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Aliases: Trojan-Ransom.Win32.PornoBlocker.bho (Kaspersky) W32/Ransom.KB (Norman) Trojan.PornoBlocker!CvjyYihPT7M (VirusBuster) TR/Ransom.PornoBlocker.bho (Avira) Win32/LockScreen.XU (ESET) Trojan-Ransom.Win32.PornoBlocker (Ikarus) TROJ_RANSOM.FP (Trend Micro)
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.