| Alias: | |
| Strain: | Infiltrator |
| detected when: | |
| where: | |
| Classification: | Linkvirus, Extending, not reset-resident |
| Length: | 1.Length (1128) on storage medium 2.Length (2000) in RAM |
Preconditions | |
| Operating System(s): | AMIGA-DOS |
| Version/Release: | OS > 1.3 (will probably crash under 1.3/1.2) |
| Computer model(s): | All Amiga's without CPU-Cache |
| Caroname: | Infiltrator.DarkAvenger.A |
Attributes | |
| Easy identification: | - |
Type of Infection: | Self-Identification method on disk: Checking branch command at first codehunk of infected File Self-Identification method in memory: Checking for a matchword ($A0A1) at hooked- vector location -2 Executable File infection: extending file by 1128 bytes Memory-resident, hooking DOS-Open-Vector Not reset-resident Infection preconditions: Disk valid 8 spare blocks free Filesize <= 100000 Filesize >= 2000 Codehunk - Size <= 32752 Memory for infection available HUNK_HEADER found HUNK_CODE found HUNK_RELOC32 found 101500 Bytes of Memory allocatable JMP or JSR is not the first command in the Codehunk Original-Code is overwritten - but will be restored and executed (virus restores the original file, so that integrity-checks of the executeable itself probably will fail) |
| Infection Technique: | |
| Infection Trigger: | Opening executeable file |
| Storage Media affected: | All media |
| Interrupts hooked: | DOS-VEC OPEN |
| Stealth: | |
| Tunneling/Selfprot: | |
| Oligo/Polymorphism: | |
| Encoding Method: | |
| Damage: | Transient Damage: Sets the current Windowtitle to ' -=- The Dark Avenger -=-',0 Transient/Permanent damage: Can't handle all DOS-Requests correctly Crashes the System on some requests May "Infect" data-files matching to te infection preconditions Some files won't run after infection. |
| Damage Trigger: | Random (Rasterbeam on startup of infected file) |
| Particularities: | No Memory available on virus startup -> virus executes its code in not allocated area may cause a crash after quitting the infected program. Virus "trys" to work with lower operating-System versions - but the routine for that will probably almost always crash. Virus is encrypted with random Value from raster-beam. The programmer of this Virus has very poor programming abilities, his System very surely runs under OS2.04 |
| Similarities: | Most parts are similar to the Infiltrator-Virus |
Agents | |
| Countermeasures: | All |
| 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