Function at 0x4037f2
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]
and eax, 0xbfffffff
mov dword [0x42f0e0], eax
cmp ax, 6
je 0x403844
push ebx
call fcn.00406217
cmp eax, ebx
je 0x403844
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.004061a9
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], bl
jne 0x403849
push 0xb
call fcn.00406217
push 9
call fcn.00406217
push 7
mov dword [0x42f0e4], eax
call fcn.00406217
cmp eax, ebx
je 0x40388e
push 0x1e
call eax
test eax, eax
je 0x40388e
or dword [0x42f0e0], 0x40000000
push ebp
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
push ebx
push 0x160
mov dword [0x42f1d8], eax
lea eax, [esp + 0x3c]
push eax
push ebx
push 0x40845f
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x42e8e0
call fcn.00406055
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
push eax
mov ebp, 0x435000
push ebp
call fcn.00406055
cmp byte [0x435000], 0x22
mov dword [0x42f0ec], 0x400000
mov eax, ebp
jne 0x4038f8
mov byte [esp + 0x14], 0x22
mov eax, 0x435001
push dword [esp + 0x14]
push eax
call fcn.00405c4c
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [esp + 0x1c], eax
jmp 0x40397d
cmp cl, 0x20
jne 0x40391a
inc eax
cmp byte [eax], 0x20
je 0x403914
cmp byte [eax], 0x22
mov byte [esp + 0x14], 0x20
jne 0x40392a
inc eax
mov byte [esp + 0x14], 0x22
cmp byte [eax], 0x2f
jne 0x40396d
inc eax
cmp byte [eax], 0x53
jne 0x40394b
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x403941
cmp cl, bl
jne 0x40394b
mov dword [0x42f1c0], 1
cmp dword [eax], 0x4352434e
jne 0x403964
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x40395f
cmp cl, bl
jne 0x403964
or dword [esp + 0x20], 4
cmp dword [eax - 2], 0x3d442f20
je 0x403985
push dword [esp + 0x14]
push eax
call fcn.00405c4c
cmp byte [eax], 0x22
jne 0x40397d
inc eax
mov cl, byte [eax]
cmp cl, bl
jne 0x40390f
jmp 0x403996
mov byte [eax - 2], bl
add eax, 2
push eax
push 0x435400
call fcn.00406055
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
mov esi, 0x436400
push esi
push 0x400
call edi
call fcn.00403797
test eax, eax
jne 0x403a08
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatA
call fcn.00403797
test eax, eax
jne 0x403a08
push esi
push 0x3fc
call edi
push 0x408448
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 0x40843c
call edi
call fcn.00403797
test eax, eax
je 0x403a89
push 0x436000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push dword [esp + 0x20]
call fcn.0040346f
mov dword [esp + 0x10], eax
cmp eax, ebx
jne 0x403a89
cmp dword [0x42f148], ebx
je 0x403a79
push ebx
push ebp
call fcn.00405c4c
mov edi, eax
jmp 0x403a40
cmp dword [edi], 0x3d3f5f20
je 0x403a44
dec edi
cmp edi, ebp
jae 0x403a37
mov dword [esp + 0x10], str.Error_launching_installer
cmp edi, ebp
jb 0x403ab5
mov byte [edi], bl
add edi, 4
push edi
call fcn.004063bf
test eax, eax
je 0x403a89
push edi
push 0x435400
call fcn.00406055
push edi
push 0x435800
call fcn.00406055
mov dword [esp + 0x10], ebx
or dword [0x42f1cc], 0xffffffff
call fcn.00405805
mov dword [esp + 0x18], eax
call fcn.004037c8
call dword [sym.imp.ole32.dll_OleUninitialize]
pop ebp
cmp dword [esp + 0xc], ebx
je 0x403bae
push 0x200010
push dword [esp + 0x10]
call fcn.00405be6
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.004062cc
push str.nsu
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatA
cmp edi, ebx
je 0x403ad6
push 0x408430
push esi
call sub.KERNEL32.dll_lstrcatA
push str..tmp
push esi
call sub.KERNEL32.dll_lstrcatA
mov ebp, 0x435c00
push ebp
push esi
call dword [sym.imp.KERNEL32.dll_lstrcmpiA]
test eax, eax
je 0x403a89
push esi
cmp edi, ebx
je 0x403afe
call fcn.00405aca
jmp 0x403b03
call fcn.00405b4c
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
cmp byte [0x435400], bl
jne 0x403b1d
push ebp
push 0x435400
call fcn.00406055
push dword [esp + 0x1c]
push section..ndata
call fcn.00406055
push 0x41
pop eax
push 0x1a
mov word [0x430400], ax
pop ebp
mov edi, 0x429118
mov eax, dword [0x42f0f0]
push dword [eax + 0x120]
push edi
call fcn.00406441
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
cmp dword [esp + 0x10], ebx
je 0x403b99
push 1
push edi
push 0x436c00
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x403b99
push ebx
push edi
call fcn.00406802
mov eax, dword [0x42f0f0]
push dword [eax + 0x124]
push edi
call fcn.00406441
push edi
call fcn.00405b69
cmp eax, ebx
je 0x403b99
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esp + 0x10], ebx
inc byte [0x430400]
dec ebp
jne 0x403b3c
push ebx
push esi
call fcn.00406802
jmp 0x403a89
cmp dword [0x42f1b4], ebx
je 0x403c30
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
pop edi
test eax, eax
je 0x403c01
lea eax, [esp + 0x24]
push eax
push str.SeShutdownPrivilege
push ebx
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueA]
push ebx
push ebx
push ebx
lea eax, [esp + 0x2c]
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.00406217
mov esi, 0x80040002
cmp eax, ebx
je 0x403c1d
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x403c29
push esi
push edi
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403c30
push 9
call fcn.0040141a
mov eax, dword [0x42f1cc]
cmp eax, 0xffffffff
je 0x403c3e
mov dword [esp + 0x14], eax
push dword [esp + 0x14]
jmp 0x403aaf