Avast now offers ransomware victims 20 free decryption tools to help them get their files back.
A little less than a year ago, we started providing free decryption tools for victims of ransomware attacks. Today we're pleased to announce that we've just released our 20th free ransomware decryption tool: a free decryption tool for the EncrypTile ransomware. We've also updated a few of our older decryption tools, including AES_NI, BTCWare, CrySiS, Crypt888, and XData.
We first spotted a test version of EncrypTile in October 2016. Six months after its initial release, the ransomware now has a user interface and support for multiple languages (although the language translations are very poor). The ransom note is shown in the EncrypTile main window, as well as in the newly created desktop wallpaper.
The ransomware also adds the word “EncrypTile” into the file name:
After the files are encrypted, the ransomware creates 4 new files on the user’s desktop. The names of these files are localized. Below is an example of the English version.
The ransomware also creates an auto-start entry, both for the current user and for all users of the computer:
EncrypTile has a list of whitelisted process names, and anything not on the list is auto-killed when detected. This prevents the user from running any security or diagnostic tools.
Equals to: csrss, dllhost, winlogon, explorer, conhost, vbc, dwm, lsm, svchost, services, smss,
spoolsv, system, wininit, wmpnetwk, lsass, sppsvc, chrome, firefox, iexplore, opera, idle, audiodg, encryptile, notepad, mspaint, printisolationhost, powerpnt, osk, acrord32, imagingdevices, mspscan, wmplayer, wscntfy, userinit, schtasks, magnify, browser, cmd, wuauclt
Contains: search, wallet, bitcoin, multibit, word, calc, microsoftedge
Has the name equal to the current (ransomware) process
An interesting effect of the above feature occurs with the Admin Approval mode. The ransomware kills the “consent.exe” process, the pop-up window that allows Windows users to approve or decline changes a program wants to make the computer. As a result, no administrator access can be granted and the user is stuck in the Admin Approval mode, unable to carry out any actions as the administrator.
To prevent detection, the ransomware executable is invisible while it is running.
While running, the ransomware actively prevents the user from using any tools that may potentially remove it. Because of this, it is necessary to follow the steps below to successfully remove and decrypt the infected files:
I would like to thank my colleague Ladislav Zezula for preparing this decryption tool.
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