The central probe agency's office here issued a provisional attachment order under sections of the Prevention of Money Laundering Act (PMLA).
The attached assets include six hotels in Assam, Bihar and West Bengal, a 17-acre amusement park in Tripura, a prime commercial space in Kolkata, some other land properties in other states and three flats in another posh area of the West Bengal capital.
"The latest attachment order is on assets worth Rs 293 crore (market value)," a senior official in the agency said.
The Enforcement Directorate (ED) had registered a criminal FIR against the firm, its chairman Gautam Kundu and others in 2014 under the PMLA.
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Kundu was arrested by the agency from here in March, 2015, and he is currently in judicial custody.
Multiple charge sheets have been filed in the courts in Kolkata and Bhubaneswar by the ED in this case.
The group had allegedly floated 27 companies for running the alleged chit fund operations out of which only half-a- dozen were active.
It is alleged that the firm had floated the scheme by promising inflated returns between 8 and 27 per cent on investments to gullible investors in various states.
The company had allegedly promised astronomical returns to depositors on land properties and assets and bookings done in the real estate sector.
It is alleged the company had made "cross investments" in its various sister firms to suppress its liabilities towards investors.
The ED has pegged the total volume of the alleged irregularities at Rs 8,600 crore.
An attachment order under the PMLA is aimed at depriving the accused from getting benefits of their ill-gotten wealth and it gets confirmed after an order is passed by the Adjudicating Authority of the said Act.