The attacker has finally begun laundering the stolen funds after more than three years of inactivity.
In January 2023, the attacker swapped the stolen GMX for 2,819 ETH, worth $3.4M at the time. Due to ETH's price appreciation, those funds are now worth $4.4M.
The assets remained dormant until a few minutes ago, when the attacker deposited the stolen ETH into Tornado Cash in 28 of 100 ETH each.
Stay smart.
