Function at 0x10015380
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 [0x100a2078]
xor eax, esp
mov dword [esp + 0x50], eax
cmp dword [ecx + 0x18], 0x10
lea edx, [ecx + 4]
push ebx
push esi
push edi
jb 0x100153a3
mov edx, dword [ecx + 4]
cmp byte [edx], 0
jne 0x100153ac
xor ecx, ecx
jmp 0x100153ba
mov ecx, edx
lea esi, [ecx + 1]
mov al, byte [ecx]
inc ecx
test al, al
jne 0x100153b1
sub ecx, esi
push ecx
mov edi, 0x100a5a98
push edx
mov ecx, edi
call fcn.10002710
mov esi, dword [0x100a5aa8]
mov ebx, 0x100a5ab0
test esi, esi
je 0x10015678
cmp dword [0x100a5ac4], 0x10
mov edx, ebx
mov ecx, edi
mov edi, dword [0x100a5ac0]
cmovae edx, dword [0x100a5ab0]
mov eax, edi
cmp dword [0x100a5aac], 0x10
cmovae ecx, dword [0x100a5a98]
cmp esi, edi
cmovb eax, esi
push eax
call fcn.10002cc0
add esp, 4
test eax, eax
jne 0x1001541f
cmp esi, edi
jb 0x1001541f
jbe 0x10015678
mov ah, 0x5d
mov byte [esp + 0x11], 0
mov bl, 0x73
mov byte [esp + 0xc], ah
mov al, 0x39
mov byte [esp + 0x11], 0
mov cl, 0x2e
mov dl, 0x29
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 0x10015457
xor ecx, ecx
jmp 0x10015469
lea ecx, [esp + 0xd]
lea edx, [ecx + 1]
nop
mov al, byte [ecx]
inc ecx
test al, al
jne 0x10015460
sub ecx, edx
push ecx
push ecx
lea eax, [esp + 0x15]
mov ebx, 0x100a5a98
push eax
mov ecx, ebx
call fcn.10004d00
cmp eax, 0xffffffff
je 0x10015673
movaps xmm0, xmmword [0x10098d10]
xor ecx, ecx
push dword [0x100a5640]
movups xmmword [esp + 0x1c], xmm0
mov dword [esp + 0x2c], 0x60636332
mov dword [esp + 0x30], 0x7d37760c
mov dword [esp + 0x34], 0x272734
mov al, byte [esp + 0x1c]
xor byte [esp + ecx + 0x1d], al
inc ecx
cmp ecx, 0x1a
jb 0x100154b1
sub esp, 0x18
mov byte [esp + 0x4f], 0
lea eax, [esp + 0x35]
mov ecx, esp
push eax
call fcn.10002810
lea eax, [esp + 0x50]
push eax
call fcn.1000bf20
add esp, 0x20
mov ecx, 0x100a5ab0
push eax
call fcn.1000e520
lea ecx, [esp + 0x34]
call fcn.100021c0
cmp dword [0x100a5aac], 0x10
mov esi, dword [sym.imp.KERNEL32.dll_CreateFileA]
cmovae ebx, dword [0x100a5a98]
push 0
push 0x80
push 3
push 0
push 3
push connect
push ebx
call esi
cmp dword [0x100a5ac4], 0x10
mov edi, eax
push 0
push 0x80
push 2
push 0
push 2
mov eax, 0x100a5ab0
mov dword [esp + 0x20], edi
cmovae eax, dword [0x100a5ab0]
push 0x40000000
push eax
call esi
mov ebx, eax
mov dword [esp + 0x14], ebx
cmp edi, 0xffffffff
je 0x1001564d
cmp ebx, 0xffffffff
je 0x1001564d
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 fcn.1006d7a1
mov esi, eax
add esp, 4
test esi, esi
je 0x10015645
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 0x100155ca
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 fcn.10068b00
add esp, 0xc
mov dword [esp + 0x4c], 0
nop
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 0x10015638
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 [0x100a5644]
call dword [sym.imp.ADVAPI32.dll_CryptDecrypt]
test eax, eax
je 0x10015638
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 0x100155e0
push esi
call fcn.1006d4ef
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 0x1001565a
push edi
call esi
test ebx, ebx
je 0x10015688
push ebx
call esi
pop edi
pop esi
pop ebx
mov ecx, dword [esp + 0x50]
xor ecx, esp
call fcn.10066135
mov esp, ebp
pop ebp
ret
mov ebx, 0x100a5ab0
push 0xffffffffffffffff
push 0
push 0x100a5a98
mov ecx, ebx
call fcn.100022d0
mov ecx, dword [esp + 0x5c]
pop edi
pop esi
pop ebx
xor ecx, esp
call fcn.10066135
mov esp, ebp
pop ebp
ret