07/25 Update added below. This post was originally published on July 22nd, 2020.

Hundreds of unsecured databases exposed on the public web are the target of an automated ‘meow’ attack that destroys data without any explanation.

The activity started recently by hitting Elasticsearch and MongoDB instances without leaving any explanation, or even a ransom note. Attacks then expanded to other database types and to file systems open on the web.

A quick search by BleepingComputer on the IoT search engine Shodan initially found dozens of databases that have been affected by this attack. Recently, the number of wiped databases increased