The company said in a post that the attackers had gained access to the private key of the owner of the KickCoin smart contract, but did not specify how this had occurred.
The theft came to light when a number of users complained that their tokens had gone missing – to the time of about US$800,000.
Investigations showed that about 70 million KickCoins had been purloined. At the existing exchange rate, those coins are worth about US$7.7 million.
"In result, the total number of tokens in the network has not changed. But thanks to the rapid response of our community and our co-ordinated team work, we were able to regain control over the tokens and prevent further possible losses by replacing the compromised private key with the private key of the cold storage."
The company said the theft came to light on 26 July.