Virus Database

Hadi.6153

Description Hadi.6153

It is not a dangerous memory resident partly encrypted parasitic virus. It hooks INT 8, 9, 20h, 21h and writes itself to the end of COM and EXE files that are executed or closed. The virus is semi-stealth: on opening an infected file the virus disinfects it, on DOS calls FindFirst/Next the virus returns the original length of infected files. When the disk checking utilities are run, the virus disables its stealth routines. The list of these utilities looks as follows: CHKDSK.EXE, SCANDISK.EXE, NDD.EXE, SPEEDISK.EXE, SD.EXE, DEFRAG.EXE. The virus does not infect the files: DEBUG.EXE, TD.EXE, CV.EXE, SI.EXE, NCSI.EXE, SYSINFO.EXE, MSD.EXE, HJ2321.EXE.
Depending on the system date and its internal flags the virus displays the messages:
Hercul Hadi
by Hadi Javan Amirkhizi
03/07/1996
TABRIZ--IRAN
Call me to repair your system (if you find me)
Press CTRL key for 5 seconds to return

Check other viruses! Be aware! Use Antiviral Software

Cha.2391

Description Cha.2391

It's a harmless memory resident parasitic virus. It hooks INT 1Ch, 21h and writes itself to the COM- and EXE-files ands at their execution. It contains the internal text string "cha-cha-chacha-cha-cha".

Chad Family

Description Chad Family

These are dangerous nonmemory resident parasitic viruses. They search for .COM files, then write themselves to the end of the file. Sometimes they display the picture:
______
/ ¦ O O ¦
-------------WW---- --+-WW------------
------------------- ------------------
-----------------------------------------
-------- WOT!! No Anti - Virus ---------
-------- Software all.. ---------
-----------------------------------------
-----------------------------------------

and halt the computer. The viruses also contain the text string:
CHAD Against Damaging Viruses ... Save Our Software. 1992.

"Chad.301,307" display the text:
You have the Phague

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