Virus Database

Edolan.832

Description Edolan.832

It is a very dangerous memory resident parasitic virus. It writes itself to the end of .COM files except COMMAND.COM. Being executed the virus hooks INT 21h and intercepts the execution of the files (AH=4Bh). While executing a .COM file the virus infects that file, then searches for *.COM files in the current directory and infects them, next the virus searches for *.DBF files and scans them for the string EDOLAN. If that string is found, the virus erases the sectors of C: and D: drives. The virus has a bug, as a result the infected files of small length being executed halt the system. The virus contains the text strings:
COMMAND.COM
*.DBF
*.COM

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Hi Family

Description Hi Family

These are memory resident parasitic viruses. Upon being executed, they decrease the DOS memory size (word at address 0000:0413), and install themselves into the memory by correcting the MCB blocks. Then they hook INT 21h, and write themselves to the end of EXE files that are executed. "Hi.378" infects COM files only.
The viruses contain the following text strings:
"Hi.460,512": Hi
"Hi.549": ACE OF BASE
"Hi.671": ACE OF BASE 2
"Hi.802": AOB 3

"Hi.378, 460," and "512" are harmless viruses, and do not manifest themselves in any way.
"Hi.549" hooks INT 17h, and disables printing. On October 31st, it corrupts CMOS memory and deletes files that are executed.
"Hi.671" hooks INT 17h, and changes the symbols that are printed: 'V' -> 'D', and 'b' -> 'j'. On October 31st, it deletes files that are executed. On August 29th, it disables INT 14h (COM ports).
On August 30th, "Hi.680" erases the disk sector, and "Hi.764" halts a computer. These viruses display the following messages:
"Hi.680":
Ha!Ha!!Ha!!!
You Have The Raveica Virus V1.3!

"Hi.764":
Ha!Ha!!Ha!!!
Ai un virus!
Pt. obtinerea devirusorului grabiti-va sa-l felicitati
astazi pe Claudiu Raveica cu ocazia zilei de nastere
Adresa:Str:Marasesti Bl:11 App:15
Oras:Bacau Jud:Bacau Cod:5500
Bing cu bang

"Hi.802" sometimes hooks INT 14h and 17h, and disables printers and COM ports.
"Hi.892": starting from October 24th, this virus hooks INT 08h and displays the following message:
NU MAI MISCA MOUSE-ul!
CA "A LOVESTI PESTE
COAIE

"Hi.895": starting from October 2nd, it hooks INT 08h (timer) and sometimes plays a tune.

Hi.924

Description Hi.924

It is not a dangerous memory resident parasitic virus. It hooks INT 21h and when any file is accessed, the virus searches for .EXE files and writes itself to the end of the file. Depending on its generation the virus hooks INT 1Ch and "flips" the screen. The virus contains the text strings:
*.EXE
IH

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