German Chaos Computer Club published an analysis report of a backdoor trojan that they claim had been used by German police during investigations in order to capture VoIP and IM communication on a suspect s PC. The number of applications infected by the various components is 15 in total. Skype is targeted as well, but also web browsers, instant messaging applications and voice-over-ip software, such as ICQ, MSN Messenger, Low-Rate Voip, paltalk, SimpPro, sipgate X-Lite, VoipBuster and Yahoo! Messenger.
Source: https://threatpost.com/federal-trojans-got-big-brother-101911/75772/