| Alias: | Zak2 |
| Strain: | Helloween strain |
| detected when: | |
| where: | |
| Classification: | COM and EXE infector, resident |
| Length: | 2608 |
Preconditions | |
| Operating System(s): | MS-DOS |
| Version/Release: | None |
| Computer model(s): | PC's |
| Caroname: | Helloween.1839 |
Attributes | |
| Easy identification: | |
Type of Infection: | The virus appends itself to the files Selfrec in memory: INT_21; AX=EC27h -> AX=4A52h Selfrec on disk: FILE[LASTBYTE-1..LASTBYTE] = 6Ch FDh |
| Infection Technique: | |
| Infection Trigger: | (Exec) and (not in List) and (LengthCOM>63184)and (LengthEXE<=Length_in_EXE_Header) |
| Storage Media affected: | |
| Interrupts hooked: | 21/25, 21/35, 21/4B00 |
| Stealth: | |
| Tunneling/Selfprot: | |
| Oligo/Polymorphism: | - |
| Encoding Method: | |
| Damage: | Transient: None Permanent: None |
| Damage Trigger: | Transient: (Day=20) and (Day=10) => None ! Permanent: None |
| Particularities: | The virus resides above the last MCB None Displayed text: None Not displayed text: "Virus napsany specialne pro inzenyra ZAKA ze SPS*******************Nepodlehejte panice, mate nakazeno jen par souboru...(c) 1993 II.A 1988Tak a ted si vyzkousime treba: RESET" ; Encrypted"SCANSHIETRAPVIRUVCOPASTAALIKAZORREX COMMUEXEUCOMVIRTCLEATSAFNAV INI BOOT3P F-PR" ; Encrypted Never activated due to error in evaluating triggercondition (see T_DAMAGE_TRIGGER) |
| Similarities: | |
Agents | |
| Countermeasures: | |
| Standard means: | |
Acknowledgements | |
| Location: | Virus Test Center, University Hamburg, FRG |
| Classification by: | Petr_FPL Odehnal |
| Documentation by: | Petr_FPL Odehnal |
| Date: | 1993-08-18 |
| Information Source: | Caroentry (autom.converter by S.Freitag) |
(c) 1996 Virus-Test-Center, University of Hamburg