Function at 0x4030d9
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]
cmp ax, 6
je 0x403121
push ebx
call fcn.00406092
cmp eax, ebx
je 0x403121
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00406024
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], bl
jne 0x403126
push ebp
push 9
call fcn.00406092
push 7
call fcn.00406092
mov dword [0x423704], eax
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x4237b8], eax
push ebx
lea eax, [esp + 0x38]
push 0x160
push eax
push ebx
push 0x41ecc8
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x422f00
call fcn.00405cf9
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
mov ebp, 0x429000
push eax
push ebp
call fcn.00405cf9
push ebx
call dword [sym.imp.KERNEL32.dll_GetModuleHandleA]
cmp byte [0x429000], 0x22
mov dword [0x423700], eax
mov eax, ebp
jne 0x4031ba
mov byte [esp + 0x14], 0x22
mov eax, 0x429001
push dword [esp + 0x14]
push eax
call fcn.00405796
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [esp + 0x1c], eax
jmp 0x403294
cmp cl, 0x20
jne 0x4031df
inc eax
cmp byte [eax], 0x20
je 0x4031d9
cmp byte [eax], 0x22
mov byte [esp + 0x14], 0x20
jne 0x4031ef
inc eax
mov byte [esp + 0x14], 0x22
cmp byte [eax], 0x2f
jne 0x403284
inc eax
cmp byte [eax], 0x53
jne 0x403214
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x40320a
cmp cl, bl
jne 0x403214
mov dword [0x4237a0], 1
movsx ecx, byte [0x409183]
movsx edx, byte [0x409182]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x409181]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.NCRC]
shl ecx, 8
or ecx, edx
cmp dword [eax], ecx
jne 0x403254
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x40324f
cmp cl, bl
jne 0x403254
or dword [esp + 0x20], 4
movsx ecx, byte [0x40917b]
movsx edx, byte [0x40917a]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x409179]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.__D]
shl ecx, 8
or ecx, edx
cmp dword [eax - 2], ecx
je 0x4032a0
push dword [esp + 0x14]
push eax
call fcn.00405796
cmp byte [eax], 0x22
jne 0x403294
inc eax
mov cl, byte [eax]
cmp cl, bl
jne 0x4031d4
jmp 0x4032b1
mov byte [eax - 2], bl
add eax, 2
push eax
push 0x429400
call fcn.00405cf9
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
mov esi, 0x42a400
push esi
push 0x400
call edi
call fcn.004030a8
test eax, eax
jne 0x403323
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatA
call fcn.004030a8
test eax, eax
jne 0x403323
push esi
push 0x3fc
call edi
push 0x40916c
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 0x409160
call edi
call fcn.004030a8
test eax, eax
je 0x4033d1
push 0x42a000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push dword [esp + 0x20]
call fcn.00402c66
cmp eax, ebx
mov dword [esp + 0x10], eax
jne 0x4033d1
cmp dword [0x42371c], ebx
je 0x4033c1
push ebx
push ebp
call fcn.00405796
mov edi, eax
cmp edi, ebp
jb 0x40338c
movsx eax, byte [0x40915b]
movsx ecx, byte [0x40915a]
shl eax, 8
or eax, ecx
movsx ecx, byte [0x409159]
shl eax, 8
or eax, ecx
movsx ecx, byte [str.___]
shl eax, 8
or eax, ecx
cmp dword [edi], eax
je 0x40338c
dec edi
cmp edi, ebp
jae 0x403383
cmp edi, ebp
mov dword [esp + 0x10], str.Error_launching_installer
jb 0x4033fd
mov byte [edi], bl
add edi, 4
push edi
call fcn.00405859
test eax, eax
je 0x4033d1
push edi
push 0x429400
call fcn.00405cf9
push edi
push 0x429800
call fcn.00405cf9
mov dword [esp + 0x10], ebx
or dword [0x4237ac], 0xffffffff
call fcn.00403679
mov dword [esp + 0x18], eax
call fcn.0040359f
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [esp + 0x10], ebx
pop ebp
je 0x403505
push 0x200010
push dword [esp + 0x10]
call fcn.004054ef
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.00405472
push str.nsu
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatA
cmp edi, ebx
je 0x40341e
push 0x40914c
push esi
call sub.KERNEL32.dll_lstrcatA
push str..tmp
push esi
call sub.KERNEL32.dll_lstrcatA
mov ebp, 0x429c00
push ebp
push esi
call dword [sym.imp.KERNEL32.dll_lstrcmpiA]
test eax, eax
je 0x4033d1
cmp edi, ebx
push esi
je 0x403446
call fcn.004053d8
jmp 0x40344b
call fcn.00405455
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
cmp byte [0x429400], bl
jne 0x403465
push ebp
push 0x429400
call fcn.00405cf9
push dword [esp + 0x1c]
push section..ndata
call fcn.00405cf9
movsx cx, byte [0x409140]
xor eax, eax
push 0x1a
mov ah, byte [0x409141]
pop ebp
or eax, ecx
mov edi, 0x41e8c8
mov word [0x424400], ax
mov eax, dword [0x423710]
push dword [eax + 0x120]
push edi
call fcn.00405d1b
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
cmp dword [esp + 0x10], ebx
je 0x4034f0
push 1
push edi
push 0x42ac00
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x4034f0
push ebx
push edi
call fcn.00405bb4
mov eax, dword [0x423710]
push dword [eax + 0x124]
push edi
call fcn.00405d1b
push edi
call fcn.0040548a
cmp eax, ebx
je 0x4034f0
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esp + 0x10], ebx
inc byte [0x424400]
dec ebp
jne 0x403493
push ebx
push esi
call fcn.00405bb4
jmp 0x4033d1
cmp dword [0x423794], ebx
je 0x403587
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
test eax, eax
pop edi
je 0x403558
lea eax, [esp + 0x24]
push eax
push str.SeShutdownPrivilege
push ebx
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueA]
push ebx
push ebx
lea eax, [esp + 0x28]
push ebx
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.00406092
cmp eax, ebx
mov esi, 0x80040002
je 0x403574
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x403580
push esi
push edi
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403587
push 9
call fcn.0040140b
mov eax, dword [0x4237ac]
cmp eax, 0xffffffff
je 0x403595
mov dword [esp + 0x14], eax
push dword [esp + 0x14]
call dword [sym.imp.KERNEL32.dll_ExitProcess]