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CTA TIPS Ghost Mach-O: an analysis of Lazarus’ Mac-malware innovations
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The technique is actually very interesting. The Lazarus trojan loader component used MemoryBasedBundle which allows Mach-O code to be executed directly from memory rather than from a file on disk, thereby evading disk-based file object detections by Mac AV.
In this paper we will demystify this novel fileless technique, analysing how and why it works. In order to provide the context for increasing Lazarus sophistication, we will discuss their various campaigns that targeted crypto-currency exchanges and other financial institutions. In fact, it was the Union Crypto Trader app that was trojanised with the fileless component mentioned earlier. Lazrus’ level of commitment to impersonation is so great that its fake trading application installers were hosted on GitHub, and were signed to avoid raising any alarms. This use of open-source trading applications and trojanising them has become a hallmark of Lazarus’ strategy, and can be used to attribute attacks to it.
We will also cover Lazarus’ versatile development skill set using various techniques including the QT framework, C, objective-C, Swift, etc., thus enabling these threat actors to craft innovative Mac malware. We will dissect the sophisticated toolset of the Lazarus group to shed light on its Mac APT modus operandi, with an eye on predicting what its future attacks might look like, along with a discussion on countermeasures.
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