Microsoft Defender Antivirus detects and removes this threat.

This JavaScript malware is hosted on malicious sites. When you access these sites, this threat displays succeeding fake alerts that falsely imply you that your computer is infected by malware or has system errors. The fake alerts tell you that in order to fix the "problem", you need to call a technical support number. You may be charged by the technical support. 

Our tech support scams FAQ page has more information on this type of threat.

You can also read the following blog entries to know more about the latest tech support scam attacks, techniques, and trends:

• New tech support scam launches communication or phone call app
• Tech support scams persist with increasingly crafty techniques

Microsoft Defender Antivirus detects and removes this threat.

This JavaScript malware is hosted on malicious sites. When you access these sites, this threat displays succeeding fake alerts that falsely imply you that your computer is infected by malware or has system errors. The fake alerts tell you that in order to fix the "problem", you need to call a technical support number. You may be charged by the technical support.

Our tech support scams FAQ page has more information on this type of threat. 

You can also read the following blog entries to know more about the latest tech support scam attacks, techniques, and trends: 

• New tech support scam launches communication or phone call app
• Tech support scams persist with increasingly crafty techniques

Microsoft Defender Antivirus detects and removes this threat.

This ransomware encrypts files and asks for ransom in exchange for decrypting files.

It is downloaded by TrojanDownloader:Win32/Cryxos.B.

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.