cygwin col.exe reported

A Norton internet security scheduled scan reported that c:\cygwin\bin\col.exe contained a Trojan.ADH.2.

 

Is this real or a false positive?

 

If it was real, why didn't Norton detect it when the file was being installed by cygwin setup?

 

The activity field says "Actions performed: 1". What action would this have been?

 

Thanks