From The Register: 

A new strain of "Ransomware" that attempts to coerce victims into paying $35 to unlock their Windows PC, is doing the rounds.

The scam uses a variety of premium rate numbers in different countries, and UK regulator PhonePayPlus is investigating the suspected misuse of a type of premium rate line normally used for sex lines in the UK.

The Delf-CTK Trojan poses as a "Browser Security and Anti-adware" security application whose license has expired. Windows machines infected by the malware are confronted by a full-screen message that poses as a Windows error. Ironically, but unsurprisingly, the malware typically uses Windows exploits to infect vulnerable machines.

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