The sample exploits the ETERNALBLUE SMB vulnerability or DOUBLEPULSAR backdoor for propagation and infection of the ransomware. The sample first connects to the domain name http://www.iuqerfsodp9ifjaposdfjhgosurijfaewrwergwea.com, to test network connectivity. If the network is reachable, the sample exits; otherwise, the sample carries out subsequent behaviors. Therefore, a reachable domain name can be registered to stop further attacks.
On November 27 (Sunday), at around 17:00 (local time), Deutsche Telekom was hit by a cyberattack, resulting in more than 900,000 routers getting disconnected, as confirmed by the company. The outage lasted several hours. Later, the problems continued on Monday morning from 08:00. Besides network access, the affected routers are used by Deutsche Telekom customers for fixed telephony and TV services.