![]() The offline key is fixed and security researchers have a way to get it in some cases. The online key and the offline key have a significant difference, which is that the online key is in the hands of criminals and cannot be hacked (obtained) in any way. If the connection to the command server has not been established, then the virus uses a fixed key (so-called ‘offline key’). If this succeeds, the virus sends data about the infected computer to the server, and from it receives a key (so-called ‘online key’) necessary for file encryption. ![]() After that, Tuis virus tries to connect to its command server. Upon execution, the virus creates a directory in the Windows system directory, copies itself to this directory, changes some OS settings, and also collects information about the infected computer. Typically, ransomware like Tuis can infect a computer when installing programs downloaded from torrent web-sites as well as when running cracked games, freeware, Microsoft Windows/Office key generators and other similar software. ![]() Tuis virus sneaks into the system without any visible symptoms, which is why users notice that their computer is infected too late, when the files are already encrypted. ![]() Tuis ransomware is a malware that is created to encrypt files located on the victim’s computer, and then extort money to decrypt them. ![]()
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January 2023
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