Security researchers watch for a possible Flashback comeback by the botnet operators.
There were between 30,000 and 100,000 WordPress sites infected in late February and early March, 85% of which are in the United States, said Vicente Diaz, senior security analyst for Kaspersky Lab, in a briefing.
Kaspersky Lab researchers say the infected WordPress blog sites were rigged with code that silently redirected visitors to a malicious server. “When the connection was made to the malicious server, that server would determine which OS was running and serve exploits accordingly,” says Roel Schouwenberg, senior researcher for Kaspersky. It was a pay-per-install scheme to spread malware, including the Flashback Trojan.