Function at 0x4039a0
Capabilities:
Accept command line arguments
Check os version
Copy file
Delete file
Get common file path
Get file attributes
Get file system object information
Set current directory
Set environment variable
Shutdown system
Terminate process

Disassembly:
sub esp, 0x3f0
mov eax, dword [0x40b0f8]
xor eax, esp
mov dword [esp + 0x3ec], eax
push ebx
push ebp
push esi
push edi
call fcn.004085e0
xor edi, edi
mov ebx, str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
push 0x8001
mov dword [esp + 0x14], edi
mov ebp, edi
call dword [sym.imp.KERNEL32.dll_SetErrorMode]
call dword [sym.imp.KERNEL32.dll_IsDebuggerPresent]
test eax, eax
je 0x4039ee
push 1
call dword [sym.imp.KERNEL32.dll_GetCurrentProcess]
push eax
call dword [sym.imp.KERNEL32.dll_TerminateProcess]
lea eax, [esp + 0x2c]
mov dword [esp + 0x40], edi
xorps xmm0, xmm0
mov dword [esp + 0x2c], 0x11c
push eax
movlpd qword [esp + 0x144], xmm0
call dword [sym.imp.KERNEL32.dll_GetVersionExW]
push 0x53
pop esi
test eax, eax
jne 0x403a50
lea eax, [esp + 0x2c]
mov dword [esp + 0x2c], 0x114
push eax
call dword [sym.imp.KERNEL32.dll_GetVersionExW]
mov dl, 4
mov byte [esp + 0x146], dl
cmp word [esp + 0x40], si
jne 0x403a4c
mov eax, dword [esp + 0x5a]
add eax, 0xffffffd0
mov word [esp + 0x140], ax
jmp 0x403a57
xor eax, eax
jmp 0x403a42
mov dl, byte [esp + 0x146]
cmp dword [esp + 0x30], 0xa
jae 0x403a69
movzx eax, word [esp + 0x38]
mov dword [esp + 0x38], eax
jmp 0x403a6d
mov eax, dword [esp + 0x38]
mov dword [0x477e38], eax
movzx eax, byte [esp + 0x30]
shl ax, 8
movzx ecx, ax
movzx eax, byte [esp + 0x34]
or ecx, eax
movzx eax, byte [esp + 0x140]
shl ax, 8
shl ecx, 0x10
movzx eax, ax
or ecx, eax
movzx eax, dl
or ecx, eax
mov eax, 0x600
mov dword [0x477e3c], ecx
sar ecx, 0x10
cmp cx, ax
je 0x403acc
push edi
call fcn.00406dff
mov esi, eax
test esi, esi
je 0x403acc
push 0xc00
mov ecx, esi
call dword [0x4092cc]
call esi
mov esi, str.UXTHEME
push esi
call fcn.0040664c
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
inc esi
add esi, eax
cmp byte [esi], 0
jne 0x403ad1
push 0xc
call fcn.00406dff
push 0xa
call fcn.00406dff
push 8
mov dword [0x46fd30], eax
call fcn.00406dff
mov esi, eax
test esi, esi
je 0x403b1d
push 0x1e
mov ecx, esi
call dword [0x4092cc]
call esi
test eax, eax
je 0x403b1d
or byte [0x477e3c], 0x80
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push edi
call dword [sym.imp.ole32.dll_OleInitialize]
push edi
push 0x2b4
mov dword [0x477da0], eax
lea eax, [esp + 0x150]
push eax
push edi
push 0x40963c
call dword [sym.imp.SHELL32.dll_SHGetFileInfoW]
push str.NSIS_Error
push 0x46fd40
call fcn.0040704c
call dword [sym.imp.KERNEL32.dll_GetCommandLineW]
push eax
mov esi, 0x4c8000
push esi
call fcn.0040704c
movzx ecx, word [0x4c8000]
push 0x22
pop edi
push 0x20
pop edx
cmp cx, di
mov dword [0x46fd34], 0x400000
mov eax, edi
mov dword [esp + 0x14], edi
cmovne eax, edx
mov edx, 0x4c8002
movzx eax, ax
push eax
mov eax, esi
cmove eax, edx
push eax
call fcn.00406ae7
push eax
call dword [sym.imp.USER32.dll_CharNextW]
mov ecx, eax
mov edi, ecx
mov dword [esp + 0x18], edi
movzx eax, word [ecx]
test ax, ax
je 0x403c98
mov esi, eax
push 0x20
pop edx
movzx eax, si
cmp si, dx
jne 0x403bd4
add ecx, 2
movzx eax, word [ecx]
cmp ax, dx
je 0x403bc9
mov edi, edx
movzx esi, ax
movzx edx, ax
cmp ax, word [esp + 0x14]
jne 0x403bec
movzx edx, word [ecx + 2]
push 0x22
pop eax
mov edi, eax
cmp si, word [esp + 0x14]
lea eax, [ecx + 2]
cmovne eax, ecx
cmp dx, 0x2f
jne 0x403c56
push 0x53
add eax, 2
pop ecx
push 0x20
pop edx
cmp word [eax], cx
jne 0x403c23
movzx ecx, word [eax + 2]
cmp cx, dx
je 0x403c19
test cx, cx
jne 0x403c23
mov dword [0x477e20], 1
cmp dword [eax], 0x43004e
jne 0x403c45
cmp dword [eax + 4], 0x430052
jne 0x403c45
movzx ecx, word [eax + 8]
cmp cx, dx
je 0x403c42
test cx, cx
jne 0x403c45
or ebp, 4
cmp dword [eax - 4], 0x2f0020
jne 0x403c56
cmp dword [eax], 0x3d0044
je 0x403c80
push edi
push eax
call fcn.00406ae7
mov ecx, eax
push 0x22
pop esi
movzx eax, word [ecx]
mov edx, eax
cmp ax, si
jne 0x403c72
add ecx, 2
movzx edx, word [ecx]
movzx esi, dx
test dx, dx
jne 0x403bbe
jmp 0x403c94
xor ecx, ecx
mov word [eax - 4], cx
add eax, 4
push eax
push 0x4cc000
call fcn.0040704c
mov edi, dword [esp + 0x18]
mov esi, 0x4dc000
push esi
push 0x2000
call dword [sym.imp.KERNEL32.dll_GetTempPathW]
call fcn.00403fe0
test eax, eax
jne 0x403d0e
push 0x1ffb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryW]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatW
call fcn.00403fe0
test eax, eax
jne 0x403d0e
push esi
push 0x1ffc
call dword [sym.imp.KERNEL32.dll_GetTempPathW]
push 0x409664
push esi
call sub.KERNEL32.dll_lstrcatW
push esi
push str.TEMP
call dword [sym.imp.KERNEL32.dll_SetEnvironmentVariableW]
push esi
push 0x409678
call dword [sym.imp.KERNEL32.dll_SetEnvironmentVariableW]
call fcn.00403fe0
test eax, eax
je 0x403eef
push 0x4d8000
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
push ebp
call fcn.004035c2
mov ebx, eax
test ebx, ebx
jne 0x403eef
cmp dword [0x477d44], eax
je 0x403d96
xor ebp, ebp
push ebp
push 0x4c8000
call fcn.00406ae7
mov esi, eax
mov eax, 0x4c8000
jmp 0x403d5b
cmp dword [esi], 0x5f0020
jne 0x403d58
cmp dword [esi + 4], 0x3d003f
je 0x403d5f
sub esi, 2
cmp esi, eax
jae 0x403d47
mov ebx, str.Error_launching_installer
cmp esi, eax
jb 0x403da9
xor eax, eax
mov word [esi], ax
add esi, 8
push esi
call fcn.00406b29
test eax, eax
je 0x403ef3
push esi
push 0x4cc000
call fcn.0040704c
push esi
push 0x4d0000
call fcn.0040704c
mov ebx, ebp
or dword [0x477e2c], 0xffffffff
call fcn.00405e8e
mov ebp, eax
jmp 0x403ef3
call fcn.004069e0
push 0x4dc000
mov dword [esp + 0x1c], eax
call sub.KERNEL32.dll_lstrlenW
push edi
push section..ndata
mov esi, eax
call fcn.0040704c
cmp word [0x4cc000], bp
jne 0x403de1
push 0x4d4000
push 0x4cc000
call fcn.0040704c
xor edi, edi
lea eax, [esi*2 + 0x4dc000]
inc edi
mov dword [esp + 0x14], eax
mov esi, ebp
movzx ebp, di
push ebp
push str.nsu_X.tmp
push eax
call dword [sym.imp.USER32.dll_wsprintfW]
mov eax, dword [0x477d50]
add esp, 0xc
push dword [eax + 0x120]
push 0x48c000
call fcn.00406321
cmp dword [esp + 0x18], 0
push 0x4dc000
je 0x403e2c
call fcn.004062c6
jmp 0x403e31
call fcn.004062a6
test eax, eax
je 0x403e7e
push 0x48c000
call dword [sym.imp.KERNEL32.dll_GetFileAttributesW]
test eax, 0x400
jne 0x403f17
push 0x48c000
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
test eax, eax
je 0x403f17
push 1
push 0x4dc000
call fcn.00406c0a
mov eax, esi
inc esi
test eax, eax
jne 0x403f17
mov eax, dword [esp + 0x14]
jmp 0x403df4
push 0x4dc000
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryW]
push 0
push 0x4dc000
call fcn.00406702
push 1
push 0x48c000
push 0x4e4000
call dword [sym.imp.KERNEL32.dll_CopyFileW]
test eax, eax
je 0x403eef
push 0
push 0x48c000
call fcn.00406702
mov eax, dword [0x477d50]
push dword [eax + 0x124]
push 0x490000
call fcn.00406321
push 0x490000
call fcn.00406bc7
test eax, eax
jne 0x403f2a
mov eax, esi
inc esi
test eax, eax
jne 0x403eef
push 0x48c000
call fcn.00406ac0
test eax, eax
je 0x403e75
mov ebp, dword [esp + 0x10]
xor edi, edi
call fcn.00403957
call dword [sym.imp.ole32.dll_OleUninitialize]
test ebx, ebx
je 0x403f39
push 0x200010
push ebx
call fcn.00406fda
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
mov eax, dword [esp + 0x14]
inc edi
push 0
pop ebp
test di, di
jne 0x403def
jmp 0x403eef
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
xor edi, edi
mov ebx, edi
mov ebp, ebx
jmp 0x403ef5
cmp dword [0x477e14], 0
je 0x403fcc
lea eax, [esp + 0x18]
push eax
push 0x28
call dword [sym.imp.KERNEL32.dll_GetCurrentProcess]
push eax
call dword [sym.imp.ADVAPI32.dll_OpenProcessToken]
test eax, eax
je 0x403f92
lea eax, [esp + 0x20]
push eax
push str.SeShutdownPrivilege
push edi
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueW]
push edi
push edi
push edi
lea eax, [esp + 0x28]
mov dword [esp + 0x28], 1
push eax
push edi
push dword [esp + 0x2c]
mov dword [esp + 0x40], 2
call dword [sym.imp.ADVAPI32.dll_AdjustTokenPrivileges]
push 4
call fcn.00406dff
mov esi, eax
mov ebx, 0x80040002
test esi, esi
je 0x403fb8
push ebx
push 0x25
push edi
push edi
push edi
mov ecx, esi
call dword [0x4092cc]
call esi
test eax, eax
je 0x403fc5
push ebx
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403fcc
push 9
call fcn.0040156e
cmp dword [0x477e2c], 0xffffffff
cmovne ebp, dword [0x477e2c]
push ebp
jmp 0x403f11