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This script has several functions.First, it will contact a command & control server formerly hosted on Amazon AWS. Malware life cycleThe malicious JavaScript code installs a launch agent plist file for the current user, which is designed to launch a script named verx.sh once per hour. YouвЂ™d already be infected. The user would then be asked if they want to allow a program to run вЂњto determine if the software can be installed.вЂќThis means that, if you were to click Continue, but then think better of it and quit the installer, it would be too late. Pkg files included JavaScript code, in such a way that the code would run at the very beginning, before the installation has really started.

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Although we know that the script will store the payload at /tmp/verx, we have yet to see any instances of this payload on any infected machines.If the payload were actually downloaded, it would be launched with the args data as the arguments.Separate from the files dropped by the JavaScript, the. In this case, the script does exactly that, then exits.Finally, it will try to determine whether there is a newer version of the malware (which will always be the case if the final payload is not yet installed), and if so, it will download the payload from the URL provided in the downloadUrl parameter in the data from the command & control server.However, as can be seen from the data, at the time of analysis, the download URL was blank. From Malwarebytes data, it appears that this is a zero-byte file, and the malware simply uses it as a marker to indicate that it should delete itself.

Path~/Library/Application Support/verx_updaterMalwarebytes Silver Sparrow detections ConclusionsAt this time, we have yet to see the /tmp/verx payload. _insu file, and machines that have that file present do not have any of the other components (as expected). The vast majority of вЂњinfectionsвЂќ are actually represented by the. CountryThe paths detected show a rather interesting pattern.

Since this file signals that the malware should delete itself (though we donвЂ™t know how the file gets created), that is a strong indicator that these are probably formerly infected machines.Thus, itвЂ™s highly likely that this infection may have been present at some point in the recent past, but the operators sent out a silent вЂњkillвЂќ command to cause the malware to delete itself. _insu file has been seen in such high numbers is interesting. After all, malware that is sold to, and used by, multiple people may very well include some kind of вЂњcustomer code.вЂќThe fact that the. However, we canвЂ™t make assumptions based on a single ten-character string, as such assumptions could very easily be wrong. This means that, as Red Canary said, we have little information on what the intent of this malware is.Yes, Malwarebytes protects your Mac from Silver Sparrow.The args value in the data from the command and control server ( upbuchupsf) looks similar to an affiliate code, often used by adware.

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