"5th Generation" (5-June-1990)
Entry...............: "5th. Generation"  
Alias(es)...........: ---
Virus Strain........: ---
Virus detected when.: May 1989
              where.: Utrecht (Netherlands)
Classification......: Bootsector-Virus
Length of Virus.....: 326 Bytes
--------------------- Preconditions -----------------------------------
Operating System(s).: Atari-TOS
Version/Release.....: 1.0, 1.2 (1.4 not yet tested)
Computer model(s)...: All types of the Atari ST Series
--------------------- Attributes --------------------------------------
Identification......: First word in the boot sector = $601C. 
Type of infection...: Infects the boot sector of the disk A, if it is 
                      regarded to be non-infected.
Infection Trigger...: check if bootsector is executable
Media affected......: Infection of disc in drive A.
Interrupts hooked...: BIOS-Trap used and changed by this virus.
Damage..............: Infects the boot sector of the disk, if it is 
                      regarded to be un-infected. Clear Track 0 
                      with the FAT and the directory.
Damage Trigger......: If counter (at start of virus + 324) = 0. Initial
                      value depends on number of infections.
Particularities.....: ---
Similarities........: ---
--------------------- Agents ------------------------------------------
Countermeasures.....: Programs that calculate the bootsector's checksum 
                      and modify it, if it is $1234; then, the sector  
                      is regarded as not executable. The suspected  
                      more dangerous second part of the virus might 
                      not be recognized because it does not need
                      to have the correct checksum.
Countermeasures successful: ---
Standard means......: Write protect the disk / Write an easily 
                      identifiable bootsector / 'Manually' change the 
                      checksum to a value other than $1234 .
--------------------- Acknowledgement ---------------------------------
Location............: Virus Test Center, University Hamburg, FRG
Classification by...: Ralf Stegen
Documentation by....: Ralf Stegen
Information Source..: George R. Woodside
Date................: 5-June-1990

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