The attacker requests payment in Bitcoin. The MafiaWare666 ransomware displays a window with instructions detailing how to pay the ransom. Files held hostage are appended with one or all of the following. MafiaWare666 searches specific folder locations (Desktop, Music, Videos, Pictures, and Documents) and encrypts numerous file extensions like 7z, Bat, DivX, HTML, JPEG, JPG, MP3, MP4, ZIP, and everything in between for the most part. It is likely that new or unknown samples may encrypt files differently, making them decryptable without further analysis. Avast researchers found a vulnerability in the encryption schema that allows some of the variants to be decrypted without paying the ransom. MafiaWare666 encrypts files using AES encryption. The file “!!! READ THIS - IMPORTANT !!!.txt” contains the following ransom note seen in the screenshot below.The MafiaWare666 ransomware strain is written in C# there aren't any obfuscation or anti-analysis techniques. Several variants of this ransomware use the Jigsaw Killers picture in the ransom screen, making it easier to spot. Additionally, the ransomware creates a key file with name similar to: #9C43A95AC27D3A131D3E8A95F2163088-Bravo _ni_0day in C:ProgramData folder. Avast Decryption Tool for Jigsaw can unlock Jigsaw, a ransomware strain thats named after the movie character 'The Jigsaw Killer.' All the Avast Decryption Tools are available in one zip here. In each folder with at least one encrypted file, the file "!!! READ THIS - IMPORTANT !!!.txt" can be found. The ransomware adds one of the following extensions to encrypted files: AES_NI uses AES-256 combined with RSA-2048. There are known multiple variants with different file extensions. All the Avast Decryption Tools are available in one zip here. Avast Decryption Tool for AES_NI can help decrypt the AES_NI ransomware strain. Download Avast Decryption Tool for Troldesh 1.0.0.688 - A dedicated decryption tool for the Troldesh ransomware, also known as Shade or Encoder.
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