Function at 0x403961
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, 0x17c
push ebx
push ebp
push esi
push edi
xor ebp, ebp
push 0x8001
mov dword [esp + 0x18], ebp
mov edi, str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
xor ebx, ebx
mov byte [esp + 0x14], 0x20
call dword [sym.imp.KERNEL32.dll_SetErrorMode]
call dword [sym.imp.KERNEL32.dll_GetVersion]
cmp ax, 6
je 0x4039a5
push ebx
call fcn.0040696f
test eax, eax
je 0x4039a5
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.0040616a
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
inc esi
add esi, eax
cmp byte [esi], bl
jne 0x4039aa
push 9
call fcn.0040696f
push 7
call fcn.0040696f
mov dword [0x443ff0], eax
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push 0
call dword [sym.imp.ole32.dll_OleInitialize]
push 0
push 0x160
mov dword [0x448064], eax
lea eax, [esp + 0x34]
push eax
push 0
push 0x408aea
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x444000
call fcn.00406b7d
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
push eax
mov esi, 0x471000
push esi
call fcn.00406b7d
push 0
call dword [sym.imp.KERNEL32.dll_GetModuleHandleA]
cmp byte [0x471000], 0x22
mov dword [0x443ff4], eax
mov eax, esi
jne 0x403a40
mov byte [esp + 0x10], 0x22
mov eax, 0x471001
push dword [esp + 0x10]
push eax
call fcn.00406550
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [esp + 0x18], eax
jmp 0x403ac1
push 0x20
pop edx
cmp cl, dl
jne 0x403a63
inc eax
cmp byte [eax], dl
je 0x403a5e
cmp byte [eax], 0x22
mov byte [esp + 0x10], dl
jne 0x403a72
inc eax
mov byte [esp + 0x10], 0x22
cmp byte [eax], 0x2f
jne 0x403ab1
inc eax
cmp byte [eax], 0x53
jne 0x403a92
mov cl, byte [eax + 1]
cmp cl, dl
je 0x403a88
test cl, cl
jne 0x403a92
mov dword [0x4480e0], 1
cmp dword [eax], 0x4352434e
jne 0x403aa8
mov cl, byte [eax + 4]
cmp cl, dl
je 0x403aa5
test cl, cl
jne 0x403aa8
or ebx, 4
cmp dword [eax - 2], 0x3d442f20
je 0x403ac9
push dword [esp + 0x10]
push eax
call fcn.00406550
cmp byte [eax], 0x22
jne 0x403ac1
inc eax
mov cl, byte [eax]
test cl, cl
jne 0x403a57
jmp 0x403adb
mov byte [eax - 2], 0
add eax, 2
push eax
push 0x473000
call fcn.00406b7d
mov esi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
push 0x47b000
push 0x2000
call esi
call fcn.00403ddc
test eax, eax
jne 0x403b61
push 0x1ffb
push 0x47b000
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push 0x47b000
call sub.KERNEL32.dll_lstrcatA
call fcn.00403ddc
test eax, eax
jne 0x403b61
push 0x47b000
push 0x1ffc
call esi
push 0x408b00
mov esi, 0x47b000
push esi
call sub.KERNEL32.dll_lstrcatA
push esi
mov esi, dword [sym.imp.KERNEL32.dll_SetEnvironmentVariableA]
push str.TEMP
call esi
push 0x47b000
push 0x408b0c
call esi
call fcn.00403ddc
test eax, eax
je 0x403d21
mov ebp, dword [sym.imp.KERNEL32.dll_DeleteFileA]
push 0x479000
call ebp
push ebx
call fcn.004035e7
mov edi, eax
test edi, edi
jne 0x403d1d
cmp dword [0x448000], eax
je 0x403bdd
xor ebx, ebx
push ebx
push 0x471000
call fcn.00406550
mov esi, eax
mov eax, 0x471000
jmp 0x403ba5
cmp dword [esi], 0x3d3f5f20
je 0x403ba9
dec esi
cmp esi, eax
jae 0x403b9c
mov edi, str.Error_launching_installer
cmp esi, eax
jb 0x403bf7
mov byte [esi], bl
add esi, 4
push esi
call fcn.0040658d
test eax, eax
je 0x403d19
push esi
push 0x473000
call fcn.00406b7d
push esi
push 0x475000
call fcn.00406b7d
mov edi, ebx
or dword [0x4480ec], 0xffffffff
call fcn.00405a89
push 1
mov ebp, eax
call fcn.00406636
jmp 0x403d21
call fcn.004063af
push str.nsu
push 0x47b000
mov esi, eax
call sub.KERNEL32.dll_lstrcatA
test esi, esi
je 0x403c20
push 0x408b18
push 0x47b000
call sub.KERNEL32.dll_lstrcatA
push str..tmp
push 0x47b000
call sub.KERNEL32.dll_lstrcatA
push 0x477000
push 0x47b000
call dword [sym.imp.KERNEL32.dll_lstrcmpiA]
test eax, eax
je 0x403d19
push 0x47b000
test esi, esi
je 0x403c57
call fcn.00405e7b
jmp 0x403c5c
call fcn.00405e5b
push 0x47b000
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
cmp byte [0x473000], bl
jne 0x403c7e
push 0x477000
push 0x473000
call fcn.00406b7d
push dword [esp + 0x18]
push section..ndata
call fcn.00406b7d
push 0x41
pop eax
push 0x1a
mov word [0x44b000], ax
pop esi
mov eax, dword [0x44800c]
push dword [eax + 0x120]
push 0x4281b0
call fcn.00405ef7
push 0x4281b0
call ebp
test edi, edi
je 0x403d05
push 1
push 0x4281b0
push 0x47f000
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x403d05
push ebx
push 0x4281b0
call fcn.00406206
mov eax, dword [0x44800c]
push dword [eax + 0x124]
push 0x4281b0
call fcn.00405ef7
push 0x4281b0
call fcn.004066ed
test eax, eax
je 0x403d05
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov edi, ebx
inc byte [0x44b000]
dec esi
jne 0x403c98
push ebx
push 0x47b000
call fcn.00406206
mov ebp, ebx
jmp 0x403d21
mov ebp, dword [esp + 0x14]
call fcn.0040391f
call dword [sym.imp.ole32.dll_OleUninitialize]
test edi, edi
je 0x403d43
push 0x200010
push edi
call fcn.00406b0b
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
cmp dword [0x4480d4], 0
je 0x403dc8
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
xor ebx, ebx
pop edi
test eax, eax
je 0x403d99
lea eax, [esp + 0x20]
push eax
push str.SeShutdownPrivilege
push ebx
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueA]
push ebx
push ebx
push ebx
lea eax, [esp + 0x28]
push eax
push ebx
push dword [esp + 0x2c]
mov dword [esp + 0x34], 1
mov dword [esp + 0x40], edi
call dword [sym.imp.ADVAPI32.dll_AdjustTokenPrivileges]
push 4
call fcn.0040696f
mov esi, 0x80040002
test eax, eax
je 0x403db5
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x403dc1
push esi
push edi
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403dc8
push 9
call fcn.0040142e
cmp dword [0x4480ec], 0xffffffff
cmovne ebp, dword [0x4480ec]
push ebp
jmp 0x403d3d