German Cloud Service Provider Hacked

The hosted exchange of the German provider United Hoster suffered a ransomware attack on Saturday (May 20th). "As part of an internal investigation, it was determined that an attacker exploited an unknown vulnerability in Microsoft Exchange to gain access to the Exchange Server," a company spokesman told heise online

United Hoster is building a new Microsoft Exchange environment into which customers will eventually be migrated so that they can receive the full range of functions again. The company does not provide information about the number of affected customers or mailboxes, as this is a business secret. It is also unclear when United Hoster expects to restore services in the new structure. The company spokesman did not specify which Exchange security gap the attackers were able to abuse.

Estimated Cost

hosted exchange offline, services expected to be restored in new MS environment, undisclosed number of customers affected.

Threat Source

Impacts

IT