Error Virus

 Virus Name:  Error 
 V Status:    Rare 
 Discovered:  October, 1991 
 Symptoms:    .EXE file growth; file date/time change; messages when user 
              attempts to execute programs 
 Origin:      Argentina 
 Eff Length:  628 - 642 Bytes 
 Type Code:   PRhE - Parasitic Resident .EXE Infector 
 Detection Method:  ViruScan, AVTK, F-Prot, IBMAV, ChAV, 
                    NAV, Sweep, NAVDX, VAlert, PCScan, 
                    NShld, LProt, Innoc, AVTK/N, Sweep/N, NAV/N, IBMAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Error virus was discovered in Argentina in October, 1991.  Error 
       is a memory resident infector of .EXE programs. 
       The first time a program infected with Error is executed, the Error 
       virus will become memory resident, hooking interrupt 21.  Once 
       resident, any attempt by the system user to execute a program or 
       DOS command will result in an error message being displayed.  The 
       error message may be "Exec failure" or "Bad Command or file name". 
       Additionally, if the program the user was attempting to execute had 
       the Read-Only attribute set, it will reset the attribute. 
       Error will sometimes infect .EXE programs which are executed after 
       the virus has become memory resident.  When it does infect .EXE 
       programs, the program will increase in size by 628 to 642 bytes with 
       the virus being located at the end of the infected file.  The file's 
       date and time in the DOS disk directory will have been updated to 
       the current system date and time when infection occurred.  No text 
       messages appear within the Error virus' code in infected programs. 

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