Function at 0x403993
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, 0x2d4
push ebx
push esi
push edi
push 0x20
pop edi
xor ebx, ebx
push 0x8001
mov dword [esp + 0x14], ebx
mov dword [esp + 0x10], str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
mov dword [esp + 0x1c], ebx
call dword [sym.imp.KERNEL32.dll_SetErrorMode]
call dword [sym.imp.KERNEL32.dll_GetVersion]
and eax, 0xbfffffff
mov dword [0x434a00], eax
cmp ax, 6
je 0x4039e3
push ebx
call fcn.00406502
cmp eax, ebx
je 0x4039e3
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00406492
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], bl
jne 0x4039e8
push 0xb
call fcn.00406502
push 9
call fcn.00406502
push 7
mov dword [0x434a04], eax
call fcn.00406502
cmp eax, ebx
je 0x403a2d
push 0x1e
call eax
test eax, eax
je 0x403a2d
or dword [0x434a00], 0x40000000
push ebp
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
push ebx
push 0x2b4
mov dword [0x434af8], eax
lea eax, [esp + 0x38]
push eax
push ebx
push 0x4085c0
call dword [sym.imp.SHELL32.dll_SHGetFileInfoW]
push str.NSIS_Error
push 0x433a00
call fcn.0040637d
call dword [sym.imp.KERNEL32.dll_GetCommandLineW]
push eax
mov ebp, 0x43f000
push ebp
call fcn.0040637d
push 0x22
pop esi
mov dword [0x434a0c], 0x400000
mov eax, ebp
cmp word [0x43f000], si
jne 0x403a97
mov edi, esi
mov eax, 0x43f002
push edi
push eax
call fcn.00405ebf
push eax
call dword [sym.imp.USER32.dll_CharNextW]
mov dword [esp + 0x18], eax
jmp 0x403b31
push 0x20
pop edi
cmp cx, di
jne 0x403abd
inc eax
inc eax
cmp word [eax], di
je 0x403ab6
mov edx, edi
cmp word [eax], si
jne 0x403ac8
inc eax
inc eax
mov edx, esi
cmp word [eax], 0x2f
jne 0x403b23
inc eax
inc eax
cmp word [eax], 0x53
jne 0x403aee
movzx ecx, word [eax + 2]
cmp cx, di
je 0x403ae4
cmp cx, bx
jne 0x403aee
mov dword [0x434ae0], 1
cmp dword [eax], 0x43004e
jne 0x403b12
cmp dword [eax + 4], 0x430052
jne 0x403b12
movzx ecx, word [eax + 8]
cmp cx, di
je 0x403b0d
cmp cx, bx
jne 0x403b12
or dword [esp + 0x1c], 4
cmp dword [eax - 4], 0x2f0020
jne 0x403b23
cmp dword [eax], 0x3d0044
je 0x403b3f
push edx
push eax
call fcn.00405ebf
cmp word [eax], si
jne 0x403b31
inc eax
inc eax
movzx ecx, word [eax]
cmp cx, bx
jne 0x403aae
jmp 0x403b53
xor ecx, ecx
mov word [eax - 4], cx
add eax, 4
push eax
push 0x43f800
call fcn.0040637d
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathW]
mov esi, 0x441800
push esi
push 0x400
call edi
call fcn.00403938
test eax, eax
jne 0x403bc5
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryW]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatW
call fcn.00403938
test eax, eax
jne 0x403bc5
push esi
push 0x3fc
call edi
push 0x408594
push esi
call sub.KERNEL32.dll_lstrcatW
mov edi, dword [sym.imp.KERNEL32.dll_SetEnvironmentVariableW]
push esi
push str.TEMP
call edi
push esi
push 0x408580
call edi
call fcn.00403938
test eax, eax
je 0x403c58
mov ebx, dword [sym.imp.KERNEL32.dll_DeleteFileW]
push 0x441000
call ebx
push dword [esp + 0x1c]
call fcn.00403610
mov dword [esp + 0x10], eax
test eax, eax
jne 0x403c56
cmp dword [0x434a68], eax
je 0x403c46
push eax
push ebp
call fcn.00405ebf
mov edi, eax
jmp 0x403c09
cmp dword [edi], 0x5f0020
jne 0x403c07
cmp dword [edi + 4], 0x3d003f
je 0x403c0d
dec edi
dec edi
cmp edi, ebp
jae 0x403bf6
mov dword [esp + 0x10], str.Error_launching_installer
cmp edi, ebp
jb 0x403c84
xor eax, eax
mov word [edi], ax
add edi, 8
push edi
call fcn.004066f0
test eax, eax
je 0x403c56
push edi
push 0x43f800
call fcn.0040637d
push edi
push 0x440000
call fcn.0040637d
and dword [esp + 0x10], 0
or dword [0x434aec], 0xffffffff
call fcn.00405a64
mov dword [esp + 0x14], eax
xor ebx, ebx
call fcn.00403969
call dword [sym.imp.ole32.dll_OleUninitialize]
pop ebp
cmp dword [esp + 0xc], ebx
je 0x403d80
push 0x200010
push dword [esp + 0x10]
call fcn.00405e59
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.004065ed
push 0x408574
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatW
test edi, edi
je 0x403ca5
push 0x408570
push esi
call sub.KERNEL32.dll_lstrcatW
push str..tmp
push esi
call sub.KERNEL32.dll_lstrcatW
mov ebp, 0x440800
push ebp
push esi
call dword [sym.imp.KERNEL32.dll_lstrcmpiW]
test eax, eax
je 0x403c56
push esi
test edi, edi
je 0x403ccd
call fcn.00405d3d
jmp 0x403cd2
call fcn.00405dbf
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryW]
cmp word [0x43f800], 0
jne 0x403cee
push ebp
push 0x43f800
call fcn.0040637d
push dword [esp + 0x18]
push section..ndata
call fcn.0040637d
push 0x1a
mov dword [0x435800], 0x41
pop ebp
mov edi, 0x42a538
mov eax, dword [0x434a10]
push dword [eax + 0x120]
push edi
call fcn.00406778
push edi
call ebx
cmp dword [esp + 0x10], 0
je 0x403d6a
push 1
push edi
push 0x442800
call dword [sym.imp.KERNEL32.dll_CopyFileW]
test eax, eax
je 0x403d6a
push 0
push edi
call fcn.00406b67
mov eax, dword [0x434a10]
push dword [eax + 0x124]
push edi
call fcn.00406778
push edi
call fcn.00405ddc
test eax, eax
je 0x403d6a
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
and dword [esp + 0x10], 0
inc word [0x435800]
dec ebp
jne 0x403d0e
push ebp
push esi
call fcn.00406b67
jmp 0x403c56
cmp dword [0x434ad4], ebx
je 0x403e04
lea eax, [esp + 0x14]
push eax
push 0x28
call dword [sym.imp.KERNEL32.dll_GetCurrentProcess]
push eax
call dword [sym.imp.ADVAPI32.dll_OpenProcessToken]
test eax, eax
je 0x403dd4
lea eax, [esp + 0x20]
push eax
push str.SeShutdownPrivilege
push ebx
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueW]
push ebx
push ebx
push ebx
lea eax, [esp + 0x28]
push eax
push ebx
push dword [esp + 0x28]
mov dword [esp + 0x34], 1
mov dword [esp + 0x40], 2
call dword [sym.imp.ADVAPI32.dll_AdjustTokenPrivileges]
push 4
call fcn.00406502
mov esi, 0x80040002
cmp eax, ebx
je 0x403df0
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x403dfd
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403e04
push 9
call fcn.0040141a
mov eax, dword [0x434aec]
cmp eax, 0xffffffff
je 0x403e12
mov dword [esp + 0x10], eax
push dword [esp + 0x10]
jmp 0x403c7e