Released Tuesday, Symantec's report on rogue security software noted that 250 rogue security programs launched some 43 million attempts to prompt user installation between July 2008 and June 2009.
Further analysis on the top 50 most reported scareware was carried out between July and August this year, during which Symantec found that 38 of the programs had been detected prior to Jul. 1, 2008.
"The continued prevalence of these programs emphasizes the ongoing threat they pose to potential victims, despite efforts to shut them down and raise public awareness," the security vendor said in the report.
The five most commonly reported rogue security applications during the study were SpywareGuard 2008, AntiVirus 2008, AntiVirus 2009, Spyware Secure and XP AntiVirus.
For more, read "Rogue security programs are 'ongoing threat'" from ZDNet Asia.