Decrypted: TaRRaK Ransomware

Avast - 

The TaRRaK ransomware appeared in June of 2021. This ransomware contains many coding errors, so we decided to publish a small blog about them. Samples of this ransomware were spotted in our user base, so we also created a decryptor for this ransomware.

Skip to instructions on how to use the TaRRaK decryptor.

The ransomware is written in .NET. The binary is very clean and contains no protections or obfuscations. When executed, the sample creates a mutex named TaRRaK in order to ensure that only one instance of the malware is executed. Also, an auto-start registry entry is created in order to execute the ransomware on every user login:

The ransomware contains a list of 178 file types (extensions) that, when found, are encrypted:

3ds 7z 7zip acc accdb ai aif apk asc asm asf asp aspx avi backup bak bat bin bmp c cdr cer cfg cmd cpp crt crw cs csproj css csv cue db db3 dbf dcr dds der dmg dng doc docm docx dotx dwg dxf dxg eps epub erf flac flv gif gpg h html ico img iso java jpe jpeg jpg js json kdc key kml kmz litesql log lua

Read More: https://decoded.avast.io/threatresearch/decrypted-tarrak-ransomware/?utm_source=rss&utm_medium=rss&utm_campaign=decrypted-tarrak-ransomware