Ada (computer virus)
Encyclopedia
Ada is a computer virus
that can affect any of the DOS
operating systems. Ada was first discovered in 1991.
Infected programs will have 2,600 bytes additional data inserted at the beginning of the file, and the file itself will contain the text strings:
Computers infected with the Ada virus will often have a slow clicking sound emitting from their speakers; this clicking may sometimes change in pitch. Computers infected also may show a "Disk Full" error even if the disk still has space on it.
While infected with the Ada virus, system memory measured by the DOS CHKDSK
decreases by 21,296 bytes to 21,312 bytes. The virus will reside in the memory after an infected file is run and will infect any other .COM files executed on the computer. It will also hijack interrupts 08, 13 and 21.
Computer virus
A computer virus is a computer program that can replicate itself and spread from one computer to another. The term "virus" is also commonly but erroneously used to refer to other types of malware, including but not limited to adware and spyware programs that do not have the reproductive ability...
that can affect any of the DOS
DOS
DOS, short for "Disk Operating System", is an acronym for several closely related operating systems that dominated the IBM PC compatible market between 1981 and 1995, or until about 2000 if one includes the partially DOS-based Microsoft Windows versions 95, 98, and Millennium Edition.Related...
operating systems. Ada was first discovered in 1991.
Virus Characteristics
Ada is a memory resident (stays in the memory of the computer it infects after the program it infect executes) virus that infects files. The Ada virus mainly targets .COM files, specifically COMMAND.COM.Infected programs will have 2,600 bytes additional data inserted at the beginning of the file, and the file itself will contain the text strings:
- COMMAND.COM
- PCCILLIN.COM
- PCCILLIN.IMG
- HATI-HATI !! ADA VIRUS DISINI !!Delete
Computers infected with the Ada virus will often have a slow clicking sound emitting from their speakers; this clicking may sometimes change in pitch. Computers infected also may show a "Disk Full" error even if the disk still has space on it.
While infected with the Ada virus, system memory measured by the DOS CHKDSK
CHKDSK
CHKDSK is a command on computers running DOS, OS/2 and Microsoft Windows operating systems that displays the file system integrity status of hard disks and floppy disk and can fix logical file system errors. It is similar to the fsck command in Unix.The command is implemented as an executable...
decreases by 21,296 bytes to 21,312 bytes. The virus will reside in the memory after an infected file is run and will infect any other .COM files executed on the computer. It will also hijack interrupts 08, 13 and 21.