Function at 0x403bbb
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:
sub esp, 0x3ec
push ebx
push ebp
push esi
push edi
xor ebx, ebx
mov edi, 0x409de4
push 0x8001
mov dword [esp + 0x14], ebx
mov ebp, ebx
call dword [sym.imp.KERNEL32.dll_SetErrorMode]
mov esi, dword [sym.imp.KERNEL32.dll_GetVersionExW]
lea eax, [esp + 0x2c]
xorps xmm0, xmm0
mov dword [esp + 0x40], ebx
push eax
movlpd qword [esp + 0x144], xmm0
mov dword [esp + 0x30], 0x11c
call esi
test eax, eax
jne 0x403c3d
lea eax, [esp + 0x2c]
mov dword [esp + 0x2c], 0x114
push eax
call esi
push 0x53
pop eax
mov dl, 4
mov byte [esp + 0x146], dl
cmp word [esp + 0x40], ax
jne 0x403c39
mov eax, dword [esp + 0x5a]
add eax, 0xffffffd0
mov word [esp + 0x140], ax
jmp 0x403c44
xor eax, eax
jmp 0x403c2f
mov dl, byte [esp + 0x146]
cmp dword [esp + 0x30], 0xa
jae 0x403c56
movzx eax, word [esp + 0x38]
mov dword [esp + 0x38], eax
jmp 0x403c5a
mov eax, dword [esp + 0x38]
mov dword [0x47a338], eax
movzx eax, byte [esp + 0x30]
shl ax, 8
movzx ecx, ax
movzx eax, byte [esp + 0x34]
or ecx, eax
movzx eax, byte [esp + 0x140]
shl ax, 8
shl ecx, 0x10
movzx eax, ax
or ecx, eax
movzx eax, dl
or ecx, eax
mov eax, 0x600
mov dword [0x47a33c], ecx
sar ecx, 0x10
cmp cx, ax
je 0x403caf
push ebx
call fcn.00407189
test eax, eax
je 0x403caf
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00406786
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
inc esi
add esi, eax
cmp byte [esi], bl
jne 0x403cb4
push 0xc
call fcn.00407189
push 0xa
call fcn.00407189
push 8
mov dword [0x472230], eax
call fcn.00407189
test eax, eax
je 0x403cf5
push 0x1e
call eax
test eax, eax
je 0x403cf5
or byte [0x47a33c], 0x80
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
push ebx
push 0x2b4
mov dword [0x47a2a0], eax
lea eax, [esp + 0x150]
push eax
push ebx
push 0x409e18
call dword [sym.imp.SHELL32.dll_SHGetFileInfoW]
push str.NSIS
push 0x472240
call fcn.004073bd
call dword [sym.imp.KERNEL32.dll_GetCommandLineW]
push eax
mov esi, 0x4cb000
push esi
call fcn.004073bd
movzx ecx, word [0x4cb000]
push 0x22
pop ebx
push 0x20
pop edx
cmp cx, bx
mov dword [0x472234], 0x400000
mov eax, ebx
mov dword [esp + 0x14], ebx
cmovne eax, edx
mov edx, 0x4cb002
movzx eax, ax
push eax
mov eax, esi
cmove eax, edx
push eax
call fcn.00406d70
push eax
call dword [sym.imp.USER32.dll_CharNextW]
mov ecx, eax
mov ebx, ecx
mov dword [esp + 0x18], ebx
movzx eax, word [ecx]
test ax, ax
je 0x403e70
mov esi, eax
push 0x20
pop edx
movzx eax, si
cmp si, dx
jne 0x403dac
add ecx, 2
movzx eax, word [ecx]
cmp ax, dx
je 0x403da1
mov ebx, edx
movzx esi, ax
movzx edx, ax
cmp ax, word [esp + 0x14]
jne 0x403dc4
movzx edx, word [ecx + 2]
push 0x22
pop eax
mov ebx, eax
cmp si, word [esp + 0x14]
lea eax, [ecx + 2]
cmovne eax, ecx
cmp dx, 0x2f
jne 0x403e2e
push 0x53
add eax, 2
pop ecx
push 0x20
pop edx
cmp word [eax], cx
jne 0x403dfb
movzx ecx, word [eax + 2]
cmp cx, dx
je 0x403df1
test cx, cx
jne 0x403dfb
mov dword [0x47a320], 1
cmp dword [eax], 0x43004e
jne 0x403e1d
cmp dword [eax + 4], 0x430052
jne 0x403e1d
movzx ecx, word [eax + 8]
cmp cx, dx
je 0x403e1a
test cx, cx
jne 0x403e1d
or ebp, 4
cmp dword [eax - 4], 0x2f0020
jne 0x403e2e
cmp dword [eax], 0x3d0044
je 0x403e58
push ebx
push eax
call fcn.00406d70
mov ecx, eax
push 0x22
pop ebx
movzx eax, word [ecx]
mov edx, eax
cmp ax, bx
jne 0x403e4a
add ecx, 2
movzx edx, word [ecx]
movzx esi, dx
test dx, dx
jne 0x403d96
jmp 0x403e6c
xor ecx, ecx
mov word [eax - 4], cx
add eax, 4
push eax
push 0x4cf000
call fcn.004073bd
mov ebx, dword [esp + 0x18]
mov esi, dword [sym.imp.KERNEL32.dll_GetTempPathW]
push 0x4df000
push 0x2000
call esi
call fcn.004041c5
test eax, eax
jne 0x403ef6
push 0x1ffb
push 0x4df000
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryW]
push str.Temp
push 0x4df000
call sub.KERNEL32.dll_lstrcatW
call fcn.004041c5
test eax, eax
jne 0x403ef6
push 0x4df000
push 0x1ffc
call esi
push 0x409e38
mov esi, 0x4df000
push esi
call sub.KERNEL32.dll_lstrcatW
push esi
mov esi, dword [sym.imp.KERNEL32.dll_SetEnvironmentVariableW]
push str.TEMP
call esi
push 0x4df000
push 0x409e4c
call esi
call fcn.004041c5
test eax, eax
je 0x4040de
push 0x4db000
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
push ebp
call fcn.004038a9
mov edi, eax
test edi, edi
jne 0x4040de
cmp dword [0x47a244], eax
je 0x403f7e
xor ebp, ebp
push ebp
push 0x4cb000
call fcn.00406d70
mov esi, eax
mov eax, 0x4cb000
jmp 0x403f43
cmp dword [esi], 0x5f0020
jne 0x403f40
cmp dword [esi + 4], 0x3d003f
je 0x403f47
sub esi, 2
cmp esi, eax
jae 0x403f2f
mov edi, 0x409cb0
cmp esi, eax
jb 0x403f98
xor eax, eax
mov word [esi], ax
add esi, 8
push esi
call fcn.00406db2
test eax, eax
je 0x404128
push esi
push 0x4cf000
call fcn.004073bd
push esi
push 0x4d3000
call fcn.004073bd
mov edi, ebp
or dword [0x47a32c], 0xffffffff
call fcn.0040600a
push 1
mov ebx, eax
call fcn.00406e62
jmp 0x4040e2
call fcn.00406ade
push 0x4df000
mov dword [esp + 0x1c], eax
call sub.KERNEL32.dll_lstrlenW
push ebx
push section..ndata
mov esi, eax
call fcn.004073bd
cmp word [0x4cf000], bp
jne 0x403fd0
push 0x4d7000
push 0x4cf000
call fcn.004073bd
xor ebx, ebx
lea eax, [esi*2 + 0x4df000]
inc ebx
mov dword [esp + 0x14], eax
mov esi, ebp
movzx ebp, bx
push ebp
push str.nsu_X.tmp
push eax
call dword [sym.imp.USER32.dll_wsprintfW]
mov eax, dword [0x47a250]
add esp, 0xc
push dword [eax + 0x120]
push 0x48f000
call fcn.00406490
cmp dword [esp + 0x18], 0
push 0x4df000
je 0x40401b
call fcn.00406435
jmp 0x404020
call fcn.00406415
test eax, eax
je 0x40406d
push 0x48f000
call dword [sym.imp.KERNEL32.dll_GetFileAttributesW]
test eax, 0x400
jne 0x404106
push 0x48f000
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
test eax, eax
je 0x404106
push 1
push 0x4df000
call fcn.00406f62
mov eax, esi
inc esi
test eax, eax
jne 0x404106
mov eax, dword [esp + 0x14]
jmp 0x403fe3
push 0x4df000
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryW]
push 0
push 0x4df000
call fcn.0040681f
push 1
push 0x48f000
push 0x4e7000
call dword [sym.imp.KERNEL32.dll_CopyFileW]
test eax, eax
je 0x4040de
push 0
push 0x48f000
call fcn.0040681f
mov eax, dword [0x47a250]
push dword [eax + 0x124]
push 0x493000
call fcn.00406490
push 0x493000
call fcn.00406f1f
test eax, eax
jne 0x404119
mov eax, esi
inc esi
test eax, eax
jne 0x4040de
push 0x48f000
call fcn.00406d49
test eax, eax
je 0x404064
mov ebx, dword [esp + 0x10]
xor ebp, ebp
call fcn.00403b91
call dword [sym.imp.ole32.dll_OleUninitialize]
test edi, edi
je 0x40412c
push 0x200010
push edi
call fcn.0040734b
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
mov eax, dword [esp + 0x14]
inc ebx
push 0
pop ebp
test bx, bx
jne 0x403fde
jmp 0x4040de
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
xor ebp, ebp
mov edi, ebp
mov ebx, edi
jmp 0x4040e4
mov ebx, ebp
jmp 0x4040e2
cmp dword [0x47a314], 0
je 0x4041b1
lea eax, [esp + 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 0x404181
lea eax, [esp + 0x20]
push eax
push str.SeShutdownPrivilege
push ebp
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueW]
push ebp
push ebp
push ebp
lea eax, [esp + 0x28]
mov dword [esp + 0x28], 1
push eax
push ebp
push dword [esp + 0x2c]
mov dword [esp + 0x40], 2
call dword [sym.imp.ADVAPI32.dll_AdjustTokenPrivileges]
push 4
call fcn.00407189
mov esi, 0x80040002
test eax, eax
je 0x40419d
push esi
push 0x25
push ebp
push ebp
push ebp
call eax
test eax, eax
je 0x4041aa
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x4041b1
push 9
call fcn.0040153b
cmp dword [0x47a32c], 0xffffffff
cmovne ebx, dword [0x47a32c]
push ebx
jmp 0x404100