JOSHUA Virus (5-June-1990)
Entry...............: JOSHUA Virus
Alias(es)...........: ---
Virus Strain........: ---
Virus detected when.: October 1989
              where.: Elmshorn, FRG
Classification......: system virus (bootblock), resident
Length of Virus.....: 1. length on storage medium: 1024 byte
                      2. length in RAM           : 1024 byte
--------------------- Preconditions -----------------------------------
Operating System(s).: AMIGA-DOS
Version/Release.....: 1.2/33.166, 1.2/33.180 and 1.3/34.20
Computer model(s)...: AMIGA 500, AMIGA 1000, AMIGA 2000A, AMIGA 2000B
--------------------- Attributes --------------------------------------
Easy Identification.: ---
Type of infection...: self-identification method: testing value of
                         adress the vertical blank interrupt vector
                         is pointing to plus 480 byte, if matching 
                         hex. $2029002C (MOVE.L 44(A1),D0 ) -> start
                         of the infection part of the virus
                      system infection: RAM resident, reset resident,
                         bootblock
Infection Trigger...: reset (CONTROL + Left-AMIGA + Right-AMIGA)
                      operation: any disk access
Storage media affected: only floppy disks (3.5" and 5.25")
Interrupts hooked...: vertical blank interrupt (IV 5)
Damage..............: permanent damage: overwriting bootblock
                      transient damage: unknown yet
Damage Trigger......: permanent damage: reset
                         operation: any disk access
                      transient damage: 6th infection
Particularities.....: other resident programs using the system resident
                         list (KickTagPointer,KickMemPointer) are shut
                         down; uses BeginIO() routine.
Similarities........: ---
--------------------- Agents ------------------------------------------
Countermeasures.....: Names of tested products of Category 1-6:
                      Category 1: .2 Monitoring System Vectors:
                                     'CHECKVECTORS 2.2'
                                  .3 Monitoring System Areas:
                                     'CHECKVECTORS 2.2','GUARDIAN 1.2',
                                     'VIRUSX 4.0'
                      Category 2: Alteration Detection: ---
                      Category 3: Eradication: 'CHECKVECTORS 2.2',
                                     'VIRUSX 4.0'
                      Category 4: Vaccine: ---
                      Category 5: Hardware Methods: ---
                      Category 6: Cryptographic Methods: ---
Countermeasures successful: 'CHECKVECTORS 2.2', 'GUARDIAN 1.2',
                            'VIRUSX 4.0'
Standard means......: 'CHECKVECTORS 2.2'
--------------------- Acknowledgement ---------------------------------
Location............: Virus Test Center, University Hamburg, FRG
Classification by...: Wolfram Schmidt (still working on it)
Documentation by....: Alfred Manthey Rojas
Date................: 5-June-1990
Information Source..: ---

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