Function at 0x403ac2
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 0x403b4c
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 0x403b5d
and word [ebp - 0x132], 0
mov eax, dword [ebp - 0x134]
movzx ecx, byte [ebp - 0x138]
mov dword [0x42ccb8], 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 [0x42ccbc], eax
cmp word [0x42ccbe], 0x600
je 0x403bb0
push ebx
call fcn.00407237
cmp eax, ebx
je 0x403bb0
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.004071c7
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], 0
jne 0x403bb5
push 0xb
call fcn.00407237
push 9
call fcn.00407237
push 7
mov dword [0x42cc04], eax
call fcn.00407237
cmp eax, ebx
je 0x403bf8
push 0x1e
call eax
test eax, eax
je 0x403bf8
or byte [0x42ccbc], 0x80
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x42ccc0], eax
push ebx
lea eax, [ebp - 0x3f4]
push 0x2b4
push eax
push ebx
push 0x4228a0
call dword [sym.imp.SHELL32.dll_SHGetFileInfoW]
push str.NSIS_Error
push 0x42bc00
call fcn.00406c1c
call dword [sym.imp.KERNEL32.dll_GetCommandLineW]
mov esi, 0x437000
push eax
push esi
call fcn.00406c1c
push 0x22
mov eax, esi
pop esi
mov dword [0x42cc00], 0x400000
cmp word [0x437000], si
jne 0x403c63
mov edi, esi
mov eax, 0x437002
push edi
push eax
call fcn.00406518
push eax
call dword [sym.imp.USER32.dll_CharNextW]
mov ecx, eax
mov dword [ebp - 0xc], ecx
jmp 0x403d6d
push 0x20
pop edx
cmp ax, dx
jne 0x403c8a
inc ecx
inc ecx
cmp word [ecx], dx
je 0x403c83
cmp word [ecx], si
mov dword [ebp - 8], edx
jne 0x403c97
inc ecx
mov dword [ebp - 8], esi
inc ecx
cmp word [ecx], 0x2f
jne 0x403d5b
inc ecx
inc ecx
cmp word [ecx], 0x53
jne 0x403cc1
mov ax, word [ecx + 2]
cmp ax, dx
je 0x403cb7
cmp ax, bx
jne 0x403cc1
mov dword [0x42cca0], 1
movzx eax, word [0x40b07e]
cdq
shld edx, eax, 0x10
shl eax, 0x10
mov edi, eax
xor esi, esi
movzx eax, word [0x40b07c]
cdq
movzx edx, word [str.NCRC]
or edi, eax
movzx eax, word [0x40b07a]
shl eax, 0x10
or eax, edx
cdq
or esi, eax
mov eax, dword [ecx]
or edi, edx
cmp eax, esi
jne 0x403d16
mov eax, dword [ecx + 4]
cmp eax, edi
jne 0x403d16
mov ax, word [ecx + 8]
cmp ax, 0x20
je 0x403d12
cmp ax, bx
jne 0x403d16
or dword [ebp - 0x10], 4
movzx eax, word [0x40b072]
cdq
shld edx, eax, 0x10
shl eax, 0x10
mov edi, eax
xor esi, esi
movzx eax, word [0x40b070]
cdq
movzx edx, word [str.__D]
or edi, eax
movzx eax, word [0x40b06e]
shl eax, 0x10
or eax, edx
cdq
or esi, eax
mov eax, dword [ecx - 4]
or edi, edx
cmp eax, esi
jne 0x403d58
mov eax, dword [ecx]
cmp eax, edi
je 0x403d7b
push 0x22
pop esi
push dword [ebp - 8]
push ecx
call fcn.00406518
mov ecx, eax
cmp word [ecx], si
jne 0x403d6d
inc ecx
inc ecx
mov ax, word [ecx]
cmp ax, bx
jne 0x403c7b
jmp 0x403d8d
mov word [ecx - 4], bx
add ecx, 4
push ecx
push 0x437800
call fcn.00406c1c
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathW]
mov esi, 0x439800
push esi
push 0x400
call edi
call fcn.00403a91
test eax, eax
jne 0x403dff
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryW]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatW
call fcn.00403a91
test eax, eax
jne 0x403dff
push esi
push 0x3fc
call edi
push 0x40b058
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 0x40b044
call edi
call fcn.00403a91
test eax, eax
je 0x403ff5
push 0x439000
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
push dword [ebp - 0x10]
call fcn.00403552
cmp eax, ebx
mov dword [ebp - 4], eax
jne 0x403ff5
cmp dword [0x42cc1c], ebx
je 0x403eca
push ebx
push 0x437000
call fcn.00406518
mov edi, eax
cmp edi, 0x437000
jb 0x403e8e
movzx eax, word [0x40b03e]
cdq
shld edx, eax, 0x10
shl eax, 0x10
mov ebx, eax
movzx eax, word [0x40b03c]
movzx ecx, word [str.___]
cdq
or ebx, eax
movzx eax, word [0x40b03a]
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 0x403e82
mov edx, dword [edi + 4]
cmp edx, eax
je 0x403e8c
dec edi
dec edi
cmp edi, 0x437000
jae 0x403e75
xor ebx, ebx
cmp edi, 0x437000
mov dword [ebp - 4], str.Error_launching_installer
jb 0x403ee5
mov word [edi], bx
add edi, 8
push edi
call fcn.004065f3
test eax, eax
je 0x403ff5
push edi
push 0x437800
call fcn.00406c1c
push edi
push 0x438000
call fcn.00406c1c
mov dword [ebp - 4], ebx
or dword [0x42ccac], 0xffffffff
call fcn.004041c1
push 1
mov dword [ebp - 0x14], eax
call fcn.00406f52
jmp 0x403ff5
call fcn.0040618e
push 0x40b02c
push esi
mov ebx, eax
call sub.KERNEL32.dll_lstrcatW
test ebx, ebx
je 0x403f06
push 0x40b028
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 0x403ff3
test ebx, ebx
push esi
je 0x403f32
call fcn.004060f4
jmp 0x403f37
call fcn.00406171
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryW]
xor ebx, ebx
cmp word [0x437800], bx
jne 0x403f54
push edi
push 0x437800
call fcn.00406c1c
push dword [ebp - 0xc]
push section..ndata
call fcn.00406c1c
movzx eax, word [0x40b016]
movzx ecx, word [0x40b014]
shl eax, 0x10
or eax, ecx
mov dword [ebp - 8], 0x1a
mov dword [0x42d800], eax
mov edi, 0x4220a0
mov eax, dword [0x42cc10]
push dword [eax + 0x120]
push edi
call fcn.00406c59
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileW]
cmp dword [ebp - 4], ebx
je 0x403fe0
push 1
push edi
push 0x43a800
call dword [sym.imp.KERNEL32.dll_CopyFileW]
test eax, eax
je 0x403fe0
push ebx
push edi
call fcn.004069dc
mov eax, dword [0x42cc10]
push dword [eax + 0x124]
push edi
call fcn.00406c59
push edi
call fcn.004061a6
cmp eax, ebx
je 0x403fe0
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [ebp - 4], ebx
inc word [0x42d800]
dec dword [ebp - 8]
jne 0x403f85
push ebx
push esi
call fcn.004069dc
xor ebx, ebx
call fcn.004040ae
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [ebp - 4], ebx
je 0x40401a
push 0x200010
push dword [ebp - 4]
call fcn.00406223
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
cmp dword [0x42cc94], ebx
je 0x404098
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 0x404068
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.00407237
cmp eax, ebx
mov esi, 0x80040002
je 0x404084
push esi
push 0x25
push ebx
push ebx
push ebx
call eax
test eax, eax
je 0x404091
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x404098
push 9
call fcn.0040140b
mov eax, dword [0x42ccac]
cmp eax, 0xffffffff
je 0x4040a5
mov dword [ebp - 0x14], eax
push dword [ebp - 0x14]
call dword [sym.imp.KERNEL32.dll_ExitProcess]