The agency, which has questioned the Maran brothers more than once in the last few months, issued the attachment order under the provisions of the Prevention of Money Laundering Act (PMLA), ED sources said.
Amongst the assets attached are a huge amount of fixed deposits (FDs) and mutual funds held largely by his brother and Sun TV MD Kalanithi. Some assets of Kalanithi's wife Kaveri have also been attached.
An official order said "that illegal gratification of Rs 742.58 crore was paid by the companies based in Mauritius for Dayanidhi in the two companies namely Ms Sun Direct TV Pvt Ltd (SDTPL) and Ms South Asia FM Ltd (SAFL). These two companies are owned and controlled by Kalanithi. The money has been utilised by the companies in their business or investments.
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The ED probe found that "Kalanithi is holding 75 per cent shares of Ms Sun TV Network Limited and both Kalanithi and his wife have 90 per cent and 10 per cent shareholding respectively in a company Ms Kal Comm Pvt Ltd."
ED registered its criminal case in this deal in 2012 taking cognisance of an earlier CBI FIR.
The CBI had alleged in the court that Dayanidhi had "pressured" and "forced" Chennai-based telecom promoter C Sivasankaran to sell his stakes in Aircel and two subsidiary firms to Malaysian firm Maxis Group in 2006.