Troj/Poison-AT is a Trojan for the Windows platform.
When run Troj/Poison-AT copies itself to <System>\Msxmlcol.exe and creates the file <System>\Msxmlcol (which can be safely deleted). The following registry entry is set:
HKLM\SOFTWARE\Microsoft\Active Setup\Installed Components\{7D38C6DC-D78C-9AD6-B45D-4DAAC33FD5EF}
StubPath
<System>\Msxmlcol.exe