ZachXBT identified another $27 million in exchange withdrawals, some of which occurred after he first flagged the suspected crypto theft.

Blockchain investigator ZachXBT has raised his estimate of a suspected crypto theft from an unidentified European Union entity to more than $133 million.

On Tuesday, ZachXBT said he identified another $27 million in withdrawals from centralized exchanges, increasing the suspected losses from the $106 million he initially reported on Monday. He said some withdrawals occurred after his primary disclosure.

“My working theory is a large financial institution in Western Europe was exploited and it’s currently being covered up,” ZachXBT said Tuesday on his Telegram channel.

He also said that the lack of a proper incident disclosure allowed more than $30 million to be laundered, claiming EU law enforcement could otherwise have frozen the funds. The victim’s identity and allegations of a cover-up remain unverified.

Bitquery reported that $62.98 million in stablecoins was converted into 27,553 Ether (ETH) within roughly four hours. As of 13:47 UTC Monday, approximately $78.3 million remained in wallets linked to the suspected attacker, while $30.5 million had moved out of the tracked addresses.

Only $3.74 million remained in USDC that issuer Circle could potentially freeze, according to Bitquery.

ZachXBT said earlier that the attacker was swapping funds into ETH and Monero (XMR) through instant exchanges and cross-chain bridges. He added that the laundering patterns did not match those typically used by North Korea’s Lazarus Group.

Related: North Korea denies role in $6.3B Binance hack, points finger at US

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