This message is in a file called ‘_readme.txt’. This is reported by the authors of Tisc virus, in a message that they leave on the infected computer. To decrypt it, you must use the key and the decryptor. wpsĪs we said, ‘Tisc file’ is an encrypted file. Thus, the following types of files can be encrypted: The ransomware only does not encrypt files in the OS system directories, files with the extension. No matter where the file is located, on the internal drive or network storage, this file will be encrypted. Each file on the victim’s computer becomes the target of the Tisc virus. This means the following, if the file was named ‘document.docx’, then after it is encrypted, it will be called ‘’.

Each file that has been affected by the virus is renamed in such a way that the ‘.tisc’ extension is added to its old name on the right. Tisc file is a file that has been encrypted by the Tisc ransomware and therefore the contents of this file are locked. This gives hope that the ransomware victims will be able to decrypt files without paying ransom.

The offline key is fixed and can be determined by security researchers.

The main difference between an online key and an offline key is that the online key is in the hands of criminals and cannot be determined. 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 on the infected computer to the server, and from it receives a key (so-called ‘online key’) necessary for file encryption. After that, Tisc 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 Tisc can infect a computer when installing programs downloaded from torrent web-sites as well as when running cracked games, freeware, key generators and other similar software. Tisc 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.

Tisc ransomware is a malware that’s created to encrypt files located on the victim’s computer, and then extort money to decrypt them. Screenshot of files encrypted by Tisc virus (‘.tisc’ file extension) QUICK LINKS

How to decrypt a file windows 10