| Alias: | - |
| Strain: | |
| detected when: | |
| where: | |
| Classification: | Not reset-resident Link-Virus (ext. Hunk-length) |
| Length: | 1.Length (400) on storage medium 2.Length (400) in RAM |
Preconditions | |
| Operating System(s): | AMIGA-DOS |
| Version/Release: | DOS-V33/34, KICK 1.2 / 1.3 |
| Computer model(s): | A500,A1000,A2000,A2500 |
| Caroname: | LZ_Link |
Attributes | |
| Easy identification: | none- |
Type of Infection: | Self-Identification methods on Disk: None (multiple links possible) Self-Identification methods in Memory: Checks Globalvec Write for ROM-call Executable File infection: Extending Hunk-Length, only able to infect files with two Hunks correctly. Searches for RTS (Return from Sobroutine) command and substitutes this with a branch to the Virus-entry point. (hiding Virus-entry point.) not Reset-resident, RAM-Resident, hooks Globalvec 06=Write of DOS-Base Infects on File-Modification like copy (slow-Infector) Infection-Preconditions: - No residents/overlays to load - File executeable ($3e9 found) - CODE-HUNK length > 1000 Bytes - First Codehunk does not contain JMP-cmds in the last 51 Words (beeing a Library for Ex.) |
| Infection Technique: | |
| Infection Trigger: | - Writing Executeable file (Copy, Compile) |
| Storage Media affected: | All media |
| Interrupts hooked: | DOS-GLOBALVEC 06 WRITE (Internal vec.) |
| Stealth: | |
| Tunneling/Selfprot: | |
| Oligo/Polymorphism: | |
| Encoding Method: | |
| Damage: | Permanent Damage: none Transient Damage: none Transient/Permanent damage: Some infected files will not run due to a bug in the infection routine. Multiple-Links are possible |
| Damage Trigger: | - |
| Particularities: | Very compact code including a complete Link-Virus within only 400 Bytes. Name of this virus is generated due to rumors that it is dropped by a lz-archiver. |
| Similarities: | - |
Agents | |
| Countermeasures: | all of the above |
| Standard means: | VT2.58 |
Acknowledgements | |
| Location: | Virus Test Center, University Hamburg, FRG |
| Classification by: | S. Freitag |
| Documentation by: | S. Freitag |
| Date: | 14.12.1993 |
| Information Source: | Reverse-Analysis of Virus-Code, Heiner Schneegold |
(c) 1996 Virus-Test-Center, University of Hamburg