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Details
Bleah.a
This is a harmless memory resident boot virus. It infects the MBR of the hard drive and boot sector of floppy disks. While loading from infected disk it decreases the size of system memory (the word at address 0000:0413), copies itself to there, hooks INT 8 (timer), waits for DOS loading process, then restores the size of system memory and hooks INT 13h to infect the disks. As a result, the virus places itself to the block of system memory that is cut, but it does not change the total size of conventional memory. |
