| Alias: | NYB |
| Strain: | - |
| detected when: | |
| where: | |
| Classification: | Master-boot record (HD) infector, DBR - infector , resident |
| Length: | 1C0B |
Preconditions | |
| Operating System(s): | MS-DOS |
| Version/Release: | All models |
| Computer model(s): | PC's |
| Caroname: | B1 |
Attributes | |
| Easy identification: | |
Type of Infection: | Bootsector infection. Selfrec on disk: MBR[40h...80h] = 0Eh E8h ABh 00h 50h D1h E8h FEh ... |
| Infection Technique: | |
| Infection Trigger: | boot from an infected floppy disk, if residentread or write to track 0 on any floppy disk drive |
| Storage Media affected: | Harddisks, Disketts |
| Interrupts hooked: | 13h |
| Stealth: | |
| Tunneling/Selfprot: | |
| Oligo/Polymorphism: | - |
| Encoding Method: | |
| Damage: | Transient: moves head of actual drive permanently from 1st tolast track / cylinder Permanent: - |
| Damage Trigger: | Transient: (w/0:046Dh && 178Fh) == 0 (BIOS Timer) Permanent: - |
| Particularities: | The virus resides at the top of memory, reducing the BIOS memory size at 0000:0413. |
| Similarities: | |
Agents | |
| Countermeasures: | |
| Standard means: | |
Acknowledgements | |
| Location: | Virus Test Center, University Hamburg, FRG |
| Classification by: | BSI (GISA) / V2, Hubert Schmitz |
| Documentation by: | BSI (GISA) / V2, Hubert Schmitz |
| Date: | 1994-12-20 |
| Information Source: | Caroentry (autom.converter by S.Freitag) |
(c) 1996 Virus-Test-Center, University of Hamburg