Function at 0x403811
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 [0x4378ac], eax
je 0x403861
push ebx
call fcn.00406e96
cmp eax, ebx
je 0x403861
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00406e26
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], 0
jne 0x403866
push 0xa
call fcn.00406e96
push 8
call fcn.00406e96
push 6
mov dword [0x4378a4], eax
call fcn.00406e96
cmp eax, ebx
je 0x4038a9
push 0x1e
call eax
test eax, eax
je 0x4038a9
or byte [0x4378af], 0x40
push ebp
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x437978], eax
push ebx
lea eax, [esp + 0x34]
push 0x2b4
push eax
push ebx
push 0x42c3a0
call dword [sym.imp.SHELL32.dll_SHGetFileInfoW]
push str.NSIS_Error
push 0x4368a0
call fcn.0040686e
call dword [sym.imp.KERNEL32.dll_GetCommandLineW]
mov ebp, 0x442000
push eax
push ebp
call fcn.0040686e
cmp word [0x442000], 0x22
mov dword [0x4378a0], 0x400000
mov eax, ebp
jne 0x403912
push 0x22
mov eax, 0x442002
pop edi
push edi
push eax
call fcn.00406170
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 0x403a43
push 0x20
pop ebx
cmp ax, bx
jne 0x403941
inc ecx
inc ecx
cmp word [ecx], bx
je 0x40393a
cmp word [ecx], 0x22
jne 0x40394c
inc ecx
push 0x22
inc ecx
pop ebx
cmp word [ecx], 0x2f
jne 0x403a0f
inc ecx
inc ecx
cmp word [ecx], 0x53
jne 0x403977
mov ax, word [ecx + 2]
cmp ax, 0x20
je 0x40396d
test ax, ax
jne 0x403977
mov dword [0x437960], 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 0x4039cd
mov eax, dword [ecx + 4]
cmp eax, edi
jne 0x4039cd
mov ax, word [ecx + 8]
cmp ax, 0x20
je 0x4039c8
test ax, ax
jne 0x4039cd
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 0x403a0f
mov eax, dword [ecx]
cmp eax, edi
je 0x403a2e
push ebx
push ecx
call fcn.00406170
mov ecx, eax
cmp word [ecx], 0x22
jne 0x403a20
inc ecx
inc ecx
mov ax, word [ecx]
test ax, ax
jne 0x403932
jmp 0x403a41
and word [ecx - 4], 0
add ecx, 4
push ecx
push 0x442800
call fcn.0040686e
xor ebx, ebx
mov esi, dword [sym.imp.KERNEL32.dll_GetTempPathW]
mov edi, 0x444800
push edi
push 0x400
call esi
call fcn.004037e0
test eax, eax
jne 0x403ab5
push 0x3fb
push edi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryW]
push str.Temp
push edi
call sub.KERNEL32.dll_lstrcatW
call fcn.004037e0
test eax, eax
jne 0x403ab5
push edi
push 0x3fc
call esi
push 0x40af9c
push edi
call sub.KERNEL32.dll_lstrcatW
mov esi, dword [sym.imp.KERNEL32.dll_SetEnvironmentVariableW]
push edi
push str.TEMP
call esi
push edi
push 0x40af88
call esi
call fcn.004037e0
test eax, eax
je 0x403b87
push 0x444000
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
push dword [esp + 0x1c]
call fcn.0040335f
cmp eax, ebx
mov dword [esp + 0x10], eax
jne 0x403b87
cmp dword [0x4378c0], ebx
je 0x403b70
push ebx
push ebp
call fcn.00406170
mov esi, eax
cmp esi, ebp
jb 0x403b3a
movzx eax, word [0x40af82]
cdq
shld edx, eax, 0x10
shl eax, 0x10
mov ebx, eax
movzx eax, word [0x40af80]
movzx ecx, word [0x40af7c]
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 [esi]
cmp edx, ecx
jne 0x403b32
mov edx, dword [esi + 4]
cmp edx, eax
je 0x403b38
dec esi
dec esi
cmp esi, ebp
jae 0x403b25
xor ebx, ebx
cmp esi, ebp
mov dword [esp + 0x10], str.Error_launching_installer
jb 0x403bb3
mov word [esi], bx
add esi, 8
push esi
call fcn.0040624b
test eax, eax
je 0x403b87
push esi
push 0x442800
call fcn.0040686e
push esi
push 0x443000
call fcn.0040686e
mov dword [esp + 0x10], ebx
or dword [0x43796c], 0xffffffff
call fcn.00403e54
push 1
mov dword [esp + 0x18], eax
call fcn.00406bb1
call fcn.00403d59
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [esp + 0x10], ebx
pop ebp
je 0x403cbd
push 0x200010
push dword [esp + 0x10]
call fcn.00405e7b
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.00405de6
push 0x40af70
push edi
mov esi, eax
call sub.KERNEL32.dll_lstrcatW
cmp esi, ebx
je 0x403bd4
push 0x40af6c
push edi
call sub.KERNEL32.dll_lstrcatW
push str..tmp
push edi
call sub.KERNEL32.dll_lstrcatW
mov ebp, 0x443800
push ebp
push edi
call dword [sym.imp.KERNEL32.dll_lstrcmpiW]
test eax, eax
je 0x403b87
cmp esi, ebx
push edi
je 0x403bfc
call fcn.00405d4c
jmp 0x403c01
call fcn.00405dc9
push edi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryW]
cmp word [0x442800], bx
jne 0x403c1c
push ebp
push 0x442800
call fcn.0040686e
push dword [esp + 0x18]
push section..ndata
call fcn.0040686e
movzx eax, word [0x40af5a]
movzx ecx, word [0x40af58]
shl eax, 0x10
or eax, ecx
push 0x1a
mov dword [0x438800], eax
pop ebp
mov esi, 0x42bba0
mov eax, dword [0x4378b4]
push dword [eax + 0x120]
push esi
call fcn.00406890
push esi
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
cmp dword [esp + 0x10], ebx
je 0x403ca7
push 1
push esi
push 0x445800
call dword [sym.imp.KERNEL32.dll_CopyFileW]
test eax, eax
je 0x403ca7
push ebx
push esi
call fcn.00406634
mov eax, dword [0x4378b4]
push dword [eax + 0x124]
push esi
call fcn.00406890
push esi
call fcn.00405dfe
cmp eax, ebx
je 0x403ca7
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esp + 0x10], ebx
inc word [0x438800]
dec ebp
jne 0x403c4a
push ebx
push edi
call fcn.00406634
jmp 0x403b87
cmp dword [0x437954], ebx
je 0x403d41
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 0x403d11
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.00406e96
cmp eax, ebx
mov esi, 0x80040002
je 0x403d2d
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x403d3a
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403d41
push 9
call fcn.0040140b
mov eax, dword [0x43796c]
cmp eax, 0xffffffff
je 0x403d4f
mov dword [esp + 0x10], eax
push dword [esp + 0x10]
call dword [sym.imp.KERNEL32.dll_ExitProcess]