Found a Trojan, but how do I know if its being used?

I recently found a trojan called acid battery on my PC. It puts a file called expI orer.exe in my windows/system32 folder. NOw that I've found it, does anyone know how to tell if anyone's been using it to spy on me?

 

you might look in your firewall log for an entry with that file name.

 

Thanks, unfortunately though, I recently changed my log to only keep records for one day. I checked today, but found no instance of it being used. Maybe Ill let the trojan remain a little while so perhaps I can catch someone using it.

Any other ideas besides checking my firewall log would be appreciated.

 

Without a record of what it has been doing It will be hard to know if it has been phoning home or not.

 

you could use NetMeter it's a little network monitor so you'll know when something has made an internet connection. if something does you could then use a sniffer to see what is happening.