Hi, Waller92. If ever you have a problem,we're here to help. This rather lengthy explanation from Symantec covers the file in question.
This file is from the core component SymVT. SymVT is designed to verify known
trusted files. In order to do so it creates a catalog database for lookups of
known signed files. The file is placed one directory up from the dated
definitions folder so that definitions refresh wouldn’t result in requiring a
re-creation of the entire database. As the file is a database designed to verify
known files, it need not be updated continuously and, at present, we are still
running with the original release of the database. We expect to update the
database on a regular basis beginning in Spring of 2010. The file was first
introduced with definitions of August 26th, 2009. The umcat_01.db will only be
generated if a user mode scan encountered a detection. The cat.db file is always
generated.
