Function at 0x403b2d
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:
push ebp
mov ebp, esp
sub esp, 0x3f4
push ebx
push esi
push edi
push 0x20
pop edi
xor ebx, ebx
push 0x8001
mov dword [ebp - 0x14], ebx
mov dword [ebp - 4], str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
mov dword [ebp - 0x10], ebx
call dword [sym.imp.KERNEL32.dll_SetErrorMode]
mov esi, dword [sym.imp.KERNEL32.dll_GetVersionExW]
lea eax, [ebp - 0x140]
push eax
mov dword [ebp - 0x12c], ebx
mov dword [ebp - 0x2c], ebx
mov dword [ebp - 0x28], ebx
mov dword [ebp - 0x140], 0x11c
call esi
test eax, eax
jne 0x403bb7
lea eax, [ebp - 0x140]
mov dword [ebp - 0x140], 0x114
push eax
call esi
mov ax, word [ebp - 0x12c]
mov ecx, dword [ebp - 0x112]
sub ax, 0x53
add ecx, 0xffffffd0
neg ax
sbb eax, eax
mov byte [ebp - 0x26], 4
not eax
and eax, ecx
mov word [ebp - 0x2c], ax
cmp dword [ebp - 0x13c], 0xa
jae 0x403bc8
and word [ebp - 0x132], 0
mov eax, dword [ebp - 0x134]
movzx ecx, byte [ebp - 0x138]
mov dword [0x42c338], eax
xor eax, eax
mov ah, byte [ebp - 0x13c]
movzx eax, ax
or eax, ecx
xor ecx, ecx
mov ch, byte [ebp - 0x2c]
movzx ecx, cx
shl eax, 0x10
or eax, ecx
movzx ecx, byte [ebp - 0x26]
or eax, ecx
mov dword [0x42c33c], eax
cmp word [0x42c33e], 0x600
je 0x403c1b
push ebx
call fcn.00406f63
cmp eax, ebx
je 0x403c1b
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00406ef3
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], 0
jne 0x403c20
push 0xb
call fcn.00406f63
push 9
call fcn.00406f63
push 7
mov dword [0x42c264], eax
call fcn.00406f63
cmp eax, ebx
je 0x403c63
push 0x1e
call eax
test eax, eax
je 0x403c63
or byte [0x42c33c], 0x80
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x42c340], eax
push ebx
lea eax, [ebp - 0x3f4]
push 0x2b4
push eax
push ebx
push 0x423698
call dword [sym.imp.SHELL32.dll_SHGetFileInfoW]
push str.NSIS_Error
push 0x42b260
call fcn.00406b96
call dword [sym.imp.KERNEL32.dll_GetCommandLineW]
mov esi, 0x437000
push eax
push esi
call fcn.00406b96
push 0x22
mov eax, esi
pop esi
mov dword [0x42c260], 0x400000
cmp word [0x437000], si
jne 0x403cce
mov edi, esi
mov eax, 0x437002
push edi
push eax
call fcn.0040644e
push eax
call dword [sym.imp.USER32.dll_CharNextW]
mov ecx, eax
mov dword [ebp - 0xc], ecx
jmp 0x403dd8
push 0x20
pop edx
cmp ax, dx
jne 0x403cf5
inc ecx
inc ecx
cmp word [ecx], dx
je 0x403cee
cmp word [ecx], si
mov dword [ebp - 8], edx
jne 0x403d02
inc ecx
mov dword [ebp - 8], esi
inc ecx
cmp word [ecx], 0x2f
jne 0x403dc6
inc ecx
inc ecx
cmp word [ecx], 0x53
jne 0x403d2c
mov ax, word [ecx + 2]
cmp ax, dx
je 0x403d22
cmp ax, bx
jne 0x403d2c
mov dword [0x42c320], 1
movzx eax, word [0x40c2e2]
cdq
shld edx, eax, 0x10
shl eax, 0x10
mov edi, eax
xor esi, esi
movzx eax, word [0x40c2e0]
cdq
movzx edx, word [str.NCRC]
or edi, eax
movzx eax, word [0x40c2de]
shl eax, 0x10
or eax, edx
cdq
or esi, eax
mov eax, dword [ecx]
or edi, edx
cmp eax, esi
jne 0x403d81
mov eax, dword [ecx + 4]
cmp eax, edi
jne 0x403d81
mov ax, word [ecx + 8]
cmp ax, 0x20
je 0x403d7d
cmp ax, bx
jne 0x403d81
or dword [ebp - 0x10], 4
movzx eax, word [0x40c2d6]
cdq
shld edx, eax, 0x10
shl eax, 0x10
mov edi, eax
xor esi, esi
movzx eax, word [0x40c2d4]
cdq
movzx edx, word [str.__D]
or edi, eax
movzx eax, word [0x40c2d2]
shl eax, 0x10
or eax, edx
cdq
or esi, eax
mov eax, dword [ecx - 4]
or edi, edx
cmp eax, esi
jne 0x403dc3
mov eax, dword [ecx]
cmp eax, edi
je 0x403de6
push 0x22
pop esi
push dword [ebp - 8]
push ecx
call fcn.0040644e
mov ecx, eax
cmp word [ecx], si
jne 0x403dd8
inc ecx
inc ecx
mov ax, word [ecx]
cmp ax, bx
jne 0x403ce6
jmp 0x403df8
mov word [ecx - 4], bx
add ecx, 4
push ecx
push 0x437800
call fcn.00406b96
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathW]
mov esi, 0x439800
push esi
push 0x400
call edi
call fcn.00403afc
test eax, eax
jne 0x403e6a
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryW]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatW
call fcn.00403afc
test eax, eax
jne 0x403e6a
push esi
push 0x3fc
call edi
push 0x40c2bc
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 0x40c2a8
call edi
call fcn.00403afc
test eax, eax
je 0x404059
push 0x439000
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
push dword [ebp - 0x10]
call fcn.0040333f
cmp eax, ebx
mov dword [ebp - 4], eax
jne 0x404059
cmp dword [0x42c284], ebx
je 0x403f35
push ebx
push 0x437000
call fcn.0040644e
mov edi, eax
cmp edi, 0x437000
jb 0x403ef9
movzx eax, word [0x40c2a2]
cdq
shld edx, eax, 0x10
shl eax, 0x10
mov ebx, eax
movzx eax, word [0x40c2a0]
movzx ecx, word [str.___]
cdq
or ebx, eax
movzx eax, word [0x40c29e]
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 0x403eed
mov edx, dword [edi + 4]
cmp edx, eax
je 0x403ef7
dec edi
dec edi
cmp edi, 0x437000
jae 0x403ee0
xor ebx, ebx
cmp edi, 0x437000
mov dword [ebp - 4], str.Error_launching_installer
jb 0x403f49
mov word [edi], bx
add edi, 8
push edi
call fcn.0040656d
test eax, eax
je 0x404059
push edi
push 0x437800
call fcn.00406b96
push edi
push 0x438000
call fcn.00406b96
mov dword [ebp - 4], ebx
or dword [0x42c32c], 0xffffffff
call fcn.004041ec
mov dword [ebp - 0x14], eax
jmp 0x404059
call fcn.0040611d
push 0x40c290
push esi
mov ebx, eax
call sub.KERNEL32.dll_lstrcatW
test ebx, ebx
je 0x403f6a
push 0x40c28c
push esi
call sub.KERNEL32.dll_lstrcatW
push str..tmp
push esi
call sub.KERNEL32.dll_lstrcatW
mov edi, 0x438800
push edi
push esi
call dword [sym.imp.KERNEL32.dll_lstrcmpiW]
test eax, eax
je 0x404057
test ebx, ebx
push esi
je 0x403f96
call fcn.00406083
jmp 0x403f9b
call fcn.00406100
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryW]
xor ebx, ebx
cmp word [0x437800], bx
jne 0x403fb8
push edi
push 0x437800
call fcn.00406b96
push dword [ebp - 0xc]
push section..ndata
call fcn.00406b96
movzx eax, word [0x40c27a]
movzx ecx, word [0x40c278]
shl eax, 0x10
or eax, ecx
mov dword [ebp - 8], 0x1a
mov dword [0x42d800], eax
mov edi, 0x422e98
mov eax, dword [0x42c274]
push dword [eax + 0x120]
push edi
call fcn.00406bd3
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
cmp dword [ebp - 4], ebx
je 0x404044
push 1
push edi
push 0x43a800
call dword [sym.imp.KERNEL32.dll_CopyFileW]
test eax, eax
je 0x404044
push ebx
push edi
call fcn.00406956
mov eax, dword [0x42c274]
push dword [eax + 0x124]
push edi
call fcn.00406bd3
push edi
call fcn.00406135
cmp eax, ebx
je 0x404044
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [ebp - 4], ebx
inc word [0x42d800]
dec dword [ebp - 8]
jne 0x403fe9
push ebx
push esi
call fcn.00406956
xor ebx, ebx
call fcn.00404112
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [ebp - 4], ebx
je 0x40407e
push 0x200010
push dword [ebp - 4]
call fcn.004061b2
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
cmp dword [0x42c314], ebx
je 0x4040fc
lea eax, [ebp - 0xc]
push eax
push 0x28
call dword [sym.imp.KERNEL32.dll_GetCurrentProcess]
push eax
call dword [sym.imp.ADVAPI32.dll_OpenProcessToken]
test eax, eax
je 0x4040cc
lea eax, [ebp - 0x20]
push eax
push str.SeShutdownPrivilege
push ebx
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueW]
push ebx
push ebx
lea eax, [ebp - 0x24]
push ebx
push eax
push ebx
push dword [ebp - 0xc]
mov dword [ebp - 0x24], 1
mov dword [ebp - 0x18], 2
call dword [sym.imp.ADVAPI32.dll_AdjustTokenPrivileges]
push 4
call fcn.00406f63
cmp eax, ebx
mov esi, 0x80040002
je 0x4040e8
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x4040f5
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x4040fc
push 9
call fcn.0040140a
mov eax, dword [0x42c32c]
cmp eax, 0xffffffff
je 0x404109
mov dword [ebp - 0x14], eax
push dword [ebp - 0x14]
call dword [sym.imp.KERNEL32.dll_ExitProcess]