Prosti manual removal:
Kill processes:
lass..exe
Delete registry values:HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell="explorer.exe %System%\lass..exe"
Delete files:lass..exe, service.dll
Misc:Prosti files can be found in the default system directory, which is one of the following: C:\Windows\System, C:\Windows\System32, C:\Winnt\System32.
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