The virus also saves two text files on the victim’s computer that provide attack-related details – the victim’s public encryption key and personal ID. It is evident that by restricting specific domains, the crooks are trying to prevent the victim from reaching relevant and helpful ransomware-attack-related information online. We noticed that ransomware attempts to block websites that publish various how-to guides for computer users. As a result, the victim will run into a DNS_PROBE_FINISHED_NXDOMAIN error when accessing one of the blocked websites. In addition, the crooks modify the Windows HOSTS file by adding a list of domains to it and mapping them to the localhost IP. The thing is, ransomware operators are getting rid of any Windows OS-based methods that could help the victim to restore files for free. Once deleted, it becomes impossible to restore the previous computer state using System Restore Points. Next, the ransomware deletes Volume Shadow Copies from the system using the following CMD command: vssadmin.exe Delete Shadows /All /Quiet

However, at the same time, the ransomware runs another process (usually named by four random characters) which starts scanning the system for target files and encrypting them.

This is meant to convince the victim that a sudden system slowdown is caused by a Windows update. One of the first ones being launched is winupdate.exe, a tricky process that displays a fake Windows update prompt during the attack. Jypo ransomware arrives as a set of processes that are meant to perform different tasks on a victim’s computer. _readme.txt (STOP/DJVU Ransomware) – The scary alert demanding from users to pay the ransom to decrypt the encoded data contains these frustrating warnings

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