Function at 0x403725
Capabilities:
Accept command line arguments
Check os version
Copy file
Delete file
Get common file path
Get file system object information
Set current directory
Set environment variable
Shutdown system
Terminate process

Disassembly:
sub esp, 0x184
push ebx
push esi
push edi
xor ebx, ebx
push 0x8001
mov dword [esp + 0x18], ebx
mov dword [esp + 0x10], str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
mov dword [esp + 0x20], ebx
mov byte [esp + 0x14], 0x20
call dword [sym.imp.KERNEL32.dll_SetErrorMode]
call dword [sym.imp.KERNEL32.dll_GetVersion]
cmp ax, 6
je 0x40376d
push ebx
call fcn.004069c7
cmp eax, ebx
je 0x40376d
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00406959
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], bl
jne 0x403772
push ebp
push 9
call fcn.004069c7
push 7
call fcn.004069c7
mov dword [0x448bc4], eax
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x448c78], eax
push ebx
lea eax, [esp + 0x38]
push 0x160
push eax
push ebx
push 0x42ad68
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x444bc0
call fcn.0040648a
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
mov ebp, 0x471000
push eax
push ebp
call fcn.0040648a
push ebx
call dword [sym.imp.KERNEL32.dll_GetModuleHandleA]
cmp byte [0x471000], 0x22
mov dword [0x448bc0], eax
mov eax, ebp
jne 0x403806
mov byte [esp + 0x14], 0x22
mov eax, 0x471001
push dword [esp + 0x14]
push eax
call fcn.00405f27
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [esp + 0x1c], eax
jmp 0x4038e0
cmp cl, 0x20
jne 0x40382b
inc eax
cmp byte [eax], 0x20
je 0x403825
cmp byte [eax], 0x22
mov byte [esp + 0x14], 0x20
jne 0x40383b
inc eax
mov byte [esp + 0x14], 0x22
cmp byte [eax], 0x2f
jne 0x4038d0
inc eax
cmp byte [eax], 0x53
jne 0x403860
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x403856
cmp cl, bl
jne 0x403860
mov dword [0x448c60], 1
movsx ecx, byte [0x40a867]
movsx edx, byte [0x40a866]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x40a865]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.NCRC]
shl ecx, 8
or ecx, edx
cmp dword [eax], ecx
jne 0x4038a0
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x40389b
cmp cl, bl
jne 0x4038a0
or dword [esp + 0x20], 4
movsx ecx, byte [0x40a85f]
movsx edx, byte [0x40a85e]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x40a85d]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.__D]
shl ecx, 8
or ecx, edx
cmp dword [eax - 2], ecx
je 0x4038ec
push dword [esp + 0x14]
push eax
call fcn.00405f27
cmp byte [eax], 0x22
jne 0x4038e0
inc eax
mov cl, byte [eax]
cmp cl, bl
jne 0x403820
jmp 0x4038fd
mov byte [eax - 2], bl
add eax, 2
push eax
push 0x473000
call fcn.0040648a
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
mov esi, 0x47b000
push esi
push 0x2000
call edi
call fcn.004036f4
test eax, eax
jne 0x40396f
push 0x1ffb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatA
call fcn.004036f4
test eax, eax
jne 0x40396f
push esi
push 0x1ffc
call edi
push 0x40a850
push esi
call sub.KERNEL32.dll_lstrcatA
mov edi, dword [sym.imp.KERNEL32.dll_SetEnvironmentVariableA]
push esi
push str.TEMP
call edi
push esi
push 0x40a844
call edi
call fcn.004036f4
test eax, eax
je 0x403a24
push 0x479000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push dword [esp + 0x20]
call fcn.004031b0
cmp eax, ebx
mov dword [esp + 0x10], eax
jne 0x403a24
cmp dword [0x448bdc], ebx
je 0x403a0d
push ebx
push ebp
call fcn.00405f27
mov edi, eax
cmp edi, ebp
jb 0x4039d8
movsx eax, byte [0x40a83f]
movsx ecx, byte [0x40a83e]
shl eax, 8
or eax, ecx
movsx ecx, byte [0x40a83d]
shl eax, 8
or eax, ecx
movsx ecx, byte [str.___]
shl eax, 8
or eax, ecx
cmp dword [edi], eax
je 0x4039d8
dec edi
cmp edi, ebp
jae 0x4039cf
cmp edi, ebp
mov dword [esp + 0x10], str.Error_launching_installer
jb 0x403a50
mov byte [edi], bl
add edi, 4
push edi
call fcn.00405fea
test eax, eax
je 0x403a24
push edi
push 0x473000
call fcn.0040648a
push edi
push 0x475000
call fcn.0040648a
mov dword [esp + 0x10], ebx
or dword [0x448c6c], 0xffffffff
call fcn.00403d05
push 1
mov dword [esp + 0x1c], eax
call fcn.0040678e
call fcn.00403bf2
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [esp + 0x10], ebx
pop ebp
je 0x403b58
push 0x200010
push dword [esp + 0x10]
call fcn.00405c2b
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.00405bae
push str.nsu
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatA
cmp edi, ebx
je 0x403a71
push 0x40a830
push esi
call sub.KERNEL32.dll_lstrcatA
push str..tmp
push esi
call sub.KERNEL32.dll_lstrcatA
mov ebp, 0x477000
push ebp
push esi
call dword [sym.imp.KERNEL32.dll_lstrcmpiA]
test eax, eax
je 0x403a24
cmp edi, ebx
push esi
je 0x403a99
call fcn.00405b14
jmp 0x403a9e
call fcn.00405b91
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
cmp byte [0x473000], bl
jne 0x403ab8
push ebp
push 0x473000
call fcn.0040648a
push dword [esp + 0x1c]
push section..ndata
call fcn.0040648a
movsx cx, byte [0x40a824]
xor eax, eax
push 0x1a
mov ah, byte [0x40a825]
pop ebp
or eax, ecx
mov edi, 0x428d68
mov word [0x44b000], ax
mov eax, dword [0x448bd0]
push dword [eax + 0x120]
push edi
call fcn.004064ac
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
cmp dword [esp + 0x10], ebx
je 0x403b43
push 1
push edi
push 0x47f000
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x403b43
push ebx
push edi
call fcn.00406345
mov eax, dword [0x448bd0]
push dword [eax + 0x124]
push edi
call fcn.004064ac
push edi
call fcn.00405bc6
cmp eax, ebx
je 0x403b43
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esp + 0x10], ebx
inc byte [0x44b000]
dec ebp
jne 0x403ae6
push ebx
push esi
call fcn.00406345
jmp 0x403a24
cmp dword [0x448c54], ebx
je 0x403bda
lea eax, [esp + 0x18]
push eax
push 0x28
call dword [sym.imp.KERNEL32.dll_GetCurrentProcess]
push eax
call dword [sym.imp.ADVAPI32.dll_OpenProcessToken]
push 2
test eax, eax
pop edi
je 0x403bab
lea eax, [esp + 0x24]
push eax
push str.SeShutdownPrivilege
push ebx
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueA]
push ebx
push ebx
lea eax, [esp + 0x28]
push ebx
push eax
push ebx
push dword [esp + 0x2c]
mov dword [esp + 0x38], 1
mov dword [esp + 0x44], edi
call dword [sym.imp.ADVAPI32.dll_AdjustTokenPrivileges]
push 4
call fcn.004069c7
cmp eax, ebx
mov esi, 0x80040002
je 0x403bc7
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x403bd3
push esi
push edi
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403bda
push 9
call fcn.0040140b
mov eax, dword [0x448c6c]
cmp eax, 0xffffffff
je 0x403be8
mov dword [esp + 0x14], eax
push dword [esp + 0x14]
call dword [sym.imp.KERNEL32.dll_ExitProcess]