Assembly Language for Beginners

5.11. ISADETECTION

mov esi, 659D1985h

Listing 5.8: random noise (x86-64)

lea esi, [rax+rdx*4+43558D29h]

loc_AF3: ; CODE XREF: seg000:0000000000000B46
rcl byte ptr [rsi+rax*8+29BB423Ah], 1
lea ecx, cs:0FFFFFFFFB2A6780Fh
mov al, 96h
mov ah, 0CEh
push rsp
lods byte ptr [esi]

db 2Fh ; /

pop rsp

db 64h

retf 0E993h

cmp ah, [rax+4Ah]

movzx rsi, dword ptr [rbp-25h]

push 4Ah

movzx rdi, dword ptr [rdi+rdx*8]

db 9Ah

rcr byte ptr [rax+1Dh], cl

lodsd

xor [rbp+6CF20173h], edx

xor [rbp+66F8B593h], edx

push rbx

sbb ch, [rbx-0Fh]

stosd

int 87h

db 46h, 4Ch

out 33h, rax

xchg eax, ebp

test ecx, ebp

movsd

leave

push rsp

db 16h

xchg eax, esi

pop rdi

loc_B3D: ; CODE XREF: seg000:0000000000000B5F
mov ds:93CA685DF98A90F9h, eax
jnz short near ptr loc_AF3+6
out dx, eax
cwde
mov bh, 5Dh ; ']'
movsb
pop rbp

Listing 5.9: random noise (ARM (ARM mode))

BLNE 0xFE16A9D8
BGE 0x1634D0C
SVCCS 0x450685
STRNVT R5, [PC],#-0x964
LDCGE p6, c14, [R0],#0x168
STCCSL p9, c9, [LR],#0x14C
CMNHIP PC, R10,LSL#22
FLDMIADNV LR!, {D4}
MCR p5, 2, R2,c15,c6, 4
BLGE 0x1139558
BLGT 0xFF9146E4