Yeah you can do stuff with mIRC and pirch with the script.ini which is mainly used to setup your IRC client with some type of automation like IRC auditing, anti-flood, anti-CAPSlock, (ect)... it all deppends on your scripting. Anyways these scripts can also be used to spam, flood, send downloads and URLs which can contain malware, and blah blah blah....

I haven't seen much on Bat.QuickFormat.Trojan but based on the name itself I beleave its nothing more than a little batch file that deletes stuff. Yawn...