This program is not a real trojan, but an utility that works like a trojan
because of a bug. It was possibly written to read the hard drive MBR, get
the address of DOS boot record and patch it so, that the system then will
not be able to access the hard drive (possibly there is the countra-utility
that recover these data and enables the hard drive). But due to a bug this
program (depending on the hard drive controller type) can corrupt random
sector (including system one) on the hard drive.