Function at 0x1000b3fa
Capabilities:
Encode data using xor
Encrypt or decrypt via wincrypt
Get file size
Read file on windows
Write file on windows

Disassembly:
push ebp
mov ebp, esp
sub esp, 0x50
mov eax, dword [0x10053040]
xor eax, ebp
mov dword [ebp - 4], eax
push ebx
push esi
mov esi, dword [0x10056ba0]
xor ebx, ebx
push edi
cmp dword [esi + 0x10], ebx
je 0x1000b610
mov ecx, esi
call fcn.1000b090
test al, al
jne 0x1000b610
mov cl, 4
mov dword [ebp - 0x18], 0x77602a04
mov word [ebp - 0x14], 0x70
mov eax, ebx
xor byte [ebp + eax - 0x17], cl
inc eax
cmp eax, 4
jae 0x1000b44d
mov cl, byte [ebp - 0x18]
jmp 0x1000b43e
push ecx
lea eax, [ebp - 0x17]
mov byte [ebp - 0x13], bl
push eax
call fcn.1000b8bf
cmp eax, 0xffffffff
je 0x1000b610
movaps xmm0, xmmword [0x1004c6b0]
mov ecx, ebx
push dword [0x10056898]
movups xmmword [ebp - 0x38], xmm0
mov dword [ebp - 0x28], 0x80b0b5a
mov dword [ebp - 0x24], 0x155f1e64
mov dword [ebp - 0x20], 0x4f4f5c
mov al, byte [ebp - 0x38]
xor byte [ebp + ecx - 0x37], al
inc ecx
cmp ecx, 0x1a
jb 0x1000b48b
sub esp, 0x18
mov byte [ebp - 0x1d], bl
lea eax, [ebp - 0x37]
mov ecx, esp
push eax
call fcn.10003da0
lea eax, [ebp - 0x50]
push eax
call fcn.100039e5
add esp, 0x20
mov ebx, 0x10056ba4
mov ecx, ebx
push eax
call fcn.10008af4
lea ecx, [ebp - 0x50]
call fcn.10003b9e
mov eax, dword [0x10056ba0]
cmp dword [eax + 0x14], 0xf
jbe 0x1000b4d7
mov eax, dword [eax]
mov esi, dword [sym.imp.KERNEL32.dll_CreateFileA]
push 0
push 0x80
push 3
push 0
push 3
push 0x80000000
push eax
call esi
cmp dword [0x10056bb8], 0xf
mov edi, eax
push 0
cmova ebx, dword [0x10056ba4]
push 0x80
push 2
push 0
push 2
push 0x40000000
push ebx
mov dword [ebp - 0x1c], edi
call esi
mov ebx, eax
cmp edi, 0xffffffff
je 0x1000b5fc
cmp ebx, 0xffffffff
je 0x1000b5f8
lea eax, [ebp - 0x10]
mov byte [ebp - 0x18], 0
push eax
push edi
call dword [sym.imp.KERNEL32.dll_GetFileSizeEx]
xor esi, esi
xor eax, eax
or esi, dword [ebp - 0x10]
inc eax
not esi
and esi, eax
add esi, 0x1f
push esi
call dword [sym.imp.api_ms_win_crt_heap_l1_1_0.dll_malloc]
mov edi, eax
pop ecx
test edi, edi
je 0x1000b5f5
push 0
lea eax, [ebp - 8]
push eax
push 4
push edi
push dword [ebp - 0x1c]
call dword [sym.imp.KERNEL32.dll_ReadFile]
test eax, eax
je 0x1000b585
push 0
lea eax, [ebp - 8]
push eax
push dword [ebp - 8]
push edi
push ebx
call dword [sym.imp.KERNEL32.dll_WriteFile]
push esi
push 0
push edi
call sub.VCRUNTIME140.dll_memset
add esp, 0xc
and dword [ebp - 8], 0
push 0
lea eax, [ebp - 8]
push eax
push esi
push edi
push dword [ebp - 0x1c]
call dword [sym.imp.KERNEL32.dll_ReadFile]
test eax, eax
je 0x1000b5e7
mov eax, dword [ebp - 0x18]
cmp dword [ebp - 8], esi
push 1
pop ecx
movzx eax, al
cmovb eax, ecx
mov dword [ebp - 0x18], eax
lea eax, [ebp - 8]
push eax
push edi
push 0
push ecx
push 0
push dword [0x1005689c]
call dword [sym.imp.ADVAPI32.dll_CryptDecrypt]
test eax, eax
je 0x1000b5e7
push 0
lea eax, [ebp - 8]
push eax
push dword [ebp - 8]
push edi
push ebx
call dword [sym.imp.KERNEL32.dll_WriteFile]
cmp byte [ebp - 0x18], 0
je 0x1000b595
push edi
call dword [sym.imp.api_ms_win_crt_heap_l1_1_0.dll_free]
pop ecx
mov edi, dword [ebp - 0x1c]
test edi, edi
je 0x1000b603
push edi
call dword [sym.imp.KERNEL32.dll_CloseHandle]
test ebx, ebx
je 0x1000b61b
push ebx
call dword [sym.imp.KERNEL32.dll_CloseHandle]
jmp 0x1000b61b
push esi
mov ecx, 0x10056ba4
call fcn.10007454
mov ecx, dword [ebp - 4]
pop edi
pop esi
xor ecx, ebp
pop ebx
call fcn.1003bff4
leave
ret