Function at 0x100099e1
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 [0x1004e014]
xor eax, ebp
mov dword [ebp - 4], eax
push ebx
push esi
mov esi, dword [0x1005445c]
xor ebx, ebx
push edi
cmp dword [esi + 0x10], ebx
je 0x10009c13
mov ecx, esi
call fcn.10009600
test al, al
jne 0x10009c13
mov cl, 0xb
mov dword [ebp - 0x18], 0x786f250b
mov word [ebp - 0x14], 0x7f
mov edx, ebx
xor cl, byte [ebp + edx - 0x17]
mov byte [ebp + edx - 0x17], cl
inc edx
cmp edx, 4
jae 0x10009a38
mov cl, byte [ebp - 0x18]
jmp 0x10009a25
lea ecx, [ebp - 0x17]
mov byte [ebp - 0x13], bl
call fcn.1000408d
push eax
push ecx
lea eax, [ebp - 0x17]
mov ecx, esi
push eax
call fcn.10009572
cmp eax, 0xffffffff
je 0x10009c0d
movaps xmm0, xmmword [0x100477b0]
mov ecx, ebx
push dword [0x100500e8]
movups xmmword [ebp - 0x38], xmm0
mov dword [ebp - 0x28], 0x7f7c7c2d
mov dword [ebp - 0x24], 0x62286913
mov dword [ebp - 0x20], 0x38382b
mov al, byte [ebp - 0x38]
xor byte [ebp + ecx - 0x37], al
inc ecx
cmp ecx, 0x1a
jb 0x10009a81
sub esp, 0x18
mov byte [ebp - 0x1d], bl
lea eax, [ebp - 0x37]
mov ecx, esp
push eax
call fcn.100040a5
lea eax, [ebp - 0x50]
push eax
call fcn.10003b8a
add esp, 0x20
mov edi, 0x10054460
mov ecx, edi
push eax
call fcn.10006e48
xor eax, eax
lea ecx, [ebp - 0x50]
push ebx
inc eax
push eax
call fcn.10003f51
mov eax, dword [0x1005445c]
cmp dword [eax + 0x14], 0x10
jb 0x10009ad2
mov eax, dword [eax]
mov esi, dword [sym.imp.KERNEL32.dll_CreateFileA]
push ebx
mov ebx, 0x80
push ebx
push 3
push 0
push 3
push 0x80000000
push eax
call esi
cmp dword [0x10054474], 0x10
push 0
cmovae edi, dword [0x10054460]
push ebx
push 2
push 0
push 2
push 0x40000000
push edi
mov dword [ebp - 0x1c], eax
call esi
mov ebx, eax
mov eax, dword [ebp - 0x1c]
cmp eax, 0xffffffff
je 0x10009bf7
cmp ebx, 0xffffffff
je 0x10009bf7
lea ecx, [ebp - 0x10]
mov byte [ebp - 0x18], 0
push ecx
push eax
call dword [sym.imp.KERNEL32.dll_GetFileSizeEx]
mov eax, dword [ebp - 0xc]
xor ecx, ecx
or ecx, dword [ebp - 0x10]
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
pop ecx
test esi, esi
je 0x10009bf4
push 0
lea eax, [ebp - 8]
push eax
push 4
push esi
push dword [ebp - 0x1c]
call dword [sym.imp.KERNEL32.dll_ReadFile]
test eax, eax
je 0x10009b84
push 0
lea eax, [ebp - 8]
push eax
push dword [ebp - 8]
push esi
push ebx
call dword [sym.imp.KERNEL32.dll_WriteFile]
push edi
push 0
push esi
call sub.VCRUNTIME140.dll_memset
add esp, 0xc
and dword [ebp - 8], 0
push 0
lea eax, [ebp - 8]
push eax
push edi
push esi
push dword [ebp - 0x1c]
call dword [sym.imp.KERNEL32.dll_ReadFile]
test eax, eax
je 0x10009be6
mov eax, dword [ebp - 0x18]
cmp dword [ebp - 8], edi
push 1
pop ecx
movzx eax, al
cmovb eax, ecx
mov dword [ebp - 0x18], eax
lea eax, [ebp - 8]
push eax
push esi
push 0
push ecx
push 0
push dword [0x100500ec]
call dword [sym.imp.ADVAPI32.dll_CryptDecrypt]
test eax, eax
je 0x10009be6
push 0
lea eax, [ebp - 8]
push eax
push dword [ebp - 8]
push esi
push ebx
call dword [sym.imp.KERNEL32.dll_WriteFile]
cmp byte [ebp - 0x18], 0
je 0x10009b94
push esi
call dword [sym.imp.api_ms_win_crt_heap_l1_1_0.dll_free]
pop ecx
mov eax, dword [ebp - 0x1c]
mov esi, dword [sym.imp.KERNEL32.dll_CloseHandle]
test eax, eax
je 0x10009c04
push eax
call esi
test ebx, ebx
je 0x10009c27
push ebx
call esi
jmp 0x10009c27
mov esi, dword [0x1005445c]
mov edi, 0x10054460
cmp esi, edi
je 0x10009c27
push 0xffffffffffffffff
push ebx
push esi
mov ecx, edi
call fcn.10003d30
mov ecx, dword [ebp - 4]
pop edi
pop esi
xor ecx, ebp
pop ebx
call fcn.10037f95
mov esp, ebp
pop ebp
ret