Added a new atomic test
Added a new atomic test

We have added a new atomic test with guid ffcbfaab-c9ff-470b-928c-f086b326089b that sets two registry keys HKLM\SOFTWARE\Micosoft\Windows\CurrentVersion\Policies\System\LegalNoticeCaption and HKLM\SOFTWARE\Micosoft\Windows\CurrentVersion\Policies\System\LegalNoticeText to display a ransom message. While executing this atomic test, the value for these registries can be configured using the switch -PromptForInputArgs. This technique has been used by many ransomwares in the past including SynAck, Grief, Maze, Pysa, Spook, DopplePaymer, Reedemer and Kangaroo.  After encrypting files, ransomwares modify the Windows LegalNoticeCaption and LegalNoticeText registry keys to display a ransom message to victim at logon.
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