Function at 0x42fba0
Capabilities:
Check if file exists
Delete file
Encode data using xor
Read file on windows

Disassembly:
push 0xffffffffffffffff
push 0x43cbf8
mov eax, dword fs:[0]
push eax
sub esp, 0x28
mov eax, dword [0x44c274]
xor eax, esp
mov dword [esp + 0x24], eax
push ebx
push ebp
push esi
push edi
mov eax, dword [0x44c274]
xor eax, esp
push eax
lea eax, [esp + 0x3c]
mov dword fs:[0], eax
mov ebp, ecx
mov esi, dword [esp + 0x4c]
mov edi, dword [esp + 0x50]
lea ecx, [esp + 0x14]
mov dword [esp + 0x18], esi
mov dword [esp + 0x20], edi
call fcn.0042f930
push esi
lea ecx, [esp + 0x18]
mov dword [esp + 0x48], 0
call sub.SHLWAPI.dll_PathFileExistsA
test eax, eax
lea ecx, [esp + 0x14]
jne 0x42fc1b
mov dword [esp + 0x44], 0xffffffff
call fcn.0042f410
xor eax, eax
jmp 0x42fddc
push edi
call sub.SHLWAPI.dll_PathFileExistsA
test eax, eax
je 0x42fc2c
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
mov ecx, dword [0x44309c]
mov eax, dword [str.echoyu_1981]
mov edx, dword [0x4430a0]
mov dword [esp + 0x30], ecx
push esi
lea ecx, [esp + 0x18]
mov dword [esp + 0x30], eax
mov dword [esp + 0x38], edx
call fcn.0042f420
lea ebx, [esp + 0x2c]
mov edi, eax
lea eax, [ebx + 1]
lea esp, [esp]
mov cl, byte [ebx]
add ebx, 1
test cl, cl
jne 0x42fc60
sub ebx, eax
push 2
push 0
mov eax, ebx
neg eax
push eax
push edi
call dword [sym.imp.KERNEL32.dll_SetFilePointer]
push ebx
call fcn.004149ca
add esp, 4
push 0
lea ecx, [esp + 0x20]
push ecx
mov esi, eax
push ebx
push esi
push edi
mov dword [esi], 0
call dword [sym.imp.KERNEL32.dll_ReadFile]
mov ecx, ebp
call fcn.0042f940
xor ecx, ecx
test ebx, ebx
mov dword [esp + 0x24], eax
mov dword [esp + 0x28], edx
jle 0x42fcbb
xor byte [ecx + esi], al
add ecx, 1
cmp ecx, ebx
jl 0x42fcb1
mov byte [esi + ebx], 0
lea eax, [esp + 0x2c]
mov cl, byte [esi]
or ebp, 0xffffffff
cmp cl, byte [eax]
jne 0x42fce6
test cl, cl
je 0x42fce2
mov cl, byte [esi + 1]
cmp cl, byte [eax + 1]
jne 0x42fce6
add esi, 2
add eax, 2
test cl, cl
jne 0x42fcc3
xor eax, eax
jmp 0x42fcea
sbb eax, eax
sbb eax, ebp
test eax, eax
lea ecx, [esp + 0x14]
je 0x42fd02
mov dword [esp + 0x44], ebp
call fcn.0042f410
xor eax, eax
jmp 0x42fddc
mov edx, dword [esp + 0x18]
push edx
call fcn.0042f540
push 0
push 0
push 0
push edi
mov dword [esp + 0x28], eax
call dword [sym.imp.KERNEL32.dll_SetFilePointer]
mov eax, dword [esp + 0x18]
push eax
call fcn.004149ca
mov ecx, dword [esp + 0x1c]
push ecx
mov esi, eax
push 0
push esi
call fcn.00414950
add esp, 0x10
test edi, edi
jne 0x42fd51
lea ecx, [esp + 0x14]
mov dword [esp + 0x44], ebp
call fcn.0042f410
xor eax, eax
jmp 0x42fddc
mov eax, dword [esp + 0x18]
push 0
lea edx, [esp + 0x20]
push edx
push eax
push esi
push edi
call dword [sym.imp.KERNEL32.dll_ReadFile]
mov ecx, dword [esp + 0x1c]
xor eax, eax
test ecx, ecx
jle 0x42fd8a
mov dl, byte [esp + 0x18]
sub dl, bl
mov cl, dl
xor cl, byte [esp + 0x24]
add eax, 1
xor byte [eax + esi - 1], cl
mov ecx, dword [esp + 0x1c]
cmp eax, ecx
jl 0x42fd75
mov edx, esi
sub edx, ebx
mov ebx, dword [sym.imp.KERNEL32.dll_CloseHandle]
push edi
mov byte [edx + ecx], 0
call ebx
mov eax, dword [esp + 0x20]
push eax
lea ecx, [esp + 0x18]
call fcn.0042f440
mov edi, eax
test edi, edi
lea ecx, [esp + 0x14]
je 0x42fcf2
push esi
push edi
call fcn.0042f4a0
push edi
call ebx
push esi
call fcn.00414e0e
add esp, 4
lea ecx, [esp + 0x14]
mov dword [esp + 0x44], ebp
call fcn.0042f410
mov eax, 1
mov ecx, dword [esp + 0x3c]
mov dword fs:[0], ecx
pop ecx
pop edi
pop esi
pop ebp
pop ebx
mov ecx, dword [esp + 0x24]
xor ecx, esp
call fcn.004144f2
add esp, 0x34
ret 8