AntiCMOS Virus

 Virus Name:  AntiCMOS 
 Aliases:     AntiCMOS.A 
 V Status:    Common 
 Discovery:   1994 
 Isolated:    April, 1995 
 Symptoms:    BSC; Master boot sector (partition table sector) altered; 
              decrease in total system & available free memory; 
              System CMOS / Setup information erased 
 Origin:      Unknown 
 Eff Length:  N/A 
 Type Code:   BRhX - Resident Boot Sector & Master Boot Sector Infector 
 Detection Method:  F-Prot, ViruScan, AVTK, IBMAV, NAV, 
                    Sweep, NAVDX, VAlert, PCScan, ChAV 
 Removal Instructions: 
 General Comments: 
       The AntiCMOS virus was received in April, 1995, though it has been 
       reported from sites in North America for several months.  AntiCMOS 
       is a memory resident infector of diskette boot sectors as well as 
       the system hard disk master boot sector. 
       When the system is first booted from an AntiCMOS infected diskette, 
       this virus will infect the system hard disk master boot sector.  It 
       does not become memory resident at this time.  AntiCMOS becomes 
       memory resident when the system is booted from the system hard disk. 
       When the AntiCMOS virus is memory resident, total system and 
       available free memory, as indicated by the DOS CHKDSK program, will 
       have decreased by 2,048 bytes. 
       Once the AntiCMOS virus is memory resident, it will infect un-write 
       protected diskettes by infecting the diskette boot sector when they 
       are accessed, though it does not always infect the diskette. 
       The AntiCMOS virus contains code to erase the CMOS or system setup 

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