About 26,000 MongoDB databases were wiped in a cyber attack carried out by three groups of hackers recently , who demanded between 0.05BTC and 0.15BTC ( around $ 100 ) to restore the database . The victims who Gevers has been able to help asked him to log in into their servers remotely and even, in few cases, perform a restore or hardening. According to Victor Muller , who runs Netherlands - based non - profit security group GDI Foundation , an estimated 99 % of the 21,000 MongoDB unsecured instances have been hacked , with more than 100 victims . The attacks began last December and in January , MongoDB warned users in an advisory to deploy protection , but the message appears to have been ignored .
About 26,000 MongoDB databases were wiped in a cyber attack carried out by three groups of hackers recently , who demanded between 0.05BTC and 0.15BTC ( around $ 100 ) to restore the database . According to Victor Muller , who runs Netherlands - based non - profit security group GDI Foundation , an estimated 99 % of the 21,000 MongoDB unsecured instances have been hacked , with more than 100 victims . The attacks began last December and in January , MongoDB warned users in an advisory to deploy protection , but the message appears to have been ignored .