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Attackers are using Flash exploits and foisting ransomware through real time advertising bidding networks, FireEye researchers say. The attacks link to malicious or compromised advertising sites which participate in real time bidding systems in which ad inventory is sold to and by publishers. More than 1700 malicious advertising requests have been detected that led to malicious .swf Flash files being downloaded over hundreds of unnamed sites. "We believe this activity is part of an active malvertising operation," FireEye Labs researchers say in an advisory. "These ads can come from ad servers
After being disrupted by law enforcement in December 2013, the peer-to-peer (P2P) ZeroAccess botnet – also known as Sirefef – has resumed advertising click fraud activities, according to the Dell SecureWorks Counter Threat Unit (CTU). The team first noticed the botnet reactivating from March 21, 2014, to July 2, 2014, and then on Jan. 15 it started to distribute click-fraud templates to compromised systems, a Wednesday post indicates, noting that the botnet is made up of hosts from previous compromises and there have been no observed attempts to expand the botnet. Currently, the ZeroAccess bot