Repair permissions give odd listing.

I'm running 10.7.5 on a 2011 iMac with 12 mgb ram and an Intel 2.5ghz Quad Core i5 chip.

My question is in regards to what I'm getting if I repair permissions.

Warning: SUID file “System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAg ent” has been modified and will not be repaired.

As I've never used Remote Management I'm not sure where this is coming from and wonder if someone has hacked my computer to allow outside access? Any info would be greatly appreciated.

Rich