Squeaker Virus

 Virus Name:  Squeaker 
 V Status:    Rare 
 Discovered:  November, 1991 
 Symptoms:    .COM & .EXE growth; decrease in total system and available 
              free memory; Scan.Exe will be deleted if executed; file 
              date/time change 
 Origin:      Unknown 
 Eff Length:  1,091 Bytes 
 Type Code:   PRhAK - Parasitic Resident .COM & .EXE Infector 
 Detection Method:  ViruScan, AVTK, Sweep, F-Prot, ChAV, 
                    NAV, IBMAV, NAVDX, VAlert, PCScan, 
                    NShld, LProt, Sweep/N, Innoc, NProt, AVTK/N, 
                    NAV/N, IBMAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Squeaker virus was received from Europe in November, 1991. 
       Squeaker is a memory resident infector of .COM and .EXE programs, 
       including COMMAND.COM. 
       The first time a program infected with Squeaker is executed, the 
       virus will install itself memory resident at the top of system 
       memory but below the 640K DOS boundary.  Total system and available 
       free memory, as indicated by the DOS CHKDSK program, will have 
       decreased by 1,136 bytes.  Interrupt 12's return will not have been 
       moved.  Interrupts 1C and 21 will be hooked by the virus. 
       Once Squeaker is memory resident, it will infect .COM and .EXE 
       programs when they are executed.  If COMMAND.COM is executed, it 
       will also become infected.  Programs infected with Squeaker will 
       have a file length increase of 1,091 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 system 
       date and time when infection occurred. 
       A symptom of a Squeaker infection is that once the virus is memory 
       resident, if the system user attempts to executed Scan.Exe, Scan.Exe 
       will be deleted.  The user will then be returned to the DOS prompt. 
       It is unknown if Squeaker contains any other damage potential. 

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