Function at 0x403986
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 [0x445a20], eax
cmp ax, 6
je 0x4039d6
push ebx
call fcn.004064c8
cmp eax, ebx
je 0x4039d6
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00406458
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], bl
jne 0x4039db
push 0xa
call fcn.004064c8
push 8
call fcn.004064c8
push 6
mov dword [0x445a24], eax
call fcn.004064c8
cmp eax, ebx
je 0x403a20
push 0x1e
call eax
test eax, eax
je 0x403a20
or dword [0x445a20], 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 [0x445b38], eax
lea eax, [esp + 0x38]
push eax
push ebx
push 0x4095c0
call dword [sym.imp.SHELL32.dll_SHGetFileInfoW]
push str.NSIS_Error
push 0x444a20
call fcn.0040635e
call dword [sym.imp.KERNEL32.dll_GetCommandLineW]
push eax
mov ebp, 0x450000
push ebp
call fcn.0040635e
push 0x22
pop esi
mov dword [0x445a2c], 0x400000
mov eax, ebp
cmp word [0x450000], si
jne 0x403a8a
mov edi, esi
mov eax, 0x450002
push edi
push eax
call fcn.00405ea0
push eax
call dword [sym.imp.USER32.dll_CharNextW]
mov dword [esp + 0x18], eax
jmp 0x403b24
push 0x20
pop edi
cmp cx, di
jne 0x403ab0
inc eax
inc eax
cmp word [eax], di
je 0x403aa9
mov edx, edi
cmp word [eax], si
jne 0x403abb
inc eax
inc eax
mov edx, esi
cmp word [eax], 0x2f
jne 0x403b16
inc eax
inc eax
cmp word [eax], 0x53
jne 0x403ae1
movzx ecx, word [eax + 2]
cmp cx, di
je 0x403ad7
cmp cx, bx
jne 0x403ae1
mov dword [0x445b20], 1
cmp dword [eax], 0x43004e
jne 0x403b05
cmp dword [eax + 4], 0x430052
jne 0x403b05
movzx ecx, word [eax + 8]
cmp cx, di
je 0x403b00
cmp cx, bx
jne 0x403b05
or dword [esp + 0x1c], 4
cmp dword [eax - 4], 0x2f0020
jne 0x403b16
cmp dword [eax], 0x3d0044
je 0x403b32
push edx
push eax
call fcn.00405ea0
cmp word [eax], si
jne 0x403b24
inc eax
inc eax
movzx ecx, word [eax]
cmp cx, bx
jne 0x403aa1
jmp 0x403b46
xor ecx, ecx
mov word [eax - 4], cx
add eax, 4
push eax
push 0x450800
call fcn.0040635e
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathW]
mov esi, 0x452800
push esi
push 0x400
call edi
call fcn.0040392b
test eax, eax
jne 0x403bb8
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryW]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatW
call fcn.0040392b
test eax, eax
jne 0x403bb8
push esi
push 0x3fc
call edi
push 0x409594
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 0x409580
call edi
call fcn.0040392b
test eax, eax
je 0x403c4b
mov ebx, dword [sym.imp.KERNEL32.dll_DeleteFileW]
push 0x452000
call ebx
push dword [esp + 0x1c]
call fcn.0040351e
mov dword [esp + 0x10], eax
test eax, eax
jne 0x403c49
cmp dword [0x445a98], eax
je 0x403c39
push eax
push ebp
call fcn.00405ea0
mov edi, eax
jmp 0x403bfc
cmp dword [edi], 0x5f0020
jne 0x403bfa
cmp dword [edi + 4], 0x3d003f
je 0x403c00
dec edi
dec edi
cmp edi, ebp
jae 0x403be9
mov dword [esp + 0x10], str.Error_launching_installer
cmp edi, ebp
jb 0x403c77
xor eax, eax
mov word [edi], ax
add edi, 8
push edi
call fcn.004066bc
test eax, eax
je 0x403c49
push edi
push 0x450800
call fcn.0040635e
push edi
push 0x451000
call fcn.0040635e
and dword [esp + 0x10], 0
or dword [0x445b2c], 0xffffffff
call fcn.00405a45
mov dword [esp + 0x14], eax
xor ebx, ebx
call fcn.0040395c
call dword [sym.imp.ole32.dll_OleUninitialize]
pop ebp
cmp dword [esp + 0xc], ebx
je 0x403d73
push 0x200010
push dword [esp + 0x10]
call fcn.00405e3a
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.004065b9
push 0x409574
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatW
test edi, edi
je 0x403c98
push 0x409570
push esi
call sub.KERNEL32.dll_lstrcatW
push str..tmp
push esi
call sub.KERNEL32.dll_lstrcatW
mov ebp, 0x451800
push ebp
push esi
call dword [sym.imp.KERNEL32.dll_lstrcmpiW]
test eax, eax
je 0x403c49
push esi
test edi, edi
je 0x403cc0
call fcn.00405d1e
jmp 0x403cc5
call fcn.00405da0
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryW]
cmp word [0x450800], 0
jne 0x403ce1
push ebp
push 0x450800
call fcn.0040635e
push dword [esp + 0x18]
push section..ndata
call fcn.0040635e
push 0x1a
mov dword [0x446800], 0x41
pop ebp
mov edi, 0x43b548
mov eax, dword [0x445a30]
push dword [eax + 0x120]
push edi
call fcn.00406744
push edi
call ebx
cmp dword [esp + 0x10], 0
je 0x403d5d
push 1
push edi
push 0x453800
call dword [sym.imp.KERNEL32.dll_CopyFileW]
test eax, eax
je 0x403d5d
push 0
push edi
call fcn.00406b33
mov eax, dword [0x445a30]
push dword [eax + 0x124]
push edi
call fcn.00406744
push edi
call fcn.00405dbd
test eax, eax
je 0x403d5d
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
and dword [esp + 0x10], 0
inc word [0x446800]
dec ebp
jne 0x403d01
push ebp
push esi
call fcn.00406b33
jmp 0x403c49
cmp dword [0x445b14], ebx
je 0x403df7
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 0x403dc7
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.004064c8
mov esi, 0x80040002
cmp eax, ebx
je 0x403de3
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x403df0
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403df7
push 9
call fcn.0040141a
mov eax, dword [0x445b2c]
cmp eax, 0xffffffff
je 0x403e05
mov dword [esp + 0x10], eax
push dword [esp + 0x10]
jmp 0x403c71