Rhonda J. Holmes told the New York Post that at least $30 million in cash has gone missing, while up to $500 million of real estate has been "bought, flipped and used to launder money".
Holmes said: "I have never seen such greed and moral turpitude. This case is going to make Bernard Madoff look warm and fuzzy.
"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."
She added: "She hired private investigators, accountants and me. We are also working with local and federal authorities.
"Many of those [involved with] the estate's coffers mismanaged, stole and outright looted it shamelessly."
Holmes said that civil cases would be filed within the next month and that any properties recovered would be donated to those who have recently lost their homes.
Earlier this year, Love said that royalties from Nirvana records were going "to a handful of Jew loan officers, Jew private banks" and "lawyers who are also bankers".