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An anti-analysis AppleScript to perform evasion tasks from certain consumer-level monitoring and cleanup tools.Ī parent script for gathering the device serial number and for killing all the running processes in the device.A script to ensure persistence for the parent script.Once those embedded scripts were decompiled, the researchers determined the malware uses four methods to execute the run-only AppleScript: The Sentinel Labs team found the malware authors had embedded additional characters to obfuscate its processes.

A script that downloads and sets up XMR-STAK-RX, a free, open-source monero RandomX miner software package.

The researchers say that once the malware has compromised a macOS device, it will seek to kill several processes, including Activity Monitor, which prevents the user from inspecting resource usage. Other security researchers have reported attacks targeting macOS devices to plant cryptominers or other types of malware.Įarlier this month, researchers at Intezer Labs uncovered a campaign using a remote access Trojan dubbed ElectroRAT that had been stealing cryptocurrency from digital wallets on Windows, Linux and macOS platforms (see: ElectroRAT Malware Targets Cryptocurrency Wallets). In December, researchers at Trend Micro uncovered a macOS backdoor variant linked to an advanced persistent threat group operating from Vietnam. The malware used an updated backdoor and multistage payloads as well as anti-detection techniques to help bypass security tools (see: Fresh MacOS Backdoor Variant Linked to Vietnamese Hackers).

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In July 2020, the security firm ESET reported a group of spoofed cryptocurrency trading apps was targeting devices running macOS to install malware called Gmera (see: Malicious Cryptocurrency Trading Apps Target MacOS Users).

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This could be noisy on a production Linux server, but should result in a higher fidelity detection for end user endpoints. MACOS RUNONLY APPLESCRIPTS TO AVOID DETECTION MAC Watch for the creation of new crontab entries. This function uses the built-in cron functionality to add a recurring task to the user’s crontab, allowing the attacker to resume control of the Mac after a reboot or other interrupted connectivity. Once the threat actor has established a remote connection to the victim’s system, they can establish persistence using the “persistence” function in EggShell. Once you have locked in the desired firewall configuration on your endpoints, a default “deny any” rule will prevent users from allowing this type of connectivity when prompted. Using a firewall utility such as LittleSnitch or the built-in Mac firewall with explicit allowances for required traffic stops this callback in its tracks.īelow is an example prompt from LittleSnitch when a connection attempt is made that is not explicitly approved in your configuration. In this case, firewalling may be your best safeguard for this type of threat.

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