Function at 0x403946
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
cmp ax, 6
mov dword [0x4378cc], eax
je 0x403996
push ebx
call fcn.00407007
cmp eax, ebx
je 0x403996
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00406f97
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], 0
jne 0x40399b
push 0xb
call fcn.00407007
push 9
call fcn.00407007
push 7
mov dword [0x4378c4], eax
call fcn.00407007
cmp eax, ebx
je 0x4039de
push 0x1e
call eax
test eax, eax
je 0x4039de
or byte [0x4378cf], 0x40
push ebp
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x437998], eax
push ebx
lea eax, [esp + 0x34]
push 0x2b4
push eax
push ebx
push 0x42c3c0
call dword [sym.imp.SHELL32.dll_SHGetFileInfoW]
push str.NSIS_Error
push 0x4368c0
call fcn.004069c4
call dword [sym.imp.KERNEL32.dll_GetCommandLineW]
mov ebp, 0x442000
push eax
push ebp
call fcn.004069c4
cmp word [0x442000], 0x22
mov dword [0x4378c0], 0x400000
mov eax, ebp
jne 0x403a47
push 0x22
mov eax, 0x442002
pop edi
push edi
push eax
call fcn.004062c6
push eax
call dword [sym.imp.USER32.dll_CharNextW]
mov ecx, eax
mov dword [esp + 0x18], ecx
mov ax, word [ecx]
cmp ax, bx
je 0x403b78
push 0x20
pop ebx
cmp ax, bx
jne 0x403a76
inc ecx
inc ecx
cmp word [ecx], bx
je 0x403a6f
cmp word [ecx], 0x22
jne 0x403a81
inc ecx
push 0x22
inc ecx
pop ebx
cmp word [ecx], 0x2f
jne 0x403b44
inc ecx
inc ecx
cmp word [ecx], 0x53
jne 0x403aac
mov ax, word [ecx + 2]
cmp ax, 0x20
je 0x403aa2
test ax, ax
jne 0x403aac
mov dword [0x437980], 1
movzx eax, word [0x40afc2]
cdq
shld edx, eax, 0x10
shl eax, 0x10
mov edi, eax
xor esi, esi
movzx eax, word [0x40afc0]
cdq
movzx edx, word [str.NCRC]
or edi, eax
movzx eax, word [0x40afbe]
shl eax, 0x10
or eax, edx
cdq
or esi, eax
mov eax, dword [ecx]
or edi, edx
cmp eax, esi
jne 0x403b02
mov eax, dword [ecx + 4]
cmp eax, edi
jne 0x403b02
mov ax, word [ecx + 8]
cmp ax, 0x20
je 0x403afd
test ax, ax
jne 0x403b02
or dword [esp + 0x1c], 4
movzx eax, word [0x40afb6]
cdq
shld edx, eax, 0x10
shl eax, 0x10
mov edi, eax
xor esi, esi
movzx eax, word [0x40afb4]
cdq
movzx edx, word [str.__D]
or edi, eax
movzx eax, word [0x40afb2]
shl eax, 0x10
or eax, edx
cdq
or esi, eax
mov eax, dword [ecx - 4]
or edi, edx
cmp eax, esi
jne 0x403b44
mov eax, dword [ecx]
cmp eax, edi
je 0x403b63
push ebx
push ecx
call fcn.004062c6
mov ecx, eax
cmp word [ecx], 0x22
jne 0x403b55
inc ecx
inc ecx
mov ax, word [ecx]
test ax, ax
jne 0x403a67
jmp 0x403b76
and word [ecx - 4], 0
add ecx, 4
push ecx
push 0x442800
call fcn.004069c4
xor ebx, ebx
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathW]
mov esi, 0x444800
push esi
push 0x400
call edi
call fcn.00403915
test eax, eax
jne 0x403bea
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryW]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatW
call fcn.00403915
test eax, eax
jne 0x403bea
push esi
push 0x3fc
call edi
push 0x40af9c
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 0x40af88
call edi
call fcn.00403915
test eax, eax
je 0x403cbc
push 0x444000
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
push dword [esp + 0x1c]
call fcn.00403496
cmp eax, ebx
mov dword [esp + 0x10], eax
jne 0x403cbc
cmp dword [0x4378e0], ebx
je 0x403ca5
push ebx
push ebp
call fcn.004062c6
mov edi, eax
cmp edi, ebp
jb 0x403c6f
movzx eax, word [0x40af82]
cdq
shld edx, eax, 0x10
shl eax, 0x10
mov ebx, eax
movzx eax, word [0x40af80]
movzx ecx, word [str.___]
cdq
or ebx, eax
movzx eax, word [0x40af7e]
shl eax, 0x10
or eax, ecx
xor ecx, ecx
cdq
or ecx, eax
mov eax, ebx
or eax, edx
mov edx, dword [edi]
cmp edx, ecx
jne 0x403c67
mov edx, dword [edi + 4]
cmp edx, eax
je 0x403c6d
dec edi
dec edi
cmp edi, ebp
jae 0x403c5a
xor ebx, ebx
cmp edi, ebp
mov dword [esp + 0x10], str.Error_launching_installer
jb 0x403ce8
mov word [edi], bx
add edi, 8
push edi
call fcn.004063a1
test eax, eax
je 0x403cbc
push edi
push 0x442800
call fcn.004069c4
push edi
push 0x443000
call fcn.004069c4
mov dword [esp + 0x10], ebx
or dword [0x43798c], 0xffffffff
call fcn.00403f89
push 1
mov dword [esp + 0x18], eax
call fcn.00406d22
call fcn.00403e8e
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [esp + 0x10], ebx
pop ebp
je 0x403df2
push 0x200010
push dword [esp + 0x10]
call fcn.00405fd1
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.00405f3c
push 0x40af70
push esi
mov edi, eax
call sub.KERNEL32.dll_lstrcatW
cmp edi, ebx
je 0x403d09
push 0x40af6c
push esi
call sub.KERNEL32.dll_lstrcatW
push str..tmp
push esi
call sub.KERNEL32.dll_lstrcatW
mov ebp, 0x443800
push ebp
push esi
call dword [sym.imp.KERNEL32.dll_lstrcmpiW]
test eax, eax
je 0x403cbc
cmp edi, ebx
push esi
je 0x403d31
call fcn.00405ea2
jmp 0x403d36
call fcn.00405f1f
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryW]
cmp word [0x442800], bx
jne 0x403d51
push ebp
push 0x442800
call fcn.004069c4
push dword [esp + 0x18]
push section..ndata
call fcn.004069c4
movzx eax, word [0x40af5a]
movzx ecx, word [0x40af58]
shl eax, 0x10
or eax, ecx
push 0x1a
mov dword [0x438800], eax
pop ebp
mov edi, 0x42bbc0
mov eax, dword [0x4378d4]
push dword [eax + 0x120]
push edi
call fcn.00406a01
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
cmp dword [esp + 0x10], ebx
je 0x403ddc
push 1
push edi
push 0x445800
call dword [sym.imp.KERNEL32.dll_CopyFileW]
test eax, eax
je 0x403ddc
push ebx
push edi
call fcn.0040678a
mov eax, dword [0x4378d4]
push dword [eax + 0x124]
push edi
call fcn.00406a01
push edi
call fcn.00405f54
cmp eax, ebx
je 0x403ddc
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esp + 0x10], ebx
inc word [0x438800]
dec ebp
jne 0x403d7f
push ebx
push esi
call fcn.0040678a
jmp 0x403cbc
cmp dword [0x437974], ebx
je 0x403e76
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 0x403e46
lea eax, [esp + 0x20]
push eax
push str.SeShutdownPrivilege
push ebx
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueW]
push ebx
push ebx
lea eax, [esp + 0x24]
push ebx
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.00407007
cmp eax, ebx
mov esi, 0x80040002
je 0x403e62
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x403e6f
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403e76
push 9
call fcn.0040140b
mov eax, dword [0x43798c]
cmp eax, 0xffffffff
je 0x403e84
mov dword [esp + 0x10], eax
push dword [esp + 0x10]
call dword [sym.imp.KERNEL32.dll_ExitProcess]