Function at 0x403836
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:
push ebp
mov ebp, esp
sub esp, 0x224
push esi
push edi
xor edi, edi
push 0x8001
mov dword [ebp - 0x14], edi
mov dword [ebp - 0xc], str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
mov dword [ebp - 8], edi
mov byte [ebp - 4], 0x20
call dword [sym.imp.KERNEL32.dll_SetErrorMode]
mov esi, dword [sym.imp.KERNEL32.dll_GetVersionExA]
lea eax, [ebp - 0xc4]
push eax
mov dword [ebp - 0xb0], edi
mov dword [ebp - 0x30], edi
mov dword [ebp - 0x2c], edi
mov dword [ebp - 0xc4], 0x9c
call esi
test eax, eax
jne 0x4038c7
lea eax, [ebp - 0xc4]
mov dword [ebp - 0xc4], 0x94
push eax
call esi
cmp dword [ebp - 0xb4], 2
jne 0x4038ce
movsx cx, byte [ebp - 0xa3]
mov al, byte [ebp - 0xb0]
sub ecx, 0x30
sub al, 0x53
mov byte [ebp - 0x2a], 4
neg al
sbb eax, eax
not eax
and eax, ecx
mov word [ebp - 0x30], ax
cmp dword [ebp - 0xb4], 2
jae 0x4038f2
and byte [ebp - 0x2a], 0
cmp byte [ebp - 0xaf], 0x41
jl 0x4038ee
movsx ax, byte [ebp - 0xaf]
sub eax, 0x40
mov word [ebp - 0x30], ax
jmp 0x4038f2
mov word [ebp - 0x30], di
cmp dword [ebp - 0xc0], 0xa
jae 0x403903
and word [ebp - 0xb6], 0
mov eax, dword [ebp - 0xb8]
movzx ecx, byte [ebp - 0xbc]
mov dword [0x425478], eax
xor eax, eax
mov ah, byte [ebp - 0xc0]
movzx eax, ax
or eax, ecx
xor ecx, ecx
mov ch, byte [ebp - 0x30]
movzx ecx, cx
shl eax, 0x10
or eax, ecx
movzx ecx, byte [ebp - 0x2a]
or eax, ecx
mov dword [0x42547c], eax
cmp word [0x42547e], 0x600
je 0x403956
push edi
call fcn.00406b73
cmp eax, edi
je 0x403956
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00406b05
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], 0
jne 0x40395b
push 0xd
call fcn.00406b73
push 0xb
call fcn.00406b73
push 9
mov dword [0x4253a4], eax
call fcn.00406b73
cmp eax, edi
je 0x40399e
push 0x1e
call eax
test eax, eax
je 0x40399e
or byte [0x42547c], 0x80
push ebx
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push edi
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x425480], eax
push edi
lea eax, [ebp - 0x224]
push 0x160
push eax
push edi
push 0x4208fc
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x424ba0
call fcn.0040674b
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
mov ebx, 0x42b000
push eax
push ebx
call fcn.0040674b
cmp byte [0x42b000], 0x22
mov dword [0x4253a0], 0x400000
mov eax, ebx
jne 0x403a09
mov byte [ebp - 4], 0x22
mov eax, 0x42b001
push dword [ebp - 4]
push eax
call fcn.004060cb
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [ebp - 0x10], eax
jmp 0x403add
cmp cl, 0x20
jne 0x403a2c
inc eax
cmp byte [eax], 0x20
je 0x403a26
cmp byte [eax], 0x22
mov byte [ebp - 4], 0x20
jne 0x403a3a
inc eax
mov byte [ebp - 4], 0x22
cmp byte [eax], 0x2f
jne 0x403ace
inc eax
cmp byte [eax], 0x53
jne 0x403a5f
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x403a55
test cl, cl
jne 0x403a5f
mov dword [0x425460], 1
movsx ecx, byte [0x40b187]
movsx edx, byte [0x40b186]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x40b185]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.NCRC]
shl ecx, 8
or ecx, edx
cmp dword [eax], ecx
jne 0x403a9e
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x403a9a
test cl, cl
jne 0x403a9e
or dword [ebp - 8], 4
movsx ecx, byte [0x40b17f]
movsx edx, byte [0x40b17e]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x40b17d]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.__D]
shl ecx, 8
or ecx, edx
cmp dword [eax - 2], ecx
je 0x403ae9
push dword [ebp - 4]
push eax
call fcn.004060cb
cmp byte [eax], 0x22
jne 0x403add
inc eax
mov cl, byte [eax]
test cl, cl
jne 0x403a21
jmp 0x403afb
and byte [eax - 2], 0
add eax, 2
push eax
push 0x42b400
call fcn.0040674b
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
mov esi, 0x42c400
push esi
push 0x400
call edi
call fcn.00403805
test eax, eax
jne 0x403b6d
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatA
call fcn.00403805
test eax, eax
jne 0x403b6d
push esi
push 0x3fc
call edi
push 0x40b170
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 0x40b164
call edi
call fcn.00403805
test eax, eax
je 0x403c18
push 0x42c000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push dword [ebp - 8]
call fcn.00403067
test eax, eax
mov dword [ebp - 0xc], eax
jne 0x403c18
cmp dword [0x4253c4], eax
je 0x403c09
push eax
push ebx
call fcn.004060cb
mov edi, eax
cmp edi, ebx
jb 0x403bd4
movsx eax, byte [0x40b15f]
movsx ecx, byte [0x40b15e]
shl eax, 8
or eax, ecx
movsx ecx, byte [0x40b15d]
shl eax, 8
or eax, ecx
movsx ecx, byte [str.___]
shl eax, 8
or eax, ecx
cmp dword [edi], eax
je 0x403bd4
dec edi
cmp edi, ebx
jae 0x403bcb
cmp edi, ebx
mov dword [ebp - 0xc], str.Error_launching_installer
jb 0x403c44
and byte [edi], 0
add edi, 4
push edi
call fcn.004061cb
test eax, eax
je 0x403c18
push edi
push 0x42b400
call fcn.0040674b
push edi
push 0x42b800
call fcn.0040674b
and dword [ebp - 0xc], 0
or dword [0x42546c], 0xffffffff
call fcn.00403ef4
mov dword [ebp - 0x14], eax
call fcn.00403e1a
call dword [sym.imp.ole32.dll_OleUninitialize]
xor edi, edi
pop ebx
cmp dword [ebp - 0xc], edi
je 0x403d86
push 0x200010
push dword [ebp - 0xc]
call fcn.00405e24
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.00405d8f
push esi
mov dword [ebp - 0x18], eax
call sub.KERNEL32.dll_lstrlenA
push dword [ebp - 0x10]
mov edi, eax
push section..ndata
call fcn.0040674b
cmp byte [0x42b400], 0
jne 0x403c79
push 0x42bc00
push 0x42b400
call fcn.0040674b
lea eax, [edi + 0x42c400]
mov dword [ebp - 8], 1
mov dword [ebp - 0x10], eax
mov edi, 0x427400
mov ebx, 0x427800
and dword [ebp - 4], 0
movzx eax, word [ebp - 8]
push eax
push str.nsu_X.tmp
push dword [ebp - 0x10]
call dword [sym.imp.USER32.dll_wsprintfA]
mov eax, dword [0x4253b4]
add esp, 0xc
push dword [eax + 0x120]
push edi
call fcn.004067de
cmp dword [ebp - 0x18], 0
push esi
je 0x403ccc
call fcn.00405d18
jmp 0x403cd1
call fcn.00405d72
test eax, eax
je 0x403d0d
push edi
call dword [sym.imp.KERNEL32.dll_GetFileAttributesA]
test ah, 4
jne 0x403cfe
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
test eax, eax
je 0x403cfe
push 1
push esi
call fcn.00405ed0
mov eax, dword [ebp - 4]
inc dword [ebp - 4]
test eax, eax
je 0x403c97
inc dword [ebp - 8]
cmp word [ebp - 8], 0
jne 0x403c93
jmp 0x403c18
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
push 0
push esi
call fcn.00406524
push 1
push edi
push 0x42cc00
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x403c18
push 0
push edi
call fcn.00406524
mov eax, dword [0x4253b4]
push dword [eax + 0x124]
push ebx
call fcn.004067de
push ebx
call fcn.00405da7
test eax, eax
jne 0x403d76
mov eax, dword [ebp - 4]
inc dword [ebp - 4]
test eax, eax
jne 0x403c18
push edi
call fcn.00406ade
test eax, eax
je 0x403c97
jmp 0x403c18
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
and dword [ebp - 0xc], 0
jmp 0x403c18
cmp dword [0x425454], edi
je 0x403e04
lea eax, [ebp - 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 0x403dd4
lea eax, [ebp - 0x24]
push eax
push str.SeShutdownPrivilege
push edi
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueA]
push edi
push edi
lea eax, [ebp - 0x28]
push edi
push eax
push edi
push dword [ebp - 0x18]
mov dword [ebp - 0x28], 1
mov dword [ebp - 0x1c], 2
call dword [sym.imp.ADVAPI32.dll_AdjustTokenPrivileges]
push 5
call fcn.00406b73
cmp eax, edi
mov esi, 0x80040002
je 0x403df0
push esi
push 0x25
push edi
push edi
push edi
call eax
test eax, eax
je 0x403dfd
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403e04
push 9
call fcn.0040140a
mov eax, dword [0x42546c]
cmp eax, 0xffffffff
je 0x403e11
mov dword [ebp - 0x14], eax
push dword [ebp - 0x14]
call dword [sym.imp.KERNEL32.dll_ExitProcess]