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As for the previous rogues of this family, the software is hosted on google code.
Virus Sweeper comes from fake online scanners. Nonexistent files are detected on a clean system, installation of the software is proposed to users for a free scan.
Virus Sweeper drops many files on the system with different filenames taken from a dictionary. These files are not Win32 executables and are detected as infections.
BleepingComputer Removal Guide.
Malwarebytes VirusSweeper Blog Post.