Virus Database

TMC

Description TMC

It is a harmless memory resident partly encrypted parasitic virus. It hooks INT 21h and writes itself to the end of COM and EXE files that are accessed. The virus infects the files on floppy disks only. The virus checks the file names and does not infect the files: NO*.*, WE*.*, TB*.*, AV*.*, F-*.*, SC*.*, CL*.*, CO*.*, WI*.*, KR*.*.
The virus uses uncommon polymorphic engine - each time the virus installs itself into the memory it mixes blocks of its code and data and inserts random data. The virus also changes data offsets in its assembler instructions, constants and so on. As a result, the virus is not 100% encrypted, but it has no constant parts of code and ever the length of virus is changed.
Being installed into the memory the virus does not changes its code anymore, and all its replications have constant set of instructions. After reboot the virus installs itself into the memory and generates new set of instruction and infects files with this new set.
The virus contains the text:
* TMC 1.0 by Ender *
Welcome to the Tiny Mutation Compiler!
Dis is level 6*9.
Greetings to virus makers: Dark Avenger, Vyvojar, SVL, Hell Angel
Personal greetings: K. K., Dark Punisher

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Nygus Family

Description Nygus Family

These are harmless memory resident parasitic viruses. They write themselves to the end of the files. These viruses contain the strings:
"Nygus.227": Nygus v1.1
"Nygus.278": (c)Nygus v1.1
"Nygus.295": (c)Nygus v1.2
"Nygus.752,757": (c)Nygus v2.0

"Nygus.227,278,295" are nonmemory resident viruses. They search for .COM files and infect them.
"Nygus.752,757" are memory resident viruses. They hook INT 21h and infect .COM and .EXE files that are executed.

Nymphet.1024

Description Nymphet.1024

It is a dangerous memory resident parasitic virus. It hooks INT 21h and on changing current directory searches for .COM and .EXE files and writes itself to the end of files. The virus has a bug and infected files may halt the system. The virus contains the text strings:
*.com *.exe
NYMPHET ver. 1.0

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