We The Believers Mac OS

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We The Believers Mac Os X
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We The Believers Mac Os 11

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The OS X-specific dropper is also served to Linux clients. Since the dropped payload is designed for OS X only, Linux clients will not be infected.

This analysis is focused on the OS X payload and the network protocol it used to communicate with its Command and Control (C&C) server.

OS X uses the Mach-O file format for its executable files. For OSX/Lamadai.A, the Mach-O executable was compiled for 64-bit only, which is unusual since Mach-O binaries normally contain both the 32-bit and 64-bit versions of the executable.

Upon execution, the threat copies itself to /Library/Audio/Plug-Ins/AudioServer and adds a launcher script named ~/Library/LaunchAgents /com.apple.DockActions.plist pointing to the copied file to ensure it is executed whenever the current user logs in.

Note that by default, on OS X 10.7.2, regular users do not have write permissions to /Library/Audio/Plug-Ins/AudioServer, meaning this threat is not persistent (i.e. it won’t survive a reboot). We are unsure if older versions of OS X have different filesystem permissions. Nonetheless, using another location under the user’s home directory would have worked better for the attacker.

We The Believers Mac Os X

Afterwards, the threat will try to contact its C&C server by resolving dns.assyra.com (100.42.217.73 at the time of analysis, the domain now points to 127.0.0.1) and establishing a TCP connection to port 8008. The server will respond with a TCP RST unless it has some instructions to communicate. The infected system then falls into a busy wait loop, trying to reconnect at random intervals ranging from 0 to 10 seconds.

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The server may issue one of the three following instructions to the infected system:

Upload a file: the C&C sends the path to upload, the client responds with the file content;
Download a file: the C&C sends the file path and content, the client creates the file with permissions set to 777 (-rwxrwxrwx);
Start a remote shell: the C&C sends an arbitrary shell command, the client responds with the output.

All communications between the client and the C&C are encrypted with AES and XOR. The crypto seems to be performed with a slightly modified implementation of AES and SHA1 from the PolarSSL library. The AES keys are generated from the first forty (40) bytes coming from the C&C. While the keys are constant during the entire communication, two different hardcoded XOR keys are used, one for incoming traffic and one for outgoing traffic.

Furthermore, the malware will not act upon any instruction unless the first packet received from the C&C matches a hardcoded key 16 bytes long, as seen in the picture below. The client will also add that key to the first response it will send to the C&C.

Finally, a custom SHA1-based hash is appended to every information packet going to and from the C&C for authentication and integrity checking purposes:

hash = SHA1(key1 + sha1(key2 + encrypted_packet_content + packet_number))where key1 and key2 are two 64-byte strings derived from the first XOR key

During our investigation, we observed a live dialog between the C&C and our test machine. The timing and nature of the instructions received from the C&C lead us to believe that they were being manually typed by a human. Here are a few interesting pieces:

After some filesystem browsing, the C&C issued two File Upload instructions targeting one Keychain file and the Safari’s cookies store. The purpose here clearly is information stealing.

A lot of effort has been put into the network protocol, which is quite involved. The operators seemed to have a real interest in hiding the raw communication from a network dump so as to make reverse engineering more difficult. However, the use of symmetric cryptography makes it so that it is totally possible to reproduce the encryption and decryption routines and analyze the communication on-the-fly.

This attack is another reminder to stay current with OS patches as Apple patched this vulnerability in Java for Mac OS X 10.7 Update 1 and Java for Mac OS X 10.6 Update in November 2011.

ESET security software (including ESET Cybersecurity for Mac) since signature update 7001 detects this threat as OSX/Lamadai.A. Some AV vendors flagged the file as OSX/Olyx, a previous Mac malware. We did not find any relation between the two threats, the network protocol and obfuscation techniques being different.

MD5 of the files analyzed:
39084b60790ca3fdebe1cd93a4764819 file-mac.tmp (OSX payload)

MD5 of related files
7f7cbc62c56aec9cb351b6c1b1926265 file-win.tmp (Win32 payload)
dd7421fb6ca03c5752a06cffb996285a index.jar (OSX/Linux dropper)
2d86dce83851f76493ba0492d066c095 default.jar (Win32 dropper)
4b6eb782f9d508bbe0e7cfbae1346a43 index.html (HTML serving the droppers)

Thanks to Marc-Étienne M. Léveillé who performed the technical analysis.

Alexis Dorais-Joncas

Discussion

macOS Big Sur elevates the most advanced desktop operating system in the world to a new level of power and beauty. Experience Mac to the fullest with a refined new design. Enjoy the biggest Safari update ever. Discover new features for Maps and Messages. And get even more transparency around your privacy.

Check compatibility

macOS Big Sur is compatible with these computers:

MacBook introduced in 2015 or later
MacBook Air introduced in 2013 or later
MacBook Pro introduced in late 2013 or later
Mac mini introduced in 2014 or later
iMac introduced in 2014 or later
iMac Pro
Mac Pro introduced in 2013 or later
View the complete list of compatible computers.

If upgrading from macOS Sierra or later, macOS Big Sur requires 35.5GB of available storage to upgrade. If upgrading from an earlier release, macOS Big Sur requires up to 44.5GB of available storage. To upgrade from OS X Mountain Lion, first upgrade to OS X El Capitan, then upgrade to macOS Big Sur.

Make a backup

Before installing any upgrade, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.

Get connected

It takes time to download and install macOS, so make sure that you have a reliable Internet connection. If you're using a Mac notebook computer, plug it into AC power.

Download macOS Big Sur

If you're using macOS Mojave or later, get macOS Big Sur via Software Update: Choose Apple menu  > System Preferences, then click Software Update.

Or use this link to open the macOS Big Sur page on the App Store: Get macOS Big Sur. Then click the Get button or iCloud download icon.

Begin installation

After downloading, the installer opens automatically.

Click Continue and follow the onscreen instructions. You might find it easiest to begin installation in the evening so that it can complete overnight, if needed.

If the installer asks for permission to install a helper tool, enter the administrator name and password that you use to log in to your Mac, then click Add Helper.

Allow installation to complete

Please allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar, or show a blank screen several times as it installs both macOS and related updates to your Mac firmware.

Stay up to date

After installing macOS Big Sur, you will be notified when updates to macOS Big Sur are available. You can also use Software Update to check for updates: Choose Apple menu  > System Preferences, then click Software Update.

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Or get macOS Big Sur automatically

If you're using OS X El Capitan v10.11.5 or later and your App Store preferences or Software Update preferences are set to download new updates when available, macOS Big Sur will download conveniently in the background, making it even easier to upgrade. A notification will inform you when macOS Big Sur is ready to be installed. Click Install to get started, or dismiss the notification to install later. When you're ready to install, just open the file named Install macOS Big Sur from your Applications folder.

Learn more

If the installer shows a list of apps that are not optimized for your Mac, learn about 32-bit app compatibility, then choose whether to proceed with the installation.
For the strongest security and latest features, upgrade to macOS Big Sur. If you have hardware or software that isn't compatible with Big Sur, you might be able to install an earlier macOS.
You can also use macOS Recovery to reinstall the macOS you're using now, upgrade to the latest compatible macOS, or install the macOS that came with your Mac.