| Alias: | 648, Austrian Virus |
| Strain: | |
| detected when: | |
| where: | |
| Classification: | Programm Virus (Extending), Direct Action |
| Length: | 648 Bytes |
Preconditions | |
| Operating System(s): | PC-DOS, MS-DOS |
| Version/Release: | 2.xx and upward |
| Computer model(s): | IBM-PC XT AT |
| Caroname: | Vienna.648.Reboot |
Attributes | |
| Easy identification: | |
Type of Infection: | Self-Identification: The second-entry of the time stamp of an infected file is set to 62 dec. Infects .COM-files (with length between 10 and 64.000 bytes) in the current directory of the current drive and in all directories that are accessible via the PATH-definition. Virus code is appended at the end of the file. |
| Infection Technique: | |
| Infection Trigger: | Execution of an infected file. |
| Storage Media affected: | |
| Interrupts hooked: | |
| Stealth: | |
| Tunneling/Selfprot: | |
| Oligo/Polymorphism: | |
| Encoding Method: | |
| Damage: | The first five bytes of the selected file will be overwritten a long jump to the BIOS initialisation routine. |
| Damage Trigger: | IF (7 AND second-bits of system-time) equals 0. |
| Particularities: | For infection, the virus selects an appropriate file and, depending on the value of the damage trigger, either infects that file or overwrites the first five bytes. The attribute, time- and date-stamp of an infected file remains unchanged with exception of the seconds-bits. The READ-ONLY and HIDDEN attributes do not protect against infection. |
| Similarities: | |
Agents | |
| Countermeasures: | --- |
| Standard means: | ---- |
Acknowledgements | |
| Location: | Virus Test Center. University Hamburg, FRG |
| Classification by: | Rainer Anscheit (July 4, 1989) |
| Documentation by: | Rainer Anscheit (July 4,1989) |
| Date: | October 31, 1989 |
| Information Source: | |
(c) 1996 Virus-Test-Center, University of Hamburg