Turn.557 Virus

 Virus Name:  Turn.557 
 V Status:    New 
 Discovered:  July, 1994 
 Symptoms:    .COM file growth; file date/time changes 
 Origin:      Unknown 
 Eff Length:  557 Bytes 
 Type Code:   PRhCK - Parasitic Resident .COM Infector 
 Detection Method:  F-Prot, AVTK, IBMAV, ViruScan, Sweep, NAV, 
                    NAVDX, VAlert, ChAV, 
                    NProt, AVTK/N, Sweep/N, Innoc, IBMAV/N, NShld, NAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Turn.557 virus was submitted in July, 1994.  Its origin or point 
       of isolation is unknown.  Turn.557 is a memory resident infector of 
       .COM files, including COMMAND.COM. 
       The first time a program infected with the Turn.557 virus is 
       executed, the virus will install itself memory resident at the top of 
       system memory but below the 640K DOS boundary, hooking interrupt 21. 
       Total system memory and available free memory, as indicated by the 
       DOS CHKDSK program, will have decreased by 1,632 bytes. 
       Once memory resident, the Turn.557 virus will infect .COM programs, 
       including COMMAND.COM, when they are executed.  Infected programs will 
       have a file length increase of 557 bytes with the virus being located 
       at the beginning of the file.  The program's date and time in the 
       DOS disk directory listing will have been updated to the current 
       system date and time when infection occurred.  No text strings are 
       visible within the viral code. 

Show viruses from discovered during that infect .

Main Page