Recently, PeckShield security shield wind control platform DAppShield monitored 3 EOS quiz DApps suffered a new transaction memo attack, a total loss of 12,883 EOS. PeckShield security personnel preliminary analysis believes that the hacker carefully constructs the memo of the bet transaction, causing the game server to parse the abnormality, which will continue to win the prize or cause an abnormal large refund. PeckShield security personnel hereby reminded that developers should conduct security tests before the contract goes online, especially to strengthen the processing of abnormal data. If necessary, they can seek assistance from third-party security companies to help them complete the pre-contract test and basic security defense deployment. .