Flaws in popular Internet-based telephony systems could be exploited to create a network of hacked phone accounts. Researchers at Secure Science recently discovered ways to make unauthorized calls from both Skype [securescience.net] and the new Google Voice communications systems. The developers behind the Android malware have a new variant that spies on instant messages in WhatsApp, Telegram, Skype and more. Read the full story [pdf] here s the paper [pdf], explaining the Google Voice attack..
Source: https://threatpost.com/exploiting-skype-building-telephone-botnet-041309/72505/