Ransomware is a form of malware which encrypts files on anything from a single computer all the way up to an entire network, including servers, so that the files cannot be accessed without a decryption key. The attackers then ask for payments in cryptocurrency to provide targets with the decryption key, usually within a short time frame to put more pressure on the targets. This is a very dangerous type of malware, as it can lead to critical damage to an entire information system. The system can be restored from backups, but the administrators should first check for any remaining traces of ransomware. In addition to encrypting files, the attackers can also employ data exfiltration techniques to steal data and threaten to publish them in case they don’t receive their payment.