Function at 0x1000f850
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 [0x10083040]
xor eax, esp
mov dword [esp + 0x50], eax
push ebx
push esi
push edi
mov edi, dword [0x10088378]
cmp dword [edi + 0x10], 0
je 0x1000fb33
call fcn.1000f4e0
test al, al
jne 0x1000fb33
mov ah, 2
mov byte [esp + 0x11], 0
mov cl, 0x66
mov byte [esp + 0xc], ah
mov al, 0x2c
mov byte [esp + 0x11], 0
mov dl, 0x71
lea esi, [esp + 0xd]
xor cl, ah
mov bl, 0x76
xor al, ah
mov byte [esp + 0xe], cl
xor dl, ah
mov byte [esp + 0xd], al
xor bl, ah
mov byte [esp + 0xf], dl
mov byte [esp + 0x10], bl
lea ecx, [esi + 1]
nop dword [eax + eax]
mov al, byte [esi]
inc esi
test al, al
jne 0x1000f8c0
sub esi, ecx
cmp dword [edi + 0x14], 0xf
mov ecx, edi
jbe 0x1000f8d3
mov ecx, dword [edi]
mov edx, dword [edi + 0x10]
lea eax, [esp + 0xd]
push esi
push eax
push ecx
call fcn.1000f310
add esp, 0xc
cmp eax, 0xffffffff
je 0x1000fb33
movaps xmm0, xmmword [0x1007c540]
xor ecx, ecx
push dword [0x10088088]
movups xmmword [esp + 0x1c], xmm0
mov dword [esp + 0x2c], 0x34373766
mov dword [esp + 0x30], 0x29632258
mov dword [esp + 0x34], 0x737360
nop word [eax + eax]
mov al, byte [esp + 0x1c]
xor byte [esp + ecx + 0x1d], al
inc ecx
cmp ecx, 0x1a
jb 0x1000f920
sub esp, 0x18
mov byte [esp + 0x4f], 0
mov edx, esp
lea ecx, [esp + 0x35]
xorps xmm0, xmm0
lea esi, [ecx + 1]
movups xmmword [edx], xmm0
mov dword [edx + 0x10], 0
mov dword [edx + 0x14], 0
mov al, byte [ecx]
inc ecx
test al, al
jne 0x1000f953
sub ecx, esi
lea eax, [esp + 0x35]
push ecx
push eax
mov ecx, edx
call fcn.10002130
lea eax, [esp + 0x50]
push eax
call fcn.1000bae0
add esp, 0x20
mov ecx, 0x1008837c
push eax
call fcn.10007470
mov ecx, dword [esp + 0x48]
cmp ecx, 0xf
jbe 0x1000f9b7
mov edx, dword [esp + 0x34]
inc ecx
mov eax, edx
cmp ecx, 0x1000
jb 0x1000f9ad
mov edx, dword [eax - 4]
add ecx, 0x23
sub eax, edx
add eax, 0xfffffffc
cmp eax, 0x1f
ja 0x1000fb64
push ecx
push edx
call fcn.1004d526
add esp, 8
mov eax, dword [0x10088378]
cmp dword [eax + 0x14], 0xf
jbe 0x1000f9c4
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 [0x10088390], 0xf
mov ecx, 0x1008837c
push 0
cmova ecx, dword [0x1008837c]
mov edi, eax
push 0x80
push 2
push 0
push 2
push 0x40000000
push ecx
mov dword [esp + 0x30], edi
call esi
mov esi, dword [sym.imp.KERNEL32.dll_CloseHandle]
mov ebx, eax
mov dword [esp + 0xc], ebx
cmp edi, 0xffffffff
je 0x1000fb17
cmp ebx, 0xffffffff
je 0x1000fb13
lea eax, [esp + 0x50]
xor bl, bl
push eax
push edi
call dword [sym.imp.KERNEL32.dll_GetFileSizeEx]
xor esi, esi
or esi, dword [esp + 0x50]
not esi
and esi, 1
add esi, 0x1f
push esi
call fcn.10058800
mov edi, eax
add esp, 4
test edi, edi
je 0x1000fb05
push 0
lea eax, [esp + 0x50]
push eax
push 4
push edi
push dword [esp + 0x24]
call dword [sym.imp.KERNEL32.dll_ReadFile]
test eax, eax
je 0x1000fa88
push 0
lea eax, [esp + 0x50]
push eax
push dword [esp + 0x54]
push edi
push dword [esp + 0x1c]
call dword [sym.imp.KERNEL32.dll_WriteFile]
push esi
push 0
push edi
call fcn.1004f640
add esp, 0xc
mov dword [esp + 0x4c], 0
nop dword [eax]
push 0
lea eax, [esp + 0x50]
push eax
push esi
push edi
push dword [esp + 0x24]
call dword [sym.imp.KERNEL32.dll_ReadFile]
test eax, eax
je 0x1000faf8
cmp dword [esp + 0x4c], esi
mov eax, 1
movzx ebx, bl
cmovb ebx, eax
lea eax, [esp + 0x4c]
push eax
push edi
push 0
push 1
push 0
push dword [0x1008808c]
call dword [sym.imp.ADVAPI32.dll_CryptDecrypt]
test eax, eax
je 0x1000faf8
push 0
lea eax, [esp + 0x50]
push eax
push dword [esp + 0x54]
push edi
push dword [esp + 0x1c]
call dword [sym.imp.KERNEL32.dll_WriteFile]
test bl, bl
je 0x1000faa0
push edi
call fcn.10057d00
add esp, 4
mov esi, dword [sym.imp.KERNEL32.dll_CloseHandle]
mov ebx, dword [esp + 0xc]
mov edi, dword [esp + 0x14]
test edi, edi
je 0x1000fb1a
push edi
call esi
test ebx, ebx
je 0x1000fb52
push ebx
call esi
pop edi
pop esi
pop ebx
mov ecx, dword [esp + 0x50]
xor ecx, esp
call fcn.1004d4c5
mov esp, ebp
pop ebp
ret
cmp edi, 0x1008837c
je 0x1000fb52
cmp dword [edi + 0x14], 0xf
mov eax, dword [edi + 0x10]
jbe 0x1000fb46
mov edi, dword [edi]
push eax
push edi
mov ecx, 0x1008837c
call fcn.10001e50
mov ecx, dword [esp + 0x5c]
pop edi
pop esi
pop ebx
xor ecx, esp
call fcn.1004d4c5
mov esp, ebp
pop ebp
ret
call fcn.100527f4
int3