However, the crypto miner did not completely avoid detection. Back in 2018 August and September, two Chinese security firms analyzed an older version of the Malware. However, the reports written after this were not very detailed and did not capture the full extent of OSAMiner’s capabilities. The reason was that the researchers were unable to retrieve the malware’s full code. #MACOS MALWARE YEARS RUNONLY APPLESCRIPTS DETECTION FULL# It used nested run-only AppleScript files to retrieve its malicious code across different stages at the time. When the users installed their pirated software, the disguised installers would download and run a run-only AppleScript. It would then download and run a second run-only AppleScript and then run another third/final one.īecause the run-only AppleScript is received in a compiled state (the source code is not readable by humans), security researchers’ analysis was not easy. #MACOS MALWARE YEARS RUNONLY APPLESCRIPTS DETECTION CODE# Phil Stokes, a macOS malware researcher at SentinelOne, published the attack’s full-chain with past and present OSAMiner campaigns and IOCs (Indicators of Compromise). The hope for this team of researchers is that they can crack the mystery around this clever malware. #MACOS MALWARE YEARS RUNONLY APPLESCRIPTS DETECTION CODE#.#MACOS MALWARE YEARS RUNONLY APPLESCRIPTS DETECTION SOFTWARE#.#MACOS MALWARE YEARS RUNONLY APPLESCRIPTS DETECTION FULL#.Threat actors behind the XCSSET malware have been relatively quiet since last year, but new activity beginning around April 2022 and increasing through May to August of this year shows the actors have not only adapted to changes in macOS Monterey but are preparing for the demise of Python, an integral and essential part of their current toolkit. 'Run-only AppleScripts are surprisingly rare in the MacOS malware world, but both the longevity of and the lack of attention to the MacOS.OSAMiner campaign, which has likely been running for at. In this post, we review changes made to the latest versions of XCSSET and reveal some of the context in which these threat actors operate. macOS malware used run-only AppleScripts to avoid detection for five years by TheCyberPost1 in MacOS sakrist 2 points 3 points 4 points 9 months ago (0 children) This is so wrong assumption that Apple is going to remove AppleScript because some people download pirated applications. Since XCSSSET first appeared, the authors have made consistent use of two primary tools to obfuscate both droppers and dropped files: SHC and run-only compiled AppleScripts, respectively. #Years used runonly applescripts detection for download# SHC-compiled shell scripts are opaque to traditional static scanning tools and contain only a few human-readable strings.Īs all SHC-compiled binaries, legitimate or malicious, contain these same strings, signature scanners cannot distinguish between them. SHA1: 127b66afa20a1c42e653ee4f4b64cf1ee3ed637dĭynamic execution of this recent SHC-compiled XCSSET dropper, currently with 0 detections on VirusTotal despite having been known for 2 months, also reveals that the malware authors have changed tactics from hiding the primary executable in a fake Xcode.app in the initial versions in 2020 to a fake Mail.app in 2021 and now to a fake Notes.app in 2022. For example, when you compile a script, Script Editor goes line by line through the code to make sure every AppleScript command is spelled and used. These fake apps are invariably dropped in a parent folder created in random locations in the user’s Library folder. #Years used runonly applescripts detection for code# You can choose Run Only or not if you do, then anybody with just the. When executed, this particular sample writes the fake Notes.app to: ~/Library/Application Scripts/com.apple. #Years used runonly applescripts detection for download#.#Years used runonly applescripts detection for code#.
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