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ico (icon) file containing a Microsoft word icon image. Once opened, the JAR file will infect the system, and strangely, will also open a.
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The same will also be true if the file is copied onto a non-Mac drive before being opened, such as a Windows network share, where the quarantine flag will be lost. In the event that the user downloads the JAR file using an email client that does not use the right file system code, and thus does not set a quarantine flag, the file will immediately open when double-clicked, without any complaints. In such cases, users can and do bypass these warnings and open the malicious installers successfully.
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Still, a significant amount of Mac malware droppers in the last year or so have been unsigned, and have given users instructions on what to expect and how to open the file. There are ways that Mac users can bypass this and open the file anyway, but not without seeing a similar warning first. This means that the Gatekeeper feature of macOS will not allow it to execute by default. The good news is that, if it was downloaded from an email client or browser that uses modern file system code, it will be marked with a “quarantine” flag.
The dropper – named Statement SKBMT 09818.jar in this case – would need to be opened by the user. A source at ESET reported that they had detected this malware back in January, with the JAR file being distributed via email. These could be Java developers, for example, at a particular company, or perhaps employees at a company that uses Java-based tools. However, another reason is that the malware is targeted at specific individuals who are known to have Java installed. This is something often seen with more amateurish malware, and there are definitely some indications of that with this malware. One is unfamiliarity with modern macOS, from a malware developer who has Java on their system but doesn’t understand this is non-standard for some reason. There can be a couple reasons why a JAR file might be used on macOS. This means that Java is no longer a very useful means of attack on modern macOS systems. Since then, the only way Java can be on a system is if the user has installed it, which most users won’t. This meant that all Macs were vulnerable, and to make matters worse, despite updates from Oracle (Java’s owner), more vulnerabilities kept being found and exploited.Īpple responded by ripping Java out of the system. Back around 2011 to 2012, there was a flood of multiple different pieces of malware designed to infect Macs via vulnerabilities in Java, which at the time was installed on every Mac out of the box.
However, this file format has a very significant disadvantage for the attacker, which is that macOS does not, by default, include Java, and has not for quite some time. One major advantage, for the attacker, of using Java is that the “dropper” (the file responsible for installing the malware) can be cross-platform.
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Such a file contains code that can be executed by Java, dropping the malware on the system. XLoader appears to be distributed within a. Fortunately, more details have since come to light. Unfortunately, Check Point was a bit vague on the details of how the Mac version behaves, leaving folks unsure of exactly how to protect themselves against this malware. According to Check Point, the Mac version of the malware is being “rented” as part of a malware-as-a-service program, at the price of $49 for one month or $99 for three months. It was identified as being the successor of something called Formbook, a very prevalent threat in the Windows world.
Last week, Check Point Research described a new Mac variant of malware they call XLoader.
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