Ransomeware, viruses

Ransomware and viruses are examples of so-called malware. All devices connected to the university network must be free of malware. If an infected device is detected, the device and the operator's account will be blocked to protect the infrastructure and data of the university and its members.

Malware can basically be contained in any file. It is particularly common to find it in Office files, recently also in OneNote files or meeting schedules (.ics).

Ideally, the malware scanner (formerly virus scanner) of your device, e.g. Microsoft Defender, detects malware. As a result, the malware is removed and a corresponding message is displayed on the desktop.

If malware is not detected by the malware scanner, detection is much more difficult. Indications can be:

  • Device is slower from one day to the next.
  • Your data media is constantly accessed (LED is always on).
  • Your data is suddenly encrypted (ransomware).
  • Strange web pages or messages suddenly open.
  • The firewall of your device or router reports unusual access attempts.
  • Logins to websites that are not yours.
  • Lots of strange emails / undeliverable messages in your inbox.
  • Information that was stored only on your device suddenly appears on the Internet.

The following aspects help protect your devices:

  • Operating system and software are up-to-date: Only operating systems and software that are supported and maintained by the manufacturer are on your device.
    • Upgrades: If a newer version is available for your operating system, install the upgrade as soon as it reaches a certain level of stability or maturity. For mobile devices in particular, an upgrade often only comes with the purchase of a new device.
    • Updates: Activate autoupdates or install esp security updates promptly.
    • Legal software, downloads: Use licensed software. So-called cracks almost always contain malware and can damage or even destroy your device. Dubious websites that offer the above-mentioned software or e.g. copyright-protected media illegally often distribute malware.
    • Mobile data carriers: If you are offered (media) files via an unknown data carrier (USB stick or hard disk, SD card), remember that malware can also be transferred via the data carrier (walk-in worms).
  • Virus scanner: Use a malware scanner whenever possible.
  • Drive-by infection: Avoid unsafe websites (red browser warning, disabled links) and websites with a lot of advertising.

(Translated with DeepL.com/Translator​)