There are no obvious symptoms.
For some versions, in the folder with the patched files hidden files with the extension ".t" may appear.
Please let BitDefender disinfect your files.
Petrea Ruslan, virus researcher
This is a generic detection for PE executables which have been patched by the Luder, Banwarum or Mixor worms.
The appended code executes certain worm components when the patched file is executed, but it is unable to spread by itself.