Bitcoin layer-2 developer Alex Lab suspects the infamous North Korean Lazarus Group is behind the $4 million exploit it suffered in May. The team, along with independent blockchain investigator ZachXBT, linked the hackers to three wallet addresses used to drain funds from the Bitcoin-based DeFi protocol. Despite losing $4.3 million and $13.7 million worth of Stacks (STX) token, some funds were recovered when centralized exchanges froze the exploited funds. Alex Lab offered a 10% bounty for the return of 90% of the stolen funds, but the hackers didn't respond. The ALEX token's value has dropped 47% in the past month.