“If we have 1 Millions $ in our wallet in the next 48 hours, we will not leak this information and also we will not sell it to anybody,” Black Shadow wrote on Telegram.

The Atraf dating site was compromised after the group hacked CyberServe, an Israeli internet service provider whose clients include public transportation firms, museums and a travel company.

On Saturday, the group dumped tens of thousands of records online from the various sites it had penetrated, including 1,000 user profiles from Atraf.