Guillon Virus

 Virus Name:  Guillon 
 V Status:    Rare 
 Discovered:  October, 1991 
 Symptoms:    BSC; Master Boot Sector Altered; decrease in total system and 
              available free memory; possible FAT damage; internal stack 
              overflow errors; system hangs 
 Origin:      Buenos Aires, Argentina 
 Eff Length:  N/A 
 Type Code:   BRX - Resident Boot Sector & Master Boot Sector Infector 
 Detection Method:  ViruScan, F-Prot, AVTK, IBMAV, 
                    Sweep, NAV, NAVDX, VAlert, PCScan, ChAV 
 Removal Instructions:  M-Disk /P, or DOS SYS on infected system diskettes 
 General Comments: 
       The Guillon virus was discovered in Buenos Aires, Argentina in 
       October, 1991.  Guillon is a memory resident infector of the hard 
       disk master boot sector (partition table) and the boot sector of 
       diskettes.  It will only replicate to diskettes when it has become 
       memory resident from the system being booted from an infected 
       diskette, but not when it is booted from an infected hard disk. 
       When the system is booted from a diskette infected with the Guillon 
       virus, Guillon will become memory resident, as well as infect the 
       hard disk master boot sector.  Total system and available free 
       memory, as measured by the DOS CHKDSK program, will have decreased 
       by 4,096 bytes. 
       At this point, the Guillon virus will infect any non-write 
       protected diskette exposed to the system.  The Guillon virus 
       expects diskettes to be 360K double density diskettes, and any other 
       diskette size and format may result in damage to the file 
       allocation table, corrupting programs and data files. 
       When the system is later booted from the system hard disk, the 
       Guillon virus will become memory resident as well, however it will 
       not infect diskettes accessed on the system.  At this time, total 
       system and available free memory will have decreased by 6,144 plus 
       bytes, the number increasing by approximately 2K each time the 
       system is booted. 
       Besides the decrease in total system memory, and corruption of 
       diskettes, systems infected with Guillon will experience internal 
       stack overflow errors with a system hang. 

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