ECX MOV, 30
MOV eax, 0cccccccch
REP STOS DWORD PRT ES: [edi]
STOS instruction, its function is the address of the data placed in eax edi referred to in the same time, increases edi 4 bytes, REP the instructions repeated often in ecx filled .
Brackets denotes a memory , that address is actually edi points to the address of the content. Stos here corresponds stosd fact, there are other
stosb, stosw were treated 4,1,2 bytes, here 30h * 4 bytes of initializing the stack is 0CCH (i.e. machine code int 3's) so actually execute outside the event
contents of the stack which will lead to modal interrupted.