Salamanca.1205
Description Salamanca.1205
It is a dangerous memory resident parasitic virus. It hooks INT 21h and writes itself to the beginning of COM files that are executed. The virus has bugs and often halts the computer. Depending on the system time and its flags the virus creates the VIRUS file in root directory on the current drive and writes the text SALAMANCA to there. The virus then reads and modifies in some way the root directory of the C: drive.
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JumpBoot
Description JumpBoot
It is a very dangerous memory resident multipartite virus. While executing an infected file the virus infects the MBR of the hard drive, and returns the control to DOS. While loading from infected disk the virus copies itself into Interrupt Vectors Table, hooks INT 13h and stays memory resident. The virus is stealth one while accessing to infected MBR.
While writing sectors to the floppy disks the virus checks the first byte of the sector. It that byte is JMP command (E9h or EBh), the virus overwrites that sector with its code. As a result the COM files which begin with JMP instruction are overwritten with virus copy when these files are copied to the floppy disk. While overwriting a sector the virus does not check is that sector the file beginning. So the virus can write its copy to the file middle. After infecting any file the virus disables its infection routine and does not infect the files up to next reboot.
June16
Description June16
If is a very dangerous nonmemory resident encrypted parasitic virus. It searches for .COM files and writes itself to the beginning of the file. On June, 16th the virus renames all files to 'ZAPPED'.
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