| Alias: | --- |
| Strain: | --- |
| detected when: | October 1989 |
| where: | Elmshorn, FRG |
| Classification: | system virus (bootblock), resident |
| Length: | 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 |
| Caroname: | Joshua.1 |
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 Technique: | |
| 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) |
| Stealth: | |
| Tunneling/Selfprot: | |
| Oligo/Polymorphism: | |
| Encoding Method: | |
| 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: | 'CHECKVECTORS 2.2', 'GUARDIAN 1.2', 'VIRUSX 4.0' |
| Standard means: | 'CHECKVECTORS 2.2' |
Acknowledgements | |
| Location: | Virus Test Center, University Hamburg, FRG |
| Classification by: | Wolfram Schmidt |
| Documentation by: | Alfred Manthey Rojas |
| Date: | 5-June-1990 |
| Information Source: | --- |
(c) 1996 Virus-Test-Center, University of Hamburg