GreatOnlineSecurityScan.com is a malicious website promoting System Security (SystemSecurity) rogue anti-spyware. System Security is a browser hijacker that makes its way into the compromised computer as a Vundo Trojan and secretly modifies browser settings. This can be done without the users consent or knowledge. GreatOnlineSecurityScan.com will welcome you by displaying fake warning messages about non-existent infections on your computer system. In addition, GreatOnlineSecurityScan.com mimics My computer window and pretends to scan its drives, folders and subfolders to ‘detect’ parasites. GreatOnlineSecurityScan.com will persistently recommend that you purchase the full version of System Security in order to remove the ‘infections’. GreatOnlineSecurityScan.com and its affiliated rogue called ROGUE1 should be deleted immediately.