Story image

New malware steals passwords from OS X keychain

11 Jul 16

ESET researchers have been investigating a recent case of Mac OS X malware. OSX/Keydnap is reportedly a Trojan stealing passwords and keys out of OS X keychains, while creating a permanent backdoor. 

According to ESET, the OSX/Keydnap backdoor is getting passwords that are stored in OS X's keychain. The sensitive data includes passwords to email and online banking accounts, as well as credit card numbers. 

This is a big deal for OS X users as it poses a major threat to them and their private information. 

Getting to know the Keydnap Trojan

The researchers from ESET have discovered that Keydnap's downloader component is distributed in a .zip file. Once downloaded, or received as an email attachment, the computer user must execute the down loader component within it. 

The .zip archive contains a Mach-O executable file with an extension that looks benign, such as .txt or .jpg. However, the file extension actually contains a space character at the end. This means by double clicking the file in finder, it will be launched in Terminal and not Preview or TextEdit. 

Figure 1: Finder window with the ZIP and the “.jpg ” file

Figure 2: The downloader’s file information window

Keydnap’s downloader will:

  1. Download and execute the backdoor component
  2. Replace the content of the downloader Mach-O executable with a decoy, either using a base64-encoded embedded file or by downloading it from the internet
  3. Open a decoy document (described later)
  4. Close the Terminal window that just opened

At this stage it's not known how many victims there are, or how Keydnap is distributed. 

AlgoSec delivers native security management for Azure Firewall
AlgoSec’s new solution will allow a central management capability for Azure Firewall, Microsoft's new cloud-native firewall-as-a-service.
Kiwis losing $24.7mil to scam calls every year
The losses are almost five times higher compared to the same period last year, from reported losses alone.
How to configure your firewall for maximum effectiveness
ManageEngine offers some firewall best practices that can help security admins handle the conundrum of speed vs security.
Exclusive: Why Australian enterprises are prime targets for malware attacks
"Only 14% of Australian organisations are continuously training employees to spot cyber attacks."
Exclusive: Why botnets will swarm IoT devices
“What if these nodes were able to make autonomous decisions with minimal supervision, use their collective intelligence to solve problems?”
"Is this for real?" The reality of fraud against New Zealanders
Is this for real? More often than not these days it can be hard to tell, and it’s okay to be a bit suspicious, especially when it comes to fraud.
Why you should leverage a next-gen firewall platform
Through full lifecycle-based threat detection and prevention, organisations are able to manage the entire threat lifecycle without adding additional solutions.
The quid pro quo in the IoT age
Consumer consciousness around data privacy, security and stewardship has increased tenfold in recent years, forcing businesses to make customer privacy a business imperative.