Function at 0x403c53
Capabilities:
Accept command line arguments
Copy file
Delete file
Get common file path
Shutdown system
Terminate process

Disassembly:
sub esp, 0x20
push ebx
push ebp
push esi
xor ebx, ebx
push edi
mov dword [esp + 0x18], ebx
mov dword [esp + 0x10], str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
mov byte [esp + 0x14], 0x20
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
push str.NSIS_Error
push 0x423b40
mov dword [0x4243f0], eax
call sub.KERNEL32.dll_lstrcpyA
mov esi, 0x42b400
mov edi, 0x400
push esi
push edi
call dword [sym.imp.KERNEL32.dll_GetTempPathA]
call fcn.00403c1f
mov ebp, dword [sym.imp.KERNEL32.dll_lstrcatA]
test eax, eax
jne 0x403cd0
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push esi
call ebp
call fcn.00403c1f
test eax, eax
je 0x403e17
mov esi, 0x42a000
push esi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push edi
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
push eax
push esi
call dword [sym.imp.KERNEL32.dll_lstrcpynA]
push 0
call dword [sym.imp.KERNEL32.dll_GetModuleHandleA]
cmp byte [0x42a000], 0x22
mov dword [0x424340], eax
jne 0x403d0b
mov byte [esp + 0x14], 0x22
mov esi, 0x42a001
push dword [esp + 0x14]
push esi
call fcn.0040624a
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov edi, eax
mov dword [esp + 0x1c], edi
jmp 0x403d87
cmp cl, 0x20
jne 0x403d2f
inc eax
cmp byte [eax], 0x20
je 0x403d29
cmp byte [eax], 0x22
mov byte [esp + 0x14], 0x20
jne 0x403d3f
inc eax
mov byte [esp + 0x14], 0x22
cmp byte [eax], 0x2f
jne 0x403d77
inc eax
cmp byte [eax], 0x53
jne 0x403d58
mov cl, byte [eax + 1]
or cl, 0x20
cmp cl, 0x20
jne 0x403d58
or ebx, 2
cmp dword [eax], 0x4352434e
jne 0x403d6e
mov cl, byte [eax + 4]
or cl, 0x20
cmp cl, 0x20
jne 0x403d6e
or ebx, 4
cmp dword [eax - 2], 0x3d442f20
je 0x403d8f
push dword [esp + 0x14]
push eax
call fcn.0040624a
cmp byte [eax], 0x22
jne 0x403d87
inc eax
mov cl, byte [eax]
test cl, cl
jne 0x403d24
jmp 0x403da1
and byte [eax - 2], 0
add eax, 2
push eax
push 0x42a400
call sub.KERNEL32.dll_lstrcpyA
push ebx
call fcn.004035b8
xor ebx, ebx
cmp eax, ebx
mov dword [esp + 0x10], eax
jne 0x403e17
cmp dword [0x424354], ebx
je 0x403e07
push ebx
push edi
call fcn.0040624a
mov esi, eax
jmp 0x403dcd
cmp dword [esi], 0x3d3f5f20
je 0x403dd1
dec esi
cmp esi, edi
jae 0x403dc4
cmp esi, edi
mov dword [esp + 0x10], str.Error_launching_installer
jb 0x403e43
and byte [esi], 0
add esi, 4
push esi
call fcn.004062ff
test eax, eax
je 0x403e17
push esi
push 0x42a400
call sub.KERNEL32.dll_lstrcpyA
push esi
push 0x42a800
call sub.KERNEL32.dll_lstrcpyA
mov dword [esp + 0x10], ebx
or dword [0x4243ec], 0xffffffff
call fcn.00404030
mov dword [esp + 0x18], eax
call fcn.00403ff3
call dword [sym.imp.ole32.dll_OleUninitialize]
cmp dword [esp + 0x10], 0
je 0x403f36
push 0x100010
push dword [esp + 0x14]
call fcn.00406051
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
mov dword [esp + 0x14], ebx
mov edi, 0x41f919
mov esi, 0x41f918
mov ebx, 0x41f518
push 0x42b400
push edi
mov byte [0x41f918], 0x22
call sub.KERNEL32.dll_lstrcpyA
push str.ANSISu_.exe
push esi
call ebp
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
cmp dword [esp + 0x10], 0
je 0x403f1c
push 0x400
push ebx
push dword [0x424340]
call dword [sym.imp.KERNEL32.dll_GetModuleFileNameA]
lea eax, [eax + 0x41f50d]
push 0x4091fd
push eax
call dword [sym.imp.KERNEL32.dll_lstrcmpiA]
test eax, eax
je 0x403e17
push 0
push edi
push ebx
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x403f1c
push 0
push edi
call fcn.00406455
cmp byte [0x42a400], 0
je 0x403eda
push 0x42a400
push ebx
call sub.KERNEL32.dll_lstrcpyA
jmp 0x403ee0
push ebx
call fcn.00406266
push 0x40927c
push esi
call ebp
push dword [esp + 0x1c]
push esi
call ebp
push str.___
push esi
call ebp
push ebx
push esi
call ebp
push esi
call fcn.0040621e
push 0x42b400
push esi
call fcn.00405fd9
test eax, eax
je 0x403f1c
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
and dword [esp + 0x10], 0
inc byte [str.ANSISu_.exe]
inc dword [esp + 0x14]
cmp dword [esp + 0x14], 0x1a
jl 0x403e56
jmp 0x403e17
cmp dword [0x4243d4], 0
je 0x403fdb
push str.ADVAPI32.dll
call dword [sym.imp.KERNEL32.dll_GetModuleHandleA]
mov edi, eax
test edi, edi
je 0x403fc6
mov esi, dword [sym.imp.KERNEL32.dll_GetProcAddress]
push str.OpenProcessToken
push edi
call esi
push str.LookupPrivilegeValueA
push edi
mov ebp, eax
call esi
push str.AdjustTokenPrivileges
push edi
mov ebx, eax
call esi
test ebp, ebp
mov edi, eax
je 0x403fc6
test ebx, ebx
je 0x403fc6
test edi, edi
je 0x403fc6
lea eax, [esp + 0x1c]
push eax
push 0x28
call dword [sym.imp.KERNEL32.dll_GetCurrentProcess]
push eax
call ebp
test eax, eax
je 0x403fc6
lea eax, [esp + 0x24]
xor esi, esi
push eax
push str.SeShutdownPrivilege
push esi
call ebx
push esi
push esi
lea eax, [esp + 0x28]
push esi
push eax
push esi
push dword [esp + 0x30]
mov dword [esp + 0x38], 1
mov dword [esp + 0x44], 2
call edi
push 0
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403fdb
push 9
call fcn.00401d6e
mov eax, dword [0x4243ec]
cmp eax, 0xffffffff
je 0x403fe9
mov dword [esp + 0x18], eax
push dword [esp + 0x18]
call dword [sym.imp.KERNEL32.dll_ExitProcess]