This is a simple BAT trojan that deletes all files on C:, A:, B: and D: drives. The trojan uses 'DELTREE /Y' DOS command to delete the files. The trojan then tries to delete SIMPSONS.* files, but there are no more files on affected drives after the DELTREE command.
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The trojan is distributed as a self-extracting WinZip package that displays standard WinZip message after being run and then extracts the trojan and spawns it.
This trojan was reported to be in the wild in late June, 2000. However, it does not seem to be significantly widespread (as it does not replicate further by itself).
[Eugene Kaspersky, KL]