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This last month we have seen a new ransomware for Mac. Written in Swift, it is distributed on BitTorrent distribution site as “Patcher” for pirating popular software.

Program: C: Program Files Common Files Adobe TypeSupport PSE18 Unicode Mappings Mac README.TXT This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information. Files with the.readme extension are text documents employed to provide users with helpful information and specific details about certain applications installed in the system. BItsliced Genomic Signature Index BIGSI can index a collection of raw (fastq/bam), contigs or assembly for genes, variant alleles and arbitrary sequence using bit sliced bloom filters. It can scale to millions of bacterial genomes requiring 3MB of disk per sample while maintaining millisecond kmer queries in. Free download page for Project Movie Info Seeker's README.txt.This desktop application synchronizes your movies with information. Saves the movie data locally so you can have access to a movie's information faster and offline. Open the TextEdit app on your Mac (Applications TextEdit, or use Spotlight, press Command-Space bar, to search, find and open TextEdit). TextEdit is a text editing and word processing tool that comes with your Mac. In the TextEdit app, choose File Open. TextEdit has two format modes: (a) plain text (.txt file) and (b) rich text (.rtf file).

Crypto-ransomware has been very popular lately amongst cybercriminals. While most of it targets the Windows desktop, we’ve also seen machines running Linux or macOS being compromised by ransomware in 2016 with, for example, KillDisk affecting Linux and KeRanger attacking OS X.

Early last week, we have seen a new ransomware campaign for Mac. This new ransomware, written in Swift, is distributed via BitTorrent distribution sites and calls itself “Patcher”, ostensibly an application for pirating popular software.

Figure 1 – BitTorrent site distributing Torrent files containing OSX/Filecoder.E

The Torrent contains a single ZIP file – an application bundle. We saw two different fake application “Patchers”: one for Adobe Premiere Pro and one for Microsoft Office for Mac. Mind you, our search was not exhaustive; there might be more out there.

Figure 2 – Icons of the “Patchers” as seen in Finder

The application is generally poorly coded. The window has a transparent background, which can be quite distracting or confusing (see Figure3), and it’s impossible to reopen the window if it is closed.

Readme.txt Download Mac

The application has the bundle identifier NULL.prova and is signed with a key that has not been signed by Apple.

So far, there is no transaction related to the Bitcoin wallet. Which mean the authors have not made a dime from this ransomware. Hopefully this post will raise awareness and keep the wallet’s balance at zero.

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There is one big problem with this ransomware: it doesn’t have any code to communicate with any C&C server. This means that there is no way the key that was used to encrypt the files can be sent to the malware operators.

This also means that there is no way for them to provide a way to decrypt a victim’s files. Paying the ransom in this case will not bring you back your files. That’s one of the reasons we advise that victims never pay the ransom when hit by ransomware.

Alas, the random ZIP password is generated with arc4random_uniform which is considered a secure random number generator. The key is also too long to brute force in a reasonable amount of time.

Interestingly, the email address is an address provided by Mailinator. Mailinator provides a free inbox to anyone without requiring them to register or authenticate. This means it is possible to see the inbox used to communicate with the malware author. We’ve been monitoring this inbox for the last week and didn’t see any messages. However, it’s possible the messages get deleted really fast and we simply missed them.

This new crypto-ransomware, designed specifically for macOS, is surely not a masterpiece. Unfortunately, it’s still effective enough to prevent the victims accessing their own files and could cause serious damage.

There is an increased risk when downloading pirated software that someone is using a dubious channel for acquiring software in order to make you execute malware. ESET recommends that you have a security product installed but the most important precaution in case you encounter crypto-ransomware is to have a current, offline, backup of all your important data.

ESET products detect this threat as OSX/Filecoder.E.