MD5: 522962021E383C44AFBD0BC788CF6DA3 6D1A07F57DA74F474B050228C6422790 98638D7CD7FE750B6EAB5B46FF102ABD philofishal patrickwardle thomasareed pic.twitter.comr5tkmfzmFT DineshDevadoss (dineshdina04) June 29, 2020.

Certified Ethical Hacker, Penetration Tester, Security blogger, Co-Founder Author of GBHackers On Security.

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The isvirtualmchn function actually does not appear to check to see if the malware is running in a virtual machine, but rather tries to catch a VM in the process of adjusting time.

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A post offered a torrent download for Little Snitch, and was soon followed by a number of comments that the download included malware.

Best Ransomware For A Mac Ransomware Variant

In fact, we discovered that not only was it malware, but a new Mac ransomware variant spreading via piracy.

To start, the legitimate Little Snitch installer is attractively and professionally packaged, with a well-made custom installer that is properly code signed.

However, this installer was a simple Apple installer package with a generic icon.

Worse, the installer package was pointlessly distributed inside a disk image file.

It is normal for this type of installer to contain preinstall andor postinstall scripts, for preparation and cleanup, but in this case the script was used to load the malware and then launch the legitimate Little Snitch installer.

As there is a legitimate process that is part of macOS named Crash Reporter, this name will blend in reasonably well if seen in Activity Monitor.

It then removes itself from the UsersShared folder and launches the new copy.

The malware got installed, but the attempt to run the Little Snitch installer got hung up indefinitely, until I eventually forced it to quit.

Further, the malware didnt actually start encrypting anything, despite the fact that I let it run for a while with some decoy documents in position as willing victims.

There are undoubtedly other installers floating around as well that have not been seen.

Both variants installed copies of the patch file at the following locations.

Since its quite rare for anyone to actually log in as root, this doesnt serve any practical purpose.

It is not yet known what the purpose of these files or this additional appended data is.

These files had the content of the patch file prepended to them, which of course would mean that the malicious code would run when any of these files is executed.

However, Chrome will see that the files have been modified, and will replace the modified files with clean copies as soon as it runs, so its unclear what the purpose here is.

I left it running on a real machine for some time with no results, then started playing with the system clock.

After setting it ahead three days, disconnecting from the network, and restarting the computer a couple times, it finally began encrypting files.

It appeared to encrypt a number of settings files and other data files, such as the keychain files.

Other apps would also freeze periodically, but the Finder freezes could only be managed by force quitting the Finder.

This is common with malware, as having a debugger attached to the process or being run inside a virtual machine are both indications that a malware researcher is analyzing it.

In such cases, malware will typically not display its full capabilities.