Chaser Virus

 Virus Name:  Chaser 
 V Status:    Rare 
 Discovery:   June, 1992 
 Symptoms:    .EXE file growth; system hangs 
 Origin:      Unknown 
 Eff Length:  980 - 994 Bytes 
 Type Code:   PNE - Parasitic Non-Resident .EXE Infector 
 Detection Method:  ViruScan, Sweep, IBMAV, F-Prot, AVTK, 
                    NAV, NAVDX, VAlert, PCScan, ChAV, 
                    NShld, Sweep/N, Innoc, AVTK/N, NProt, IBMAV/N, NAV/N, 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Chaser virus was isolated in June, 1992.  Its origin or point 
       of isolation are unknown.  Chaser is a non-resident direct action 
       infector of .EXE programs. 
       When a program infected with the Chaser virus is executed, the 
       Chaser virus will infect one .EXE program located in the current 
       drive's current directory.  Once it has infected a program, a system 
       hang will occur.  The program the user was attempting to execute will 
       not be run.  Programs infected with the Chaser virus will have a 
       file length increase of 980 to 994 bytes with the virus being located 
       at the end of the file.  The program's date and time in the DOS disk 
       directory listing will not be altered.  No text strings are visible 
       within the viral code in Chaser infected programs. 

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