| Alias: | Yale, Alameda (A) | | Strain: | Merritt/Alameda-Strain | | detected when: | November 24, 1988 | | where: | University of New Brunswick, Fredericton, CANADA | | Classification: | System Virus (= BootSector-Virus) | | Length: | 512 Bytes |
Preconditions | | Operating System(s): | MS-DOS | | Version/Release: | | | Computer model(s): | | | Caroname: | Yale.A |
Attributes | | Easy identification: | No characteristic text (in code, Vol-labels etc). | Type of Infection: | Boots when infected disk is inserted and system is booted. Installs itself in high memory, removes that memory from DOS. Installs itself as the Warm-start (CTRL+ALT+DEL) interrupt handler (actually the keyboard handler); spreads by CTRL+ALT+DEL interrupt handler. Moves "real" boot sector to track 39, sector 8. Does not infect .COM or .EXE files. | | Infection Technique: | | | Infection Trigger: | | | Storage Media affected: | | | Interrupts hooked: | | | Stealth: | | | Tunneling/Selfprot: | | | Oligo/Polymorphism: | | | Encoding Method: | | | Damage: | Permanent Damage: moves boot block to track 39, sector 8 (if there was a file, it is corrupted). This sector is not marked as bad, so a file may overwrite the real boot block so that the disk may become "NOT bootable". It will count to 39 and Blast the FAT (`0'). It counts a certain key stroke (there is also code for decrementing the count by another keystroke). | | Damage Trigger: | | | Particularities: | Hangs-up 80286-systems. | | Similarities: | With other members of Merritt/Alameda-strain. |
Agents | | Countermeasures: | Michael MacDonalds own vaccine, which identifies virus and overwrites the boot block. | | Standard means: | Compare boot sector of infected disk with a "real" system disk. If different: check track 39, sector 8; if this contains the real boot block, execute a SYS command to reinstall real boot block and system files. |
Acknowledgements | | Location: | School of Computer Science, University of New Brunswick | | Classification by: | Michael J. MacDonald | | Documentation by: | Michael J. MacDonald, Software Specialist University of New | | Date: | June 5, 1989 | | Information Source: | --- |
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