| Alias: | |
| Strain: | - |
| detected when: | |
| where: | |
| Classification: | EXE-infector, resident |
| Length: | 2 kilobyte(s) |
Preconditions | |
| Operating System(s): | MS-DOS |
| Version/Release: | read-only files are not infected |
| Computer model(s): | PC's |
| Caroname: | 5lo |
Attributes | |
| Easy identification: | |
Type of Infection: | The virus appends itself to the files Selfrec in memory: Int21_handler[0] == 0F9F8h (CLC; STC) Selfrec on disk: File[0Ch] == 0FFAAh |
| Infection Technique: | |
| Infection Trigger: | (Load || Term) && (search .\*.exe) && (pag/mod Filesize== actual Filesize) |
| Storage Media affected: | |
| Interrupts hooked: | 21/4B 21/4C |
| Stealth: | |
| Tunneling/Selfprot: | |
| Oligo/Polymorphism: | - |
| Encoding Method: | |
| Damage: | Transient: - Permanent: - |
| Damage Trigger: | Transient: - Permanent: - |
| Particularities: | The virus resides above the last MCB Infected files are datestamped to the time of infection.The DTA is restored to a bogus value on exiting from the int21routine. It is possible that another file is erronuously closedif no *.exe files are found in the current directory. There areother non-specific bugs. Not displayed text: "92.05.24.5lo.2.23" There is an int3 breakpoint in the code just before the virusrelocates itself at the resident address. |
| Similarities: | |
Agents | |
| Countermeasures: | |
| Standard means: | |
Acknowledgements | |
| Location: | Virus Test Center, University Hamburg, FRG |
| Classification by: | Adam David, Frisk Software International |
| Documentation by: | Adam David, Frisk Software International |
| Date: | 26.7.93 |
| Information Source: | Caroentry (autom.converter by S.Freitag) |
(c) 1996 Virus-Test-Center, University of Hamburg