Virus Database

YCTC family

Description YCTC family

These are very dangerous memory resident parasitic viruses. They hook INT 21h, 2Fh. INT 2Fh hook is used for stealth. INT 21h hook is used for infection - the viruses write themselves to the end of COM and EXE files that are executed or opened. They do not infect files with names that start with:
"YCTC.1729": COMMAND IBM ET PC TB CKVI KLVI DEVI BTOOL
RTOOL TDISK SCAN CLEAN HUNT F- TR G
"YCTC.1975": COMMAND LIU2 EMM386 JEAN RAR VTHUNT VTSCAN

"YCTC.1729" uses anti-debugging tricks. It deletes the files with names that start with 'Z' letter, or if directory name starts with 'Z', then it displays the message:
You have a Y.C.T.C.Virusall Ha! Ha! Ha! Ha!
== Written by Y.C.T.C.student 1995. ==
=== I am y.c.t.c. student written... ===

"YCTC.1975" corrupts the files while infecting them (i.e. it is "intended" virus). Depending on the system date it deletes the files, displays the messages in Chinese and English:
Hello !! I am a cute virus baby.
You can call me [ YCTC ] virus..
Come on,to go to study YCTC school !!
Written by Jean 1995.08.01.
Happy birthday to my dear !!
Written by Jean 1995.08.01.

Check other viruses! Be aware! Use Antiviral Software

MKWorm.715

Description MKWorm.715

It's a not dangerous not memory resident virus. It scans subdirectory tree and of there are not .COM-files in specified subdirectory, this virus creates "worm" file with random selected name and .COM extension. It writes itself into this file. Depending on the system timer this virus stays memory resident, hooks INT 1Ch and manifests itself by the video effect. This virus contains the internal text string: "MK Worm / Trident".

MLTI.830.a

Description MLTI.830.a

This is a very dangerous memory resident parasitic virus. It hooks INT 21h, and writes itself to the end of .COM files that are executed. On Fridays, some time after installation, the virus starts to delete files instead of executing them. The virus contains the text:
Hello! MLTI!
Eddie die somewhere in time! This programm was written in the
city of Prostokwashino (C) 1990 RED DIAVOLYATA

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