To take precautions against malware such as WannaCry, data encryption and backup as well as regular updates are essential.
Data encryption

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Data encryption instead of WannaCry

In the era of the digital transformation, the Internet is omnipresent: whether it be with a desktop computer, laptop or smartphone, digital communication, administration and information are now taken for granted. At the same time, our dependency and vulnerability are increasing. With cyber crime, theft has achieved an entirely new dimension and if there are weaknesses in the technology, these can be exploited. T-Systems shows how you can secure and encrypt your data and thus help to prevent attacks.
Dr. Ulrich Lessmann
Dr. Ulrich Lessmann

Expert for Cyber Security

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WannaCry malware – do not be blackmailed, take precautions!

In light of the latest global cyber attack on Windows systems with the WannaCry malware, the issue of cyber security has never been so explosive. After all, the technology that we rely on every day – whether it be in traffic, in hospitals or at work – has security flaws. Weaknesses like these allowed blackmailers to infiltrate computers with WannaCry. The malware encrypts files on the system, rendering them unusable.
The malware is spread via e-mail. Once it has infiltrated a system – for example a company network – the software infects unpatched server and workplace systems. This is why it is so important to take precautions!

How can I protect myself?

  • Look very carefully at the e-mails that you receive before opening them and make sure that they are from people whom you trust.
  • If an e-mail seems suspicious, do not open any file attachments.
  • Be particularly careful with e-mails allegedly containing invoices or Office files which are often used to distribute Trojans.
  • Always keep your operating system, browser and all other programs that you use up to date.
  • Regularly back up your data on an external storage medium such as a hard drive, a USB stick or using a cloud storage facility that you trust.​​​​​​​
  • Do not keep this storage device connected to your computer at all times.
  • In the event of an infection with an encryption Trojan, data and system backups are often the only way to restore the affected files and systems and to avoid further damage.

No WannaCry with workplaces from the cloud


Cloud workplaces are patched centrally by T-Systems in the data center – there is no need to spend lots of time rolling out new anti-virus software to physical client systems.

In addition, user data are separate from the client system in cloud workplaces. Malware on the client which attacks system data can be removed simply by restarting the client. This takes just three minutes.

In the interview, Thomas Tschersich, head of internal security and cyber defense at Deutsche Telekom, talks to Alexia Sailer about WannaCry and how to take precautions against such attacks.

Articles from Perspective Security

As far as is known, no Deutsche Telekom systems in Germany or abroad have been affected. There have also been no reports of customer systems managed by Deutsche Telekom being infected.
Deutsche Telekom, 2017
Nach aktuellen Kenntnissen sind bisher keine Systeme der Deutschen Telekom im In- und Ausland betroffen.

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