Another multi-million dollar rug pull has hit the DeFi space. This weekend, ForceDAO is the victim. 

ForceDAO has suffered a major attack. 

The exploit centers on a bug in the xFORCE contract’s code, which allowed anyone to call the “deposit” function regardless of whether they were holding FORCE tokens. That meant it was possible to mint xFORCE tokens from the contract without locking any tokens in the vault.

Anyone could then exchange these tokens for FORCE by calling the “withdraw” function in the contract. 

Several attackers took advantage of the exploit earlier this morning. One of them took about 14.8 million FORCE, which had a notional value of around $34 million at the time. They’ve since returned the funds to the pool.

However, four others drained another 6.75 million tokens and have begun exchanging their takings for ETH on various exchanges. As the white hat attacker had already found the exploit, liquidity plunged, which meant every subsequent attacker earned significantly less for their FORCE. 

Mudit Gupta, blockchain team lead at Polymath Network, detailed the attack in a tweetstorm.   

xFORCE contract from @force_dao hacked and drained by a whitehacker. In the FORCE token, the transfer functions return false rather than reverting when the sender doesn't have enough balance. The xFORCE contract assumes FORCE will revert and does not handle the returned value. pic.twitter.com/lPo9vJ48bs

— Mudit Gupta (@Mudit__Gupta) April 4, 2021

ForceDAO organized a highly anticipated airdrop yesterday, in which FORCE tokens were distributed to active Ethereum users. It was trading at around $2.30 earlier this morning but has since plummeted. At one point, it was down 95% and is now worth around $0.26. 

One of the black hat attackers used an address linked to the centralized exchange FTX, which gives some hope that the funds may be recovered. Most of the rest, though, has already been sold through the decentralized exchanges 1inch and SushiSwap. 

ForceDAO took to Twitter to confirm the attack. According to the team, a post-mortem will follow. 

ATTENTION

Our team is aware of the xFORCE contract exploit and has identified the nature of the issue.

There are no further funds available on the xFORCE contract to be exploited.

All other vaults are safe.

We will provide a post-mortem and next steps over the coming hours.

— Force (@force_dao) April 4, 2021

This is a developing story and will be updated as further details surface.

Disclosure: At the time of writing, the author of this feature owned ETH and several other cryptocurrencies. They also had exposure to SUSHI in a cryptocurrency index. 

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