Function at 0x635f70
Capabilities:
Read file on windows
Write file on windows

Disassembly:
push r15
push r14
push r13
push r12
push rbp
push rdi
push rsi
push rbx
sub rsp, 0x68
mov qword [rsp + 0xb8], rdx
mov rax, qword [r8]
mov rbx, rcx
mov rsi, r8
test rdx, rdx
je 0x635feb
movzx ecx, byte [rsp + 0xb8]
mov rdi, rdx
mov edx, 1
add rdi, rdi
shlx edx, edx, ecx
movsxd rcx, edx
mov qword [rsp + 0x50], rdi
mov qword [rsp + 0x28], rcx
sub rax, rcx
cmp rdi, 1
jle 0x635fda
mov rdx, rdi
sar rdx, 1
neg rdx
cmp qword [rsp + 0x28], 0
mov qword [rsp + 0x58], rdx
jg 0x636016
add rsp, 0x68
pop rbx
pop rsi
pop rdi
pop rbp
pop r12
pop r13
pop r14
pop r15
ret
mov qword [rsp + 0x58], 0xffffffffffffffff
mov qword [rsp + 0xb8], 1
mov qword [rsp + 0x50], 2
mov qword [rsp + 0x28], 2
sub rax, 2
mov qword [rsp + 0x30], rax
mov qword [rsp + 0x48], 1
nop dword [rax]
mov rcx, qword [rsp + 0x48]
mov rax, qword [rsp + 0xb8]
mov rdi, qword [rsp + 0x58]
sub rax, rcx
add rdi, rcx
cmp rcx, qword [rsp + 0xb8]
cmovg rax, rdi
mov edi, 1
shlx rdi, rdi, rax
mov qword [rsp + 0x38], rdi
mov edi, 1
shlx edi, edi, eax
movsxd rax, edi
mov qword [rsp + 0x40], rax
xor ebp, ebp
mov rdi, rbp
nop word [rax + rax]
mov rcx, qword [rsp + 0x40]
mov rax, rdi
lea rdx, [rdi + rcx]
sub rax, rcx
test qword [rsp + 0x38], rdi
cmove rax, rdx
mov rdx, qword [rbx + 0x10]
add rax, qword [rsp + 0x30]
mov rcx, qword [rbx]
xor r8d, r8d
andn rdx, rdx, rax
shl edx, 5
call sub.msvcrt.dll_fseek
mov ecx, 0x20
call sub.msvcrt.dll_malloc
mov r9, qword [rbx]
mov r8d, 0x20
mov edx, 1
mov rcx, rax
mov r14, rax
call sub.msvcrt.dll_fread
cmp rax, 0x20
mov rax, qword [rsi]
mov r15d, 0
mov rdx, qword [rbx + 0x10]
cmovne r14, r15
mov rcx, qword [rbx]
sub rax, qword [rsp + 0x28]
xor r8d, r8d
andn rdx, rdx, rax
shl edx, 5
call sub.msvcrt.dll_fseek
mov ecx, 0x20
call sub.msvcrt.dll_malloc
mov r9, qword [rbx]
mov r8d, 0x20
mov edx, 1
mov rcx, rax
mov r13, rax
call sub.msvcrt.dll_fread
cmp rax, 0x20
mov edx, 1
mov ecx, 0x20
cmovne r13, r15
call sub.msvcrt.dll_calloc
mov rdx, qword [rsi]
mov r15, rax
lea rax, [rdx + rdx]
mov rcx, rax
not rcx
test rdx, rdx
cmovs rax, rcx
cmp rax, 0x7f
jbe 0x6362a0
xor edx, edx
nop dword [rax]
mov r8d, eax
mov ecx, edx
or r8d, 0xffffff80
shr rax, 7
mov byte [r15 + rcx], r8b
inc edx
cmp rax, 0x7f
ja 0x636160
add rdx, r15
mov byte [rdx], al
mov ecx, pe_nt_image_headers64
inc rdi
call sub.msvcrt.dll_malloc
mov r12, rax
mov rax, qword [rbx + 0x18]
vmovdqu xmm2, xmmword [r15]
vmovdqu xmm0, xmmword [rax]
vmovdqu xmm3, xmmword [r15 + 0x10]
vmovups xmmword [r12], xmm0
vmovdqu xmm1, xmmword [rax + 0x10]
vmovdqu xmm4, xmmword [r14]
vmovdqu xmm5, xmmword [r14 + 0x10]
vmovdqu xmm0, xmmword [r13]
vmovups xmmword [r12 + 0x10], xmm1
vmovdqu xmm1, xmmword [r13 + 0x10]
mov ecx, 0x20
vmovups xmmword [r12 + 0x20], xmm2
vmovups xmmword [r12 + 0x30], xmm3
vmovups xmmword [r12 + 0x40], xmm4
vmovups xmmword [r12 + 0x50], xmm5
vmovups xmmword [r12 + 0x60], xmm0
vmovups xmmword [r12 + 0x70], xmm1
call sub.msvcrt.dll_malloc
mov r8, rax
mov r9d, 0x20
mov edx, pe_nt_image_headers64
mov rcx, r12
mov rbp, rax
call fcn.00638940
mov rdx, qword [rbx + 0x10]
mov rcx, qword [rbx]
xor r8d, r8d
andn rdx, rdx, qword [rsi]
shl edx, 5
call sub.msvcrt.dll_fseek
mov r9, qword [rbx]
mov r8d, 0x20
mov edx, 1
mov rcx, rbp
call sub.msvcrt.dll_fwrite
inc qword [rsi]
mov rcx, rbp
call sub.msvcrt.dll_free
mov rcx, r12
call sub.msvcrt.dll_free
mov rcx, r14
call sub.msvcrt.dll_free
mov rcx, r13
call sub.msvcrt.dll_free
mov rcx, r15
call sub.msvcrt.dll_free
cmp rdi, qword [rsp + 0x28]
jne 0x636078
inc qword [rsp + 0x48]
mov rcx, qword [rsp + 0x28]
add qword [rsp + 0x30], rcx
mov rax, qword [rsp + 0x48]
cmp rax, qword [rsp + 0x50]
jl 0x636028
jmp 0x635fda
mov rdx, r15
jmp 0x63617c