Function at 0x1000ca00
Capabilities:
Encode data using xor
Get file size
Read file on windows
Write file on windows

Disassembly:
push ebp
mov ebp, esp
push 0xffffffffffffffff
push 0x1009c07d
mov eax, dword fs:[0]
push eax
sub esp, 0x70
mov eax, dword [0x100b7040]
xor eax, ebp
mov dword [ebp - 0x10], eax
push ebx
push esi
push edi
push eax
lea eax, [ebp - 0xc]
mov dword fs:[0], eax
mov edi, dword [ebp + 8]
mov dword [ebp - 0x44], edi
mov eax, dword [edi + 0x10]
test eax, eax
je 0x1000cade
cmp edi, 0x100b7b4c
je 0x1000ca5a
cmp dword [edi + 0x14], 0xf
mov ecx, edi
jbe 0x1000ca4e
mov ecx, dword [edi]
push eax
push ecx
mov ecx, 0x100b7b4c
call fcn.100057d0
cmp dword [edi + 0x14], 0xf
mov eax, edi
jbe 0x1000ca64
mov eax, dword [edi]
push 0
push 0x80
push 3
push 0
push 0
push connect
push eax
call dword [sym.imp.KERNEL32.dll_CreateFileA]
mov dword [ebp - 0x34], eax
cmp eax, 0xffffffff
jne 0x1000cae5
movaps xmm0, xmmword [0x100afc10]
xor ecx, ecx
movups xmmword [ebp - 0x7c], xmm0
mov dword [ebp - 0x4c], 0x4f4f581d
movaps xmm0, xmmword [0x100af540]
movups xmmword [ebp - 0x6c], xmm0
mov dword [ebp - 0x48], 0x374f52
movaps xmm0, xmmword [0x100af690]
movups xmmword [ebp - 0x5c], xmm0
mov al, byte [ebp - 0x7c]
xor byte [ebp + ecx - 0x7b], al
inc ecx
cmp ecx, 0x36
jb 0x1000cab6
cmp dword [edi + 0x14], 0xf
mov byte [ebp - 0x45], 0
jbe 0x1000cacf
mov edi, dword [edi]
push 0
lea eax, [ebp - 0x7b]
push eax
push edi
push 0
call dword [sym.imp.USER32.dll_MessageBoxA]
xor al, al
jmp 0x1000cd0e
mov dh, 0x73
mov byte [ebp - 0x35], 0
xor dl, dl
mov byte [ebp - 0x3c], dh
mov cl, 0x17
mov bl, 7
xor cl, dh
xor bl, dh
mov al, 0x5d
mov byte [ebp - 0x3a], cl
mov ah, 0x1e
mov byte [ebp - 0x38], bl
mov ch, 3
xor al, dh
xor dl, dh
mov byte [ebp - 0x3b], al
xor ah, dh
mov byte [ebp - 0x39], dl
xor ch, dh
mov byte [ebp - 0x37], ah
mov edx, dword [edi + 0x10]
mov byte [ebp - 0x36], ch
lea ecx, [ebp - 0x3b]
lea ebx, [ecx + 1]
mov al, byte [ecx]
inc ecx
test al, al
jne 0x1000cb21
mov eax, 0x7fffffff
sub ecx, ebx
sub eax, edx
cmp eax, ecx
jb 0x1000cd2c
cmp dword [edi + 0x14], 0xf
mov eax, edi
jbe 0x1000cb43
mov eax, dword [edi]
push ecx
lea ecx, [ebp - 0x3b]
push ecx
push edx
push eax
push ecx
push dword [ebp - 0x44]
lea ecx, [ebp - 0x2c]
call fcn.1000ed20
mov ebx, dword [ebp - 0x34]
lea eax, [ebp - 0x30]
push eax
mov dword [ebp - 4], 0
push ebx
mov dword [ebp - 0x30], 0
call dword [sym.imp.KERNEL32.dll_GetFileSize]
mov esi, eax
mov dword [ebp - 0x40], esi
test esi, esi
jne 0x1000cb94
push ebx
call dword [sym.imp.KERNEL32.dll_CloseHandle]
cmp dword [ebp - 0x18], 0xf
lea eax, [ebp - 0x2c]
cmova eax, dword [ebp - 0x2c]
xor bl, bl
jmp 0x1000ccd3
push esi
call fcn.100810e9
add esp, 4
mov dword [ebp - 0x34], eax
lea ecx, [ebp - 0x14]
mov dword [ebp - 0x14], 0
push 0
push ecx
push esi
push eax
push ebx
call dword [sym.imp.KERNEL32.dll_ReadFile]
push ebx
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov ebx, dword [ebp - 0x40]
mov edi, 0x816
mov eax, dword [ebp - 0x34]
xor esi, esi
nop word [eax + eax]
movzx ecx, byte [eax + esi]
mov edx, edi
add cx, di
shr edx, 8
xor dl, byte [eax + esi]
mov eax, 0x6081
movzx ecx, cx
imul ecx, eax
mov eax, 0x7105
add cx, ax
mov eax, dword [ebp - 0x34]
movzx edi, cx
mov byte [eax + esi], dl
inc esi
cmp esi, ebx
jb 0x1000cbd0
cmp dword [ebp - 0x18], 0xf
lea eax, [ebp - 0x2c]
push 0
cmova eax, dword [ebp - 0x2c]
push 0x80
push 2
push 0
push 0
push 0x40000000
push eax
call dword [sym.imp.KERNEL32.dll_CreateFileA]
push 0
mov esi, eax
lea eax, [ebp - 0x14]
push eax
push ebx
mov ebx, dword [ebp - 0x34]
push ebx
push esi
call dword [sym.imp.KERNEL32.dll_WriteFile]
mov edi, dword [sym.imp.KERNEL32.dll_CloseHandle]
push esi
call edi
push ebx
call fcn.100810e4
add esp, 4
lea eax, [ebp - 0x2c]
cmp dword [ebp - 0x18], 0xf
cmova eax, dword [ebp - 0x2c]
push 0
push 0x80
push 3
push 0
push 0
push connect
push eax
call dword [sym.imp.KERNEL32.dll_CreateFileA]
mov esi, eax
mov ecx, 0x100b7b34
push esi
call fcn.1000d4d0
push esi
mov bl, al
call edi
mov edi, dword [ebp - 0x44]
test bl, bl
jne 0x1000ccc8
movaps xmm0, xmmword [0x100afb30]
xor ecx, ecx
movups xmmword [ebp - 0x64], xmm0
movaps xmm0, xmmword [0x100ae9e0]
movups xmmword [ebp - 0x54], xmm0
nop
mov al, byte [ebp - 0x64]
xor byte [ebp + ecx - 0x63], al
inc ecx
cmp ecx, 0x1e
jb 0x1000cca0
cmp dword [edi + 0x14], 0xf
mov byte [ebp - 0x45], 0
jbe 0x1000ccb9
mov edi, dword [edi]
push 0
lea eax, [ebp - 0x63]
push eax
push edi
push 0
call dword [sym.imp.USER32.dll_MessageBoxA]
cmp dword [ebp - 0x18], 0xf
lea eax, [ebp - 0x2c]
cmova eax, dword [ebp - 0x2c]
push eax
call fcn.10088ea8
mov ecx, dword [ebp - 0x18]
add esp, 4
cmp ecx, 0xf
jbe 0x1000cd0c
mov edx, dword [ebp - 0x2c]
inc ecx
mov eax, edx
cmp ecx, 0x1000
jb 0x1000cd02
mov edx, dword [eax - 4]
add ecx, 0x23
sub eax, edx
add eax, 0xfffffffc
cmp eax, 0x1f
ja 0x1000cd31
push ecx
push edx
call fcn.100810d6
add esp, 8
mov al, bl
mov ecx, dword [ebp - 0xc]
mov dword fs:[0], ecx
pop ecx
pop edi
pop esi
pop ebx
mov ecx, dword [ebp - 0x10]
xor ecx, ebp
call fcn.10081075
mov esp, ebp
pop ebp
ret 4
call fcn.100023c0
call fcn.1008626f
int3