Windows Defender detects and removes this threat.

The threat is an HTML message that asks you to pay a ransom to regain access to the files encrypted by Ransom:Win32/Tescrypt.

Our ransomware page has more information on this type of threat.

Microsoft security software detects and removes this threat.

This trojan stops you from using your PC by showing an alert message screen. This screen can include adult content and might ask you to pay a "fine" or fee to unlock your PC.

This threat also replaces important Windows system files with copies of itself.

Due to the damage this threat can do to your PC, you might need to reinstall some files from a Windows installation disc, or a backup source.

Windows 10 protects you from ransomware. Read more:

Windows 10 Creators Update provides next-gen ransomware protection

Windows Defender detects and removes this threat.

This ransomware can stop you from using your PC or accessing your data. It might ask you to pay money to a malicious hacker. It can also be downloaded by other malware like JS/Nemucod as its payload.

Windows 10 protects you from ransomware. Read more:

Windows 10 Creators Update provides next-gen ransomware protection

Our ransomware page has more information on this type of threat.

This threat has been renamed to Ransom:Win32/Ergop.A.

Windows Defender detects and removes this threat.

This threat encrypts your files and displays a webpage that asks you to pay a fee to unlock them.

More information on this type of threat in the Ransom:Win32/Crilock.A description and in our Ransomware page.

Find out ways that malware can get on your PC.  

Windows Defender detects and removes this threat.

This ransomware can encrypt the files on your PC so that you can't access them. Threats in this ransomware family can be installed from Trojan:BAT/Zuquitache. 

Our ransomware page has more information on this type of threat.

This threat is a malicious program that is unable to spread of its own accord. It may perform a number of actions of an attacker's choice on an affected computer.

This ransomware prevents you from accessing your computer. It covers your entire desktop with an image pretending to be from your local authorities, asking you to pay a fine to regain access. The image covering the desktop is downloaded from a certain website.

Microsoft Defender Antivirus detects and removes this threat.

This ransomware  renders files inaccessible by encrypting them. It is also usually spread by Trojan:Win32/Trickbot and Win32/Emotet malware families via phishing emails.

After encrypting files, this ransomware sets the desktop wallpaper and stops processes from running on your machine without your consent.

Find out ways that malware can get on your PC.  

Read our report about ransomware protection: A worthy upgrade: Next-gen security on Windows 10 proves resilient against ransomware outbreaks in 2017.

Microsoft security software detects and removes this family of threats.

This ransomware family can lock your web browser by showing you a message that asks you to pay a fine. The message can pretend to be from a law enforcement agency and tells you to pay money to unlock your browser.

They can also stop you from closing your web browser, using the address bar, or pressing any shortcut keys.

You can be infected with this threat when you visit or are redirected to a malicious website.

See the Ransom:JS/Brolo family description for more information.

Microsoft Defender Antivirus detects and removes this threat.

The threat is a HTML page used by the Ransom:Win32/Urausy.A ransomware trojan.

This threat stops you from loading Windows and displays a full-screen message, commonly called a "lock screen". If this threat asks you to pay a fee or fine, do not pay it. The message is a fraud.

It tries to scare you into paying a fine to unlock your PC.

Windows Defender AV detects and removes this threat.

This ransomware can stop you from using your PC or accessing your data. It might ask you to pay money to a malicious hacker.

Our ransomware FAQ page has more information on this type of threat.

The trend towards increasingly sophisticated malware behavior, highlighted by the use of exploits and other attack vectors, makes older platforms so much more susceptible to ransomware attacks. From June to November 2017, Windows 7 devices were 3.4 times more likely to encounter ransomware compared to Windows 10 devices.

Read our latest report: A worthy upgrade: Next-gen security on Windows 10 proves resilient against ransomware outbreaks in 2017.

Microsoft Defender Antivirus detects and removes this threat. 

The threat locks your screen and prevents you from using your desktop. It shows you a message saying that if you want to regain access to your desktop, you have to pay a fine in the form of an SMS sent to a premium number.

This type of threat is known as ransomware.

Our ransomware FAQ page has more information on this type of threat.

The trend towards increasingly sophisticated malware behavior, highlighted by the use of exploits and other attack vectors, makes older platforms so much more susceptible to ransomware attacks. From June to November 2017, Windows 7 devices were 3.4 times more likely to encounter ransomware compared to Windows 10 devices.

Read our latest report: A worthy upgrade: Next-gen security on Windows 10 proves resilient against ransomware outbreaks in 2017.

Microsoft Defender Antivirus detects and removes this threat. 

This threat locks your PC and displays a full-screen message, commonly called a "lock screen". If this threat asks you to pay a fee or fine, don't pay it. The message is a fraud.

It pretends to be from your local police force and tries to scare you into paying a fine to unlock your PC.

It's likely your PC has also been infected with other malware from the Win32/Reveton family.

Our ransomware FAQ page has more information on this type of threat.

The trend towards increasingly sophisticated malware behavior, highlighted by the use of exploits and other attack vectors, makes older platforms so much more susceptible to ransomware attacks. From June to November 2017, Windows 7 devices were 3.4 times more likely to encounter ransomware compared to Windows 10 devices.

Read our latest report: A worthy upgrade: Next-gen security on Windows 10 proves resilient against ransomware outbreaks in 2017.