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Alert level: Severe Detected with Windows Defender Antivirus
Also detected as: 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.
Read our latest report: Ransomware 1H 2017 review: Global outbreaks reinforce the value of security hygiene.