Function at 0x40395d
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, 0x2d4
push ebx
push esi
push edi
push 0x20
pop edi
xor ebx, ebx
push 0x8001
mov dword [esp + 0x14], ebx
mov dword [esp + 0x10], str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
mov dword [esp + 0x1c], ebx
call dword [sym.imp.KERNEL32.dll_SetErrorMode]
call dword [sym.imp.KERNEL32.dll_GetVersion]
and eax, 0xbfffffff
mov dword [0x439d20], eax
cmp ax, 6
je 0x4039ad
push ebx
call fcn.0040649f
cmp eax, ebx
je 0x4039ad
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.0040642f
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], bl
jne 0x4039b2
push 0xa
call fcn.0040649f
push 8
call fcn.0040649f
push 6
mov dword [0x439d24], eax
call fcn.0040649f
cmp eax, ebx
je 0x4039f7
push 0x1e
call eax
test eax, eax
je 0x4039f7
or dword [0x439d20], 0x40000000
push ebp
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
push ebx
push 0x2b4
mov dword [0x439e38], eax
lea eax, [esp + 0x38]
push eax
push ebx
push 0x4085c0
call dword [sym.imp.SHELL32.dll_SHGetFileInfoW]
push str.NSIS_Error
push 0x438d20
call fcn.00406335
call dword [sym.imp.KERNEL32.dll_GetCommandLineW]
push eax
mov ebp, 0x444000
push ebp
call fcn.00406335
push 0x22
pop esi
mov dword [0x439d2c], 0x400000
mov eax, ebp
cmp word [0x444000], si
jne 0x403a61
mov edi, esi
mov eax, 0x444002
push edi
push eax
call fcn.00405e77
push eax
call dword [sym.imp.USER32.dll_CharNextW]
mov dword [esp + 0x18], eax
jmp 0x403afb
push 0x20
pop edi
cmp cx, di
jne 0x403a87
inc eax
inc eax
cmp word [eax], di
je 0x403a80
mov edx, edi
cmp word [eax], si
jne 0x403a92
inc eax
inc eax
mov edx, esi
cmp word [eax], 0x2f
jne 0x403aed
inc eax
inc eax
cmp word [eax], 0x53
jne 0x403ab8
movzx ecx, word [eax + 2]
cmp cx, di
je 0x403aae
cmp cx, bx
jne 0x403ab8
mov dword [0x439e20], 1
cmp dword [eax], 0x43004e
jne 0x403adc
cmp dword [eax + 4], 0x430052
jne 0x403adc
movzx ecx, word [eax + 8]
cmp cx, di
je 0x403ad7
cmp cx, bx
jne 0x403adc
or dword [esp + 0x1c], 4
cmp dword [eax - 4], 0x2f0020
jne 0x403aed
cmp dword [eax], 0x3d0044
je 0x403b09
push edx
push eax
call fcn.00405e77
cmp word [eax], si
jne 0x403afb
inc eax
inc eax
movzx ecx, word [eax]
cmp cx, bx
jne 0x403a78
jmp 0x403b1d
xor ecx, ecx
mov word [eax - 4], cx
add eax, 4
push eax
push 0x444800
call fcn.00406335
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathW]
mov esi, 0x446800
push esi
push 0x400
call edi
call fcn.00403902
test eax, eax
jne 0x403b8f
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryW]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatW
call fcn.00403902
test eax, eax
jne 0x403b8f
push esi
push 0x3fc
call edi
push 0x408594
push esi
call sub.KERNEL32.dll_lstrcatW
mov edi, dword [sym.imp.KERNEL32.dll_SetEnvironmentVariableW]
push esi
push str.TEMP
call edi
push esi
push 0x408580
call edi
call fcn.00403902
test eax, eax
je 0x403c22
mov ebx, dword [sym.imp.KERNEL32.dll_DeleteFileW]
push 0x446000
call ebx
push dword [esp + 0x1c]
call fcn.004034f5
mov dword [esp + 0x10], eax
test eax, eax
jne 0x403c20
cmp dword [0x439d98], eax
je 0x403c10
push eax
push ebp
call fcn.00405e77
mov edi, eax
jmp 0x403bd3
cmp dword [edi], 0x5f0020
jne 0x403bd1
cmp dword [edi + 4], 0x3d003f
je 0x403bd7
dec edi
dec edi
cmp edi, ebp
jae 0x403bc0
mov dword [esp + 0x10], str.Error_launching_installer
cmp edi, ebp
jb 0x403c4e
xor eax, eax
mov word [edi], ax
add edi, 8
push edi
call fcn.00406693
test eax, eax
je 0x403c20
push edi
push 0x444800
call fcn.00406335
push edi
push 0x445000
call fcn.00406335
and dword [esp + 0x10], 0
or dword [0x439e2c], 0xffffffff
call fcn.00405a1c
mov dword [esp + 0x14], eax
xor ebx, ebx
call fcn.00403933
call dword [sym.imp.ole32.dll_OleUninitialize]
pop ebp
cmp dword [esp + 0xc], ebx
je 0x403d4a
push 0x200010
push dword [esp + 0x10]
call fcn.00405e11
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.00406590
push 0x408574
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatW
test edi, edi
je 0x403c6f
push 0x408570
push esi
call sub.KERNEL32.dll_lstrcatW
push str..tmp
push esi
call sub.KERNEL32.dll_lstrcatW
mov ebp, 0x445800
push ebp
push esi
call dword [sym.imp.KERNEL32.dll_lstrcmpiW]
test eax, eax
je 0x403c20
push esi
test edi, edi
je 0x403c97
call fcn.00405cf5
jmp 0x403c9c
call fcn.00405d77
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryW]
cmp word [0x444800], 0
jne 0x403cb8
push ebp
push 0x444800
call fcn.00406335
push dword [esp + 0x18]
push section..ndata
call fcn.00406335
push 0x1a
mov dword [0x43a800], 0x41
pop ebp
mov edi, 0x4309d0
mov eax, dword [0x439d30]
push dword [eax + 0x120]
push edi
call fcn.0040671b
push edi
call ebx
cmp dword [esp + 0x10], 0
je 0x403d34
push 1
push edi
push 0x447800
call dword [sym.imp.KERNEL32.dll_CopyFileW]
test eax, eax
je 0x403d34
push 0
push edi
call fcn.00406b0a
mov eax, dword [0x439d30]
push dword [eax + 0x124]
push edi
call fcn.0040671b
push edi
call fcn.00405d94
test eax, eax
je 0x403d34
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
and dword [esp + 0x10], 0
inc word [0x43a800]
dec ebp
jne 0x403cd8
push ebp
push esi
call fcn.00406b0a
jmp 0x403c20
cmp dword [0x439e14], ebx
je 0x403dce
lea eax, [esp + 0x14]
push eax
push 0x28
call dword [sym.imp.KERNEL32.dll_GetCurrentProcess]
push eax
call dword [sym.imp.ADVAPI32.dll_OpenProcessToken]
test eax, eax
je 0x403d9e
lea eax, [esp + 0x20]
push eax
push str.SeShutdownPrivilege
push ebx
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueW]
push ebx
push ebx
push ebx
lea eax, [esp + 0x28]
push eax
push ebx
push dword [esp + 0x28]
mov dword [esp + 0x34], 1
mov dword [esp + 0x40], 2
call dword [sym.imp.ADVAPI32.dll_AdjustTokenPrivileges]
push 4
call fcn.0040649f
mov esi, 0x80040002
cmp eax, ebx
je 0x403dba
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x403dc7
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403dce
push 9
call fcn.0040141a
mov eax, dword [0x439e2c]
cmp eax, 0xffffffff
je 0x403ddc
mov dword [esp + 0x10], eax
push dword [esp + 0x10]
jmp 0x403c48