![]() While Macs have fewer threats there are fewer prior tests on which to base test methodology, so establishing sound mainstream testing is trickier than your might think, not least because so few people have experience of it. #Macos malware years runonly to detection softwareīut as both Macs and Mac malware increase in prevalence, the importance of testing software that’s intended to supplement the internal security of OS X increases, too. That’s what it says in the abstract for our recent Virus Bulletin paper, but that’s because it happens to be what we think. Of course, we encourage you to read the paper – Mac Hacking: the Way to Better Testing? But this is the first article in a blog series, based on the presentation rather than directly on the paper, giving a more concise summary of our views. We’re not about to give an airing to the usual fanboi ‘Windoze bad, OS X impregnable’’ stuff. #Macos malware years runonly to detection codeīut compared to the hundreds of thousands of Windows-targeting samples ESET’s lab sees on a daily basis, the total number of unique OS X samples is tiny.#Macos malware years runonly to detection software.#Macos malware years runonly to detection full. ![]() See Also: OnDemand | Zero Tolerance: Controlling The Landscape Where You'll Meet Your Adversaries Sentinel Labs researchers have identified an updated version of the cryptominer OSAMiner that targets the macOS operating system to mine for monero. ![]() The latest iteration uses new techniques to help prevent detection by security tools, the researchers report. OSAMiner, which has been active since 2015, has been distributed through hacked video games, such as League of Legends, as well as compromised versions of software packages, including Microsoft Office for macOS, Sentinel Labs says. The malware now uses multiple versions of AppleScript - a scripting language used in macOS devices - to support obfuscation. OSAMiner's operators released the latest version of the cryptominer in 2020, but researchers only recently discovered the enhancements, according to the researchers' report. "In late 2020, we discovered that the malware authors, presumably building on their earlier success in evading full analysis, had continued to develop and evolve their techniques," says Phil Stokes, a threat researcher at Sentinel Labs. "Recent versions of macOS.OSAMiner add greater complexity by embedding one run-only AppleScript inside another, further complicating the already difficult process of analysis." Security Evasion #Malware used runonly applescripts avoid for full OSAMiner uses run-only AppleScripts to make reverse-engineering of its code difficult, the researchers say. To decompile the malicious malware scripts, Sentinel Labs researchers had to use a relatively lesser-known AppleScript-disassembler project and another custom tool developed by the security firm. #Malware used runonly applescripts avoid for serial numberĪ 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.
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