The FBI has discovered six Bitcoin wallets linked to the North Korean government-backed hacking team Lazarus, Cointelegraph reports. The six wallets contained 1,580 Bitcoins worth $40 million, believed to be the proceeds of various cryptocurrency hacks over the past year.

The FBI is warning cryptocurrency companies that financial flows linked to the notorious North Korean hacking team could be a sign they are looking to sell. The federal investigative agency recommended that cryptocurrency companies keep a close eye on the six Bitcoin wallets and use blockchain data to track any movement of funds.

North Korean hacking teams have been actively involved in multiple cryptocurrency-related attacks over the years, stealing billions of dollars worth of crypto assets. A recent report from TRM Labs revealed that North Korean hackers have stolen nearly $2 billion in cryptocurrency since 2018. The team was most active in 2022, stealing nearly $1 billion in crypto assets last year alone.