Function at 0x1000bb40
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
and esp, 0xfffffff8
sub esp, 0x54
mov eax, dword [0x1004e018]
xor eax, esp
mov dword [esp + 0x50], eax
push ebx
push esi
mov esi, dword [0x10050280]
push edi
mov edi, 0x10050284
cmp dword [esi + 0x10], 0
je 0x1000bdff
cmp dword [0x10050298], 0x10
mov eax, edi
cmovae eax, dword [0x10050284]
cmp dword [esi + 0x14], 0x10
jb 0x1000bb86
mov ecx, dword [esi]
jmp 0x1000bb88
mov ecx, esi
push dword [0x10050294]
mov edx, dword [esi + 0x10]
push eax
call fcn.1000b850
add esp, 8
test eax, eax
je 0x1000bdff
mov ah, 0x55
mov byte [esp + 0x11], 0
mov bl, 0x7b
mov byte [esp + 0xc], ah
mov al, 0x31
mov byte [esp + 0x11], 0
mov cl, 0x26
mov dl, 0x21
xor bl, ah
xor al, ah
xor cl, ah
mov byte [esp + 0xd], bl
xor dl, ah
mov byte [esp + 0xe], al
mov byte [esp + 0xf], cl
mov byte [esp + 0x10], dl
test bl, bl
jne 0x1000bbda
xor ecx, ecx
jmp 0x1000bbea
lea ecx, [esp + 0xd]
lea edx, [ecx + 1]
mov al, byte [ecx]
inc ecx
test al, al
jne 0x1000bbe1
sub ecx, edx
push ecx
push ecx
lea eax, [esp + 0x15]
mov ecx, esi
push eax
call fcn.1000b6a0
cmp eax, 0xffffffff
je 0x1000bdf9
movaps xmm0, xmmword [0x100489f0]
xor ecx, ecx
push dword [0x1004ff68]
movups xmmword [esp + 0x1c], xmm0
mov dword [esp + 0x2c], 0xe0d0d5c
mov dword [esp + 0x30], 0x13591862
mov dword [esp + 0x34], 0x49495a
nop dword [eax]
mov al, byte [esp + 0x1c]
xor byte [esp + ecx + 0x1d], al
inc ecx
cmp ecx, 0x1a
jb 0x1000bc30
sub esp, 0x18
mov byte [esp + 0x4f], 0
lea eax, [esp + 0x35]
mov ecx, esp
push eax
call fcn.10003ae0
lea eax, [esp + 0x50]
push eax
call fcn.10009320
add esp, 0x20
mov ecx, edi
push eax
call fcn.10009400
mov eax, dword [esp + 0x48]
cmp eax, 0x10
jb 0x1000bc7b
inc eax
push eax
push dword [esp + 0x38]
call fcn.10004c40
mov eax, dword [0x10050280]
cmp dword [eax + 0x14], 0x10
jb 0x1000bc88
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 [0x10050298], 0x10
mov edi, eax
push 0
push 0x80
push 2
push 0
push 2
mov eax, 0x10050284
mov dword [esp + 0x20], edi
cmovae eax, dword [0x10050284]
push 0x40000000
push eax
call esi
mov ebx, eax
mov dword [esp + 0x14], ebx
cmp edi, 0xffffffff
je 0x1000bdd3
cmp ebx, 0xffffffff
je 0x1000bdd3
lea eax, [esp + 0x50]
xor bl, bl
push eax
push edi
call dword [sym.imp.KERNEL32.dll_GetFileSizeEx]
mov eax, dword [esp + 0x54]
xor ecx, ecx
or ecx, dword [esp + 0x50]
and cl, 1
cdq
movzx edi, cl
neg edi
sbb edi, edi
add edi, 0x20
push edi
call dword [sym.imp.api_ms_win_crt_heap_l1_1_0.dll_malloc]
mov esi, eax
add esp, 4
test esi, esi
je 0x1000bdcb
push 0
lea eax, [esp + 0x50]
push eax
push 4
push esi
push dword [esp + 0x1c]
call dword [sym.imp.KERNEL32.dll_ReadFile]
test eax, eax
je 0x1000bd51
push 0
lea eax, [esp + 0x50]
push eax
push dword [esp + 0x54]
push esi
push dword [esp + 0x24]
call dword [sym.imp.KERNEL32.dll_WriteFile]
push edi
push 0
push esi
call sub.VCRUNTIME140.dll_memset
add esp, 0xc
mov dword [esp + 0x4c], 0
push 0
lea eax, [esp + 0x50]
push eax
push edi
push esi
push dword [esp + 0x1c]
call dword [sym.imp.KERNEL32.dll_ReadFile]
test eax, eax
je 0x1000bdbd
cmp dword [esp + 0x4c], edi
mov eax, 1
movzx ebx, bl
cmovb ebx, eax
lea eax, [esp + 0x4c]
push eax
push esi
push 0
push 1
push 0
push dword [0x1004ff6c]
call dword [sym.imp.ADVAPI32.dll_CryptDecrypt]
test eax, eax
je 0x1000bdbd
push 0
lea eax, [esp + 0x50]
push eax
push dword [esp + 0x54]
push esi
push dword [esp + 0x24]
call dword [sym.imp.KERNEL32.dll_WriteFile]
test bl, bl
je 0x1000bd65
push esi
call dword [sym.imp.api_ms_win_crt_heap_l1_1_0.dll_free]
add esp, 4
mov edi, dword [esp + 0xc]
mov ebx, dword [esp + 0x14]
mov esi, dword [sym.imp.KERNEL32.dll_CloseHandle]
test edi, edi
je 0x1000bde0
push edi
call esi
test ebx, ebx
je 0x1000be13
push ebx
call esi
pop edi
pop esi
pop ebx
mov ecx, dword [esp + 0x50]
xor ecx, esp
call fcn.1003de80
mov esp, ebp
pop ebp
ret
mov esi, dword [0x10050280]
cmp esi, 0x10050284
je 0x1000be13
push 0xffffffffffffffff
push 0
push esi
mov ecx, edi
call fcn.100045d0
mov ecx, dword [esp + 0x5c]
pop edi
pop esi
pop ebx
xor ecx, esp
call fcn.1003de80
mov esp, ebp
pop ebp
ret