Marketing software: Software that monitors and transmits the activities of users to applications or services other than itself for marketing research.
Evasion software: Software that actively tries to evade detection by security products, including software that behaves differently in the presence of security products.
Poor industry reputation: Software that trusted security providers detect with their security products. The security industry is dedicated to protecting customers and improving their experiences. Microsoft and other organizations in the security industry continuously exchange knowledge about files we have analyzed to provide users with the best possible protection.
Malwarebytes is an important security program to protect any user's computer. It is light-weight, fast, and best of all, excellent at removing the latest infections that may be in the wild. Malwarebytes is updated numerous times throughout the day, which allows you to stay protected from threats as they come out. One of the best parts of the program is that not only will it scan your computer free, but it will also remove any malware it finds at no cost to you either.
While scanning and cleaning a computer using Malwarebytes is always free, upgrading to the Premium version offers many benefits. This includes real-time protection, anti-ransomware, anti-exploit, and malicious website protection features.
Real-time protection monitors your computer in real-time and if you attempt open a malicious program or file, Malwarebytes will block it and automatically quarantine the file. This protects your from running infections that are disguised as free downloads or malicious attachments.
The anti-ransomware feature protects you from existing and new ransomware threats that may infect your computer. When Malwarebytes anti-ransomware detects ransomware behavior, such as file encryption, it will automatically halt the process exhibiting this behavior so that it cannot continue encrypting your computer.
The anti-exploit feature protects your compuer from exploit kits that try to attack vulnerabilities found in Windows and your installed programs. If Malwarebytes anti-exploit detects an exploit kit on a site that you are visiting or one that is attempting to exploit your computer's vulnerabilities, Malwarebytes will block it before it can infect your computer.
Finally, the malicious website protection feature will block your computer from accessing known malicious sites. These sites are labeled as malicious if they are known to offer malware, adware, pups, in-browser miners, or are hosting exploit kits. By using the malicious protect feature, your computer will be blocked from threats before they have a chance to attack you.
When a user installs Malwarebytes for the first time, they get all the features of the Premium version for free for 14 days. After that they can choose to upgrade to the Premium version or continue with the scan and clean features of the Free version. Regardless of whether or not you pay to activate Malwarebytes, we suggest that you install this program on your computer and perform a routine scan with it at least once a week. This will assure you that your computer is being secured from some the newest infections out there.
For those wishing to license Malwarebytes Premium for their entire household or business, Malwarebytes offers an interesting license option. They offer a base license for $39.99, which protects one computer for one year. You can then buy protection for additional devices for $10 more per devices. When buying a license, it is important to note that they are multi-platform. That means that the license can be used on Windows, Mac, or Android.
For a more detailed tutorial on how to clean your computer using Malwarebytes' Anti-Malware, please visit this guide:
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Here’s the list of changes / improvements in 4.2:
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- Prompting and managing for re-enabling protections.
- Memory usage.
- Detection and remediation.
- Cannot delete report files under certain circumstances.
- Wrong scan report opened or exported in UI.
- MBAM isn't exited from Play Mode if game application is terminated forcibly.
- Several UI issues.