To Zero out EAX we can use the following.
1 | AND EAX,554E4D4A |
If yo take 554E4D4A and convert it to binary you will get 1010101010011100100110101001010 if we then take
2A313235 and convert that to binary we get 101010001100010011001000110101. If we then AND both the binary together we get 0000000000000000000000000000000
1 | 1010101010011100100110101001010 |