Function at 0x4036a4
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]
and eax, 0xbfffffff
cmp ax, 6
mov dword [0x43092c], eax
je 0x4036f6
push ebx
call fcn.00406b47
cmp eax, ebx
je 0x4036f6
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00406ad9
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], bl
jne 0x4036fb
push 0xa
call fcn.00406b47
push 8
call fcn.00406b47
push 6
mov dword [0x430924], eax
call fcn.00406b47
cmp eax, ebx
je 0x40373d
push 0x1e
call eax
test eax, eax
je 0x40373d
or byte [0x43092f], 0x40
push ebp
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x4309f8], eax
push ebx
lea eax, [esp + 0x38]
push 0x160
push eax
push ebx
push 0x42a148
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x430120
call fcn.00406565
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
mov ebp, 0x436000
push eax
push ebp
call fcn.00406565
cmp byte [0x436000], 0x22
mov dword [0x430920], 0x400000
mov eax, ebp
jne 0x4037a7
mov byte [esp + 0x14], 0x22
mov eax, 0x436001
push dword [esp + 0x14]
push eax
call fcn.00405f28
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [esp + 0x1c], eax
jmp 0x403881
cmp cl, 0x20
jne 0x4037cc
inc eax
cmp byte [eax], 0x20
je 0x4037c6
cmp byte [eax], 0x22
mov byte [esp + 0x14], 0x20
jne 0x4037dc
inc eax
mov byte [esp + 0x14], 0x22
cmp byte [eax], 0x2f
jne 0x403871
inc eax
cmp byte [eax], 0x53
jne 0x403801
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x4037f7
cmp cl, bl
jne 0x403801
mov dword [0x4309e0], 1
movsx ecx, byte [0x40a83b]
movsx edx, byte [0x40a83a]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x40a839]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.NCRC]
shl ecx, 8
or ecx, edx
cmp dword [eax], ecx
jne 0x403841
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x40383c
cmp cl, bl
jne 0x403841
or dword [esp + 0x20], 4
movsx ecx, byte [0x40a833]
movsx edx, byte [0x40a832]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x40a831]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.__D]
shl ecx, 8
or ecx, edx
cmp dword [eax - 2], ecx
je 0x40388d
push dword [esp + 0x14]
push eax
call fcn.00405f28
cmp byte [eax], 0x22
jne 0x403881
inc eax
mov cl, byte [eax]
cmp cl, bl
jne 0x4037c1
jmp 0x40389e
mov byte [eax - 2], bl
add eax, 2
push eax
push 0x436400
call fcn.00406565
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
mov esi, 0x437400
push esi
push 0x400
call edi
call fcn.00403673
test eax, eax
jne 0x403910
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatA
call fcn.00403673
test eax, eax
jne 0x403910
push esi
push 0x3fc
call edi
push 0x40a824
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 0x40a818
call edi
call fcn.00403673
test eax, eax
je 0x4039c5
push 0x437000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push dword [esp + 0x20]
call fcn.004031fb
cmp eax, ebx
mov dword [esp + 0x10], eax
jne 0x4039c5
cmp dword [0x430940], ebx
je 0x4039ae
push ebx
push ebp
call fcn.00405f28
mov edi, eax
cmp edi, ebp
jb 0x403979
movsx eax, byte [0x40a813]
movsx ecx, byte [0x40a812]
shl eax, 8
or eax, ecx
movsx ecx, byte [0x40a811]
shl eax, 8
or eax, ecx
movsx ecx, byte [0x40a810]
shl eax, 8
or eax, ecx
cmp dword [edi], eax
je 0x403979
dec edi
cmp edi, ebp
jae 0x403970
cmp edi, ebp
mov dword [esp + 0x10], str.Error_launching_installer
jb 0x4039f1
mov byte [edi], bl
add edi, 4
push edi
call fcn.00405feb
test eax, eax
je 0x4039c5
push edi
push 0x436400
call fcn.00406565
push edi
push 0x436800
call fcn.00406565
mov dword [esp + 0x10], ebx
or dword [0x4309ec], 0xffffffff
call fcn.00403c8e
push 1
mov dword [esp + 0x1c], eax
call fcn.00406868
call fcn.00403b93
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [esp + 0x10], ebx
pop ebp
je 0x403af9
push 0x200010
push dword [esp + 0x10]
call fcn.00405c2c
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.00405b97
push str.nsu
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatA
cmp edi, ebx
je 0x403a12
push 0x40a804
push esi
call sub.KERNEL32.dll_lstrcatA
push str..tmp
push esi
call sub.KERNEL32.dll_lstrcatA
mov ebp, 0x436c00
push ebp
push esi
call dword [sym.imp.KERNEL32.dll_lstrcmpiA]
test eax, eax
je 0x4039c5
cmp edi, ebx
push esi
je 0x403a3a
call fcn.00405afd
jmp 0x403a3f
call fcn.00405b7a
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
cmp byte [0x436400], bl
jne 0x403a59
push ebp
push 0x436400
call fcn.00406565
push dword [esp + 0x1c]
push section..ndata
call fcn.00406565
movsx cx, byte [0x40a7f8]
xor eax, eax
push 0x1a
mov ah, byte [0x40a7f9]
pop ebp
or eax, ecx
mov edi, 0x429d48
mov word [0x431400], ax
mov eax, dword [0x430934]
push dword [eax + 0x120]
push edi
call fcn.00406587
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
cmp dword [esp + 0x10], ebx
je 0x403ae4
push 1
push edi
push 0x437c00
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x403ae4
push ebx
push edi
call fcn.00406344
mov eax, dword [0x430934]
push dword [eax + 0x124]
push edi
call fcn.00406587
push edi
call fcn.00405baf
cmp eax, ebx
je 0x403ae4
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esp + 0x10], ebx
inc byte [0x431400]
dec ebp
jne 0x403a87
push ebx
push esi
call fcn.00406344
jmp 0x4039c5
cmp dword [0x4309d4], ebx
je 0x403b7b
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 0x403b4c
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.00406b47
cmp eax, ebx
mov esi, 0x80040002
je 0x403b68
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x403b74
push esi
push edi
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403b7b
push 9
call fcn.0040140b
mov eax, dword [0x4309ec]
cmp eax, 0xffffffff
je 0x403b89
mov dword [esp + 0x14], eax
push dword [esp + 0x14]
call dword [sym.imp.KERNEL32.dll_ExitProcess]