| Alias: | Ghost |
| Strain: | --- |
| detected when: | --- |
| where: | --- |
| Classification: | System (BootSector) Virus, Reset-resident, Overwriting |
| Length: | 512 Byte |
Preconditions | |
| Operating System(s): | ATARI-TOS |
| Version/Release: | All Version of TOS |
| Computer model(s): | All types of the Atari ST Series |
| Caroname: | Mouse |
Attributes | |
| Easy identification: | --- |
Type of Infection: | Self-Identification: The Virus tests adresse $140 for the first Virus instruction; virus installs itself reset- and RAMresident if virus code does not match. |
| Infection Technique: | |
| Infection Trigger: | Each time a new diskette is inserted, the virus will infect the new diskette. |
| Storage Media affected: | The virus infect drive A,B! |
| Interrupts hooked: | No Interrupts used. Resetvector for installation changed. hdv_bpb changed to infect Bootsector of new Disk. |
| Stealth: | |
| Tunneling/Selfprot: | |
| Oligo/Polymorphism: | |
| Encoding Method: | |
| Damage: | Permanent Damage: Overwriting Bootsectors. Transient Damage: Inverting Mouse Up-Down Moving- direction. |
| Damage Trigger: | Damage Action after 10 infections. Always after 5 new infections,the Mouse Movingdirection is again inverted. |
| Particularities: | --- |
| Similarities: | --- |
Agents | |
| Countermeasures: | Poke instruction 'move.l #$D6,d3' to adresse $140 (this excludes Virus' installation). |
| Standard means: | Write-protect the disk. Write a well-known program to the boot sector; 'manually' change the checksum to a value other than $1234. |
Acknowledgements | |
| Location: | Virus Test Center, University Hamburg, FRG |
| Classification by: | Thomas Piehl |
| Documentation by: | Thomas Piehl |
| Date: | Nov. 11,1989 |
| Information Source: | --- |
(c) 1996 Virus-Test-Center, University of Hamburg