Virus Database

Hack.130

Description Hack.130

It is a dangerous memory resident parasitic virus. When an infected file is executed the virus copies itself into the memory at address 9000:0000, and does not fix MCB list, and that might halt the computer. Then the virus hooks INT 21h and intercepts Write DOS function. When the destination is a COM file, the virus first writes its code, and then the original data that is writing. As a result when the COM files are copied, the virus writes its code to the beginning of the file. When the destination is standard output device (stdout), the virus displays:
(H*ck-tic)

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Andry.565

Description Andry.565

Harmless memory resident virus. It hooks INT 21h and writes itself to the end of executed COM files. Makes no indications of itself on an infected system. Contains a string:
ViRuZ by Andry Christian

Andryushka.3536

Description Andryushka.3536

These are very dangerous memory-resident polymorphic viruses. They affect COM- and EXE-files (excluding COMMAND.COM) whenever an infected file is started (search in directories). "Andryushka" also infect files from its TSR-copy (when the files are opened, run, renamed and so on). After getting infection from virus "Andryushka.3536" EXE-files are changed to COM-format (see the "VACSINA" viruses). The virus penetrates into the middle of a file. The part of the infected file where the virus has been written to is encrypted and placed at the end of the infected file.
The virus creates counters in the Boot-sectors of disks and depending on the counters values may corrupt some sectors on the disk C:. On doing this the virus plays a tune and displays the following text:
+-----------------------+
ƒ Hello!!! ƒ
ƒ My name is Andryushka ƒ
ƒ I come from Perm,USSR ƒ
+-----------------------+

The virus also contains the text: "insufficient memory". "Andryushka" works with interrupt handlers fairly well: it saves a part of the INT 25h handler in its own body and writes its code (call to INT 21h) into the emptied place. When INT 25h is called its handler is restored.

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