Apparently a South Korean exchange called Good Cycle is behind the 2 recent Ethereum transaction that cumulatively involved 5 million $ in fees, claim PeckShield Inc. a blockchain security company that have posted this tweet:
They have been reportedly hacked several times as a result of the major security inefficiencies including using HTTP and not HTTPS.
Good Cycle website had reportedly an announcement on their website admitting that with the Google translate text below:
Additionally they have sent 2 transaction to both Ethereum mining pools Ethermine and SparkPool involved in mining the unusual transactions say "I am the Sender":

Just to recap - 2 mysterious transaction happened on 10th and 11th of June this year where in total 5 million $ where sent in gas fees:


Both of the mining pools - Ethermine and SparkPool where to decided to divide the gas fees among the miners involved in mining the blocks, but because the Good Cycle has contacted the via messages in the new transactions, we are still to see what will happen now.
The question remain though - Who were behind the hack ?
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