The emails appeared to announce airdrops and exclusive offers from those companies, and recipients were invited to connect their wallets to claim tokens. Those wallets were then drained.
The attackers stole a variety of cryptocurrencies, and some outlets have reported the theft has totalled more than $3.3 million. However, because a substantial amount of that number comes from the illiquid Xbanking token, the actual liquid value of the tokens is likely closer to $700,000. The attackers have begun mixing the stolen funds through the Railgun privacy service.