Courtney Love says the $360 million Kurt Cobain left her and the couple's daughter, Frances Bean, after his death in 1994 has been lost, presumed stolen.

Private investigators, lawyers and forensic accountants hired by Love found that the majority of the money has been fraudulently invested into real estate by unidentified people using Cobain's, Love's and Frances Bean's social security numbers.

"I have never seen such greed and moral turpitude. This case is going to make Bernard Madoff look warm and fuzzy," she said, referencing the disgraced US financier who is facing prosecution for fraud.

"We will be filing civil cases...within the next 30 days. There are many, many millions missing. We've only been able to track down $30 million, but there is more. And then there is the real estate."

Love did not realize the money was missing until it was too late.

"Courtney noticed the money was gone when there wasn't any left. It's no secret she struggled with substance abuse issues, but in the last year she's taken a more serious approach to sobriety, and started noticing things were wrong."

After his death in 1994, Cobain's estate was left to Love, Frances Bean, his mother, two sisters and brother.