Big business is being targeted by cyber-criminals in “ransomware” attacks, threatening deletion or freezing of crucial business files unless money is paid. A new national survey of Australian big business reports that in September last year, 25 organisations reported ransomware attacks. Releasing the 2012 Cyber Crime and Security Survey Report in Melbourne, Attorney-General Mark Dreyfus says businesses were at times reluctant to report the attacks, which were linked to organised crime.