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CrossRAT can manipulate the file system, take screenshots, download and execute additional files.

When executed, the malware will try to copy itself to /usr/var/mediagrs.jar if it has permissions, and in case it fails will copy to %HOME%/Library/mediamgrs.jarThe malware creates LaunchAgent вЂњ$HOME/Library/LaunchAgents/istвЂќ for persistence on the infected machine.

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If macros are enabled, a malicious code will be executed to download and infect the system. The infection vector is through a malicious document that arrives in a phishing campaign. There are signs that imply that the malware was developed by/for the Dark Caracal APT group. Tearing Apart the Undetected (OSX)Coldroot RATД¬rossRAT is a cross platform malware written in Java, targeting Windows, Linux and MacOS.

In addition it will modify the system security database file TCC.db to add itself as Accessibility application, meaning it will then have the ability to control the computer. The malware keep its configuration within a file in its application bundle (вЂњMacOS/conx.wolвЂќ). It will create a LaunchDaemon in order to persist system reboot (вЂњ/Library/LaunchDaemons/.plistвЂќ).

Once executed, the malware will try to get root access via popping a window asking the user for credentials. вЂ“ KeyloggingThe malicious application arrives with a normal вЂњdocumentвЂќ icon, so a user might think he is opening a document rather than a malicious application. вЂ“ Gain accessibility rights by modifying TCC.db The malware is weaponized with a wide range of commands such as:- File/Folders control (move, reanme, delete)

Mac cryptocurrency ticker app installs backdoorsД¬oldroot was first published as an open source RAT for macOS on Github on 2016, but no real malware was discovered until 2018.

This LaunchAgent is actually a payload to download and execute the backdoor:ДЄs the additional malware was downloaded from github, the user and all its content no longer exists. To persist with a system reboot, the malware creates a LaunchAgent вЂњ~/Library/LaunchAgents/.istвЂќ (note that the LaunchAgent file is hidden by default since its start with вЂњ.вЂќ) as it starts with the command вЂњlaunchctl loadвЂќ. The additional downloaded malware will open a reverse shell connection to its Command & Control server. CoinTicker downloads two additional back doors The first is a custom version of EggShell malware and the other is EvilOSX by using the curl command: However, in the background the malware downloads and executes additional malware from the internet. вЂ“ Create a LaunchAgent to start itself automatically on system rebootThe malware has also unfinished/unused functionality that includes:- Loading/unloading kernel extensions that handles USB devicesД¬oinTicker appears to be a legitimate program that displays information on cryptocurrency coins such as Bitcoin, Etherium, Ripple etcвЂ¦ вЂ“ Copy itself to вЂњ/System/Library/CoreServices/launchb.appвЂќ вЂ“ Enable remote login to the system / Activate Apple Remote Desktop

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вЂ“ Modify TCC.db to make malware application bundle as вЂњAssistive AccessвЂќ, means the malware will have accessibility rights without the need for password вЂ“ Save user name and password into ~/.calisto/cred.dat вЂ“ Save computer IP address into ~/.calisto/network.dat

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The malware then will execute a bash command to achieve the following:- Zip ~/Library/Keychains folder into the file ~/.calisto/KC.zip When executed, the malware will pop a window asking for the userвЂ™s credentials, to gain root access: Iit can also open a backdoor so the attacker will be able to connect to the system remotely, take screenshots and more.It propagates as fake вЂњIntego Mac Internet SecurityвЂќ as we can see from the differences shown in the pictures below (taken from original report): Calisto is a Trojan that steals sensitive data from the infected machine such as user passwords, Keychain data and Chrome.

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