Much of the campaign involved sending spear-phishing emails, where an unsuspecting target would click on a link, activating a program that would then runs quietly in the background of their computer network.
We understand from Epitiro (but have not made any enquiries or carried out any research in relation to this) that the App uses very little bandwidth as it reports on data already present on the phone through its normal background communications within the network.
The Cleaner scans files, drives or directories as specified by the user, though it does not operate in the background to automatically check as the more expensive programs from Symantec and Network Associates do.
Running in the background, too many third-party apps overuse system resources, memory, and network to the point where almost any machine with multitasking capability ends up running slowly and killing battery life.