Hallo-496 Virus


 Virus Name:  Hallo-496 
 Aliases:     Hallo 
 V Status:    Rare 
 Discovered:  March, 1993 
 Symptoms:    .COM file growth; message displayed with system hang 
 Origin:      Unknown 
 Eff Length:  496 Bytes 
 Type Code:   PNCK - Parasitic Non-Resident .COM Infector 
 Detection Method:  Sweep, AVTK, F-Prot, ViruScan, IBMAV, 
                    NAV, NAVDX, VAlert, PCScan, ChAV, 
                    Sweep/N, AVTK/N, NProt, NShld, IBMAV/N, Innoc, NAV/N, 
                    LProt 
 Removal Instructions:  Delete infected files 
 
 General Comments: 
       The Hallo-496 virus was submitted in March, 1993.  Its origin or 
       point of isolation is unknown.  Hallo-496 is a non-resident, 
       direct action infector of .COM programs, including COMMAND.COM. 
 
       When a program infected with the Hallo-496 virus is executed, this 
       virus will infect one .COM program located in the current directory. 
       After it has infected a file, it will then display the following 
       message on the system display and a system hang will occur: 
 
               "Hallo! I have got a virus for you!" 
 
       Programs infected with the Hallo-496 virus will have a file length 
       increase of 496 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 have been updated to the current system date and time 
       when infection occurred.  The above text string is visible within 
       the viral code in all Hallo-496 infected files, as is the following 
       additional text string: 
 
               "$DSB" 
 
       Known variant(s) of Hallo-496 are: 
       Hallo-751: Hallo-751 was submitted in September, 1993.  Like the 
                  original virus, its origin or point of isolation is 
                  unknown.  Hallo-751 infects one .COM program located in 
                  the current directory, and displays the following message, 
                  whenever an infected program is executed: 
                  "Hallo! I have got a virus for you!" 
                  Miscellaneous characters from memory may be displayed 
                  following the message.  Infected programs will have a 
                  file length increase of 751 to 766 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 have been 
                  updated to the current system date and time when infection 
                  occurred.  Besides the message indicated above, the 
                  following text string can be found within the viral code 
                  in all infected files: 
                  "*.com" 
                  Origin:  Unknown  September, 1993. 
       Hallo-759: Hallo-759 was submitted in September, 1993.  Like the 
                  original virus, its origin or point of isolation is 
                  unknown.  Hallo-759 infects one .COM program located in 
                  the current directory, and displays the following message, 
                  whenever an infected program is executed: 
                  "Hallo! I have got a virus for you!" 
                  Infected programs will have a file length increase of 759 
                  to 774 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 have been updated to the current 
                  system date and time when infection occurred.  Besides the 
                  message indicated above, the following text strings can be 
                  found within the viral code in all infected files: 
                  "*.COM" 
                  ".com" 
                  Origin:  Unknown  September, 1993. 
 
       See:  Infector

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