Viral Rewind: Trojan.DOS.Acid2

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. Acid2 (aka Acid Rain) is a DOS trojan with a mostly destructive payload that executes upon launch.

The payload: When Acid2 is first executed it scrolls by several lines that read things such as "can't open" and "please stand by" while accessing the hard disk drive. Eventually the lines no longer continue scrolling by and after more hard disk activity the screen is cleared and instead filled by many overlapping lines flashing in red saying "AcId rAIN". It displays "AcId Trogan by AcId rAIN" at the end and then proceeds to access the primary (and possibly secondary) floppy disk drive(s). Afterwards it finishes with "Programmed by AcId rAIN" and halts the computer requiring a restart (Ctrl-Alt-Del is still enabled).

Upon restart the computer will no longer boot as Acid2 has deleted many key directories including DOS, WINDOWS and many files related to PC operation. It doesn't delete all directories so some files and programs may still be recoverable. In turn it does generate many empty directories labeled with numbers, letters and words with three directories labeled "THATS ALL FOLKS" seen at the end of a directory listing.

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