RSA researchers believe individuals behind the Carberp botnet are taking advantage of an opening in the marketplace, left by the withdrawing Citadel network.
Researchers have spotted a fake installer trojan, targeting the Mac OS X platform, which attempts to hit victims with fraudulent charges on their cell phone bills.
Banking malware Yahos, capable of stealing personal information, spread on Facebook for two years prior to the arrests. The social networking site helped authorities capture the suspects.