Tutorials

Useful tutorials on various PC troubleshooting topics. Video tutorials.

How to remove Cr1ptT0r Ransomware and decrypt your files

Cr1ptT0r Ransomware is new type of ransomware, that uses network disk array vulnerability to infect user's computers. This crypto ransomware encrypts data on network (cloud, NAS, Network Attached Storage) storage using a special encryption algorithm, and then requires a ransom of ~ 0.3 BTC to return files. Original title Cr1ptT0r is indicated in the ransom note and on the page on the OpenBazaar website. Developers call themselves a Cr1ptT0r team. The ELF ARM binary is used for Linux systems with a focus on embedded devices, but depending on the manufacturer it can be adapted for Windows. Virus creates 2 files: _FILES_ENCRYPTED_README.txt and _cr1ptt0r_support.txt. The Sodium crypto library and the asymmetric encryption algorithm "curve25519xsalsa20poly1305" (Curve25519, Salsa20, Poly1305) are used for encryption. The open 256-bit encryption key is located in the cr1ptt0r_logs.txt file, which also stores the list of encrypted files, and it is also added to the end of the encrypted files, just before the marker. Cr1ptT0r Ransomware uses the OpenBazaar site to "support" the affected and selling the decoder. There are no decryption tool available yet, however, using instructions in this article can help you recover encrypted files. Follow the guide below to remove Cr1ptT0r Ransomware and decrypt your files in Windows 10, 8/8.1, Windows 7.

How to remove STOP Ransomware and decrypt .adobe or .adobee files

This particular sample of Adobe Ransomware is, in fact, a continuation of STOP Ransomware family. This virus attacks files, that can be important for average user, like documents, photos, databases, music, enciphers them with AES encryption and adds .adobe (one "e" in the end), .adobee (two "e"s in the end) extensions to affected files. This creates a mess, because there are several different ransomware families using this extension after encryption. All these viruses use different algorithms, however .adobe files encrypted by STOP Ransomware can be deciphered using STOPDecrypter (provided below). Unlike previous versions, this one gives clear information about the cost of decryption, which is $980 (or $490 if it is paid within 72 hours). However, this is just a trick, to encourage people to pay the ransom. Often authors of the ransomware don't send any decryptor. We recommend you to remove executables of STOP Ransomware and use decryption tools available for .adobe files.

How to remove GandCrab v5.2 Ransomware and decrypt your files

GandCrab v5.2 Ransomware was released just few hours before Europol, Romanian Police and Bitdefender released full-functional decryption tool for all previous versions of virus, up to GandCrab v5.1 Ransomware. Updated version of GandCrab adds .[5-6-7-8-9-10-random-letters] extension and ransom note file will get such name: [5-6-7-8-9-10-random-letters]-DECRYPT.txt and [random-letters]-DECRYPT.html. It is reported that many IT companies and managed service providers have been infected and affected by the GandCrab Ransomware. Some of the previous versions had decryptor from BitDefender, we will provide download link for this tool below. There is a possibility, that program will be updated to work with GandCrab v5.2 Ransomware. Meanwhile, we recommend you to use standard Windows functions, such as shadow copies, previous versions of files, restore point to attempt recovering your files. Using special file-recovery software often helps to restore many files, remover by the user earlier and not touched by the virus.

How to remove Dharma-ETH Ransomware and decrypt .ETH files

Dharma-ETH Ransomware is new generation of high-risk Crysis-Dharma-Cezar ransomware family, particularly, its Dharma variation. It was named after the extension it appends to encrypted files: .ETH. In fact, virus adds complex suffix, that consists of several parts: e-mail address, unique 8-digit identification number (completely random) and .ETH extension. In the end, affected files get complex suffix, that looks like this - .id-{8-digit-id}.[{email-address}].ETH. Ransom notes do not contain information about the amount users need to pay to return the files. There is also no information about encryption algorithms it uses. However, from the experience of previous infections of this type, we can say it, probably, uses AES or RSA-2048 encryption and will try to rip you off on a sum from $500 to $1500, that have to be paid in Monero, Dash or BTC (BitCoins).

How to remove Dharma-KARLS Ransomware and decrypt .KARLS files

Dharma-KARLS Ransomware is new virulent file-encryption threat, built on well-known platform of Crysis-Dharma-Cezar ransomware family. Unlike other variations, this version adds .KARLS extension to encrypted files. Actually, Dharma-KARLS Ransomware creates complicated appendix, that consists of unique user id, developer's e-mail address and .KARLS suffix, from which it got its name. The template of filename modification looks like this: file called 1.doc will be converted to 1.doc.id-{8-digit-id}.[{email-address}].KARLS. Authors of Dharma-KARLS Ransomware can extort from $500 to $5000 ransom in BTC (BitCoins) for decryption. Using cryptocurrency and TOR-hosted payment websites makes it impossible to track the payee. Besides, victims of such viruses often get scammed, and malefactors don't send any keys even after paying the ransom. Unfortunately, manual or automatic decryption is impossible unless ransomware was developed with mistakes or has certain execution errors, flaws or vulnerabilities.