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(Photo source: Pony Strike: Global Offense by FilipinoNinja95)

We recently found Counter-Strike: Global Offensive (CS: Go) hacks on macOS that is also a trojan that could mine CryptoCurrencies without user consent.

According to VirusTotal Retrohunt, the threat is in the wild since the beginning of July 2017.

Warning: At the time of this writing, all URLs are live.

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Entry Point: Vlone.cc Portal

The entry point is vlone.cc portal, where a user can Register, Login and Download for free the hack installer.

The domain name was registered through eNom in April 2017, 14th, and resolves to a shared web host at namecheap:

HTTPS certificate was delivered by COMODO PositiveSSL in June 2017, 27th.

When logged in, members can browse the Prices page and purchase a premium subscription for 1, 3 or 6 months through Selly:

Members download the same archive of the free installer than guests:

According to the user GET query value, members count in August 2017, 22nd, is nearly two thousand.

We don’t know if the private installer of the hack also installs the mining software without user consent.

Binaries analysis

It’s all C++ Standard Library code. Network connections use libcurl and secure HTTPS protocol.

All executables, but the miner CLI, require super-user privileges, so the user must run the installer with sudo:

The main binary hides itself as Dynamic Web TWAIN, an online document scanning platform.

vHook

vHook is the installer. It is packed with UPX, probably to avoid user analysis and bypass some security products.

It is a command line interface:

With a valid member account, it downloads and extracts bootstrap.dylib and vhook.dylib from https://vlone.cc/portal/gateway.php as assets.zip to /Library/Application Support/:

It loads bootstrap.dylib from osxinj project. If Counter-Strike: Global Offensive is running, it downloads and extracts some fonts (https://vlone.cc/fontfix.zip as vlone.zip to /Library/Fonts/), and injects vhook.dylib into csgo_osx64 process.

It could be a perfect deal for a CS: GO user, but it turns out vHook also sneaky downloads and extracts https://vlone.cc/abc/assets/asset.zip as fonts.zip to /var/, changes directory to /var and runs sudo ./helper &.

It then kills Terminal application to hide the detached process output.

helper

helper is the miner downloader dropper. It is also packed with UPX.

It first asks the C&C server for the name of the binary to execute upon download:

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It downloads https://www.vlone.cc/abc/assets/b.zip as /b.zip, extracts its contents to /var/.log/, changes directory to /var/.log/ and runs sudo ./com.dynamsoft.WebHelper &.

At the time of this writing, https://www.vlone.cc/abc/assets/b.zip URL response is a File Not Found 404 error code, but https://www.vlone.cc/abc/assets/bz.zip URL is live and send the expected archive.

com.dynamsoft.WebHelper

com.dynamsoft.WebHelper is the miner downloader. Despite the name, it is not related to Dynamsoft.

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It starts by downloading and extracting:

WebTwainService from https://www.vlone.cc/abc/assets/d.zip to /var/.log/
com.dynamsoft.WebTwainService.plist from https://www.vlone.cc/abc/assets/p.zip to /Library/LaunchDaemons/

It loads the daemon, sends computer unique identifier (UUID) and its version to C&C server, and checks if it meetsRequirements(), i.e. running as root and not in a debugger:

It then sleeps for one hour. If one is in a hurry, he or she can cut out the nap easily:

Once rested, it sends commands to C&C server every minute to ask if it should mine and update or kill itself:

Every minute, it also creates or updates the mining thread to:

download and extract https://www.vlone.cc/abc/assets/helper.zip to /var/.trash/.assets/
get miner settings (maximum core number, currency, email address)
check if Activity Monitor is running
check if it is already mining
check if it should stop mining
run cd /var/.trash/.assets/; ./com.apple.SafariHelper with appropriate arguments

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WebTwainService

WebTwainService tries to take care of com.dynamsoft.webhelper persistency. It is again packed with UPX.

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It sets its current directory to /var/.log and runs sudo ./com.dynamsoft.webhelper &, then recursively sleeps for one hour…

minergate-cli

com.apple.SafariHelper actually is the official MinerGateCLI v4.04:

It is written in Qt, so it comes with frameworks:

It takes as CPU as requested by com.dynamsoft.WebHelper so the user enjoys the delight of computer’s fans background music:

In this example, it is mining Monero (XMR) with all virtual machine cores (two: 200.0%).

Current MinerGate email address is pwnedboi@protonmail.com, and xxanax420@gmail.com email address was also found hardcoded in another sample.

Maximum core number, CryptoCurrency and email address are provided by com.dynamsoft.WebHelper and the C&C server:

vLoader

We finally ended up with vLoader, the private installer, and, once more, it is packed with UPX.

It does many checks against the C&C server:

They are trivial to bypass for anyone who can force a conditional jump:

Private payloads are downloaded and extracted to /var/.old/:

boots.dylib from http://vlone.cc/clear/sadmio.zip
.uhdexter.dylib from http://vlone.cc/clear/getout.zip

Compared to the free injected library, the private hook is very similar:

vLoader doesn’t uninstall any of the free version naughty payloads.

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We didn’t spend too much time reverse engineering vhook.dylib. The source code was available on GitHub (archive)