ThiefQuest

ThiefQuest prepends a copy of itself to the beginning of an executable file while maintaining the name of the executable.

ThiefQuest exfiltrates targeted file extensions in the /Users/ folder to the command and control server via unencrypted HTTP. Network packets contain a string with two pieces of information: a file path and the contents of the file in a base64 encoded string.

ThiefQuest uses the CGEventTap functions to perform keylogging.

ThiefQuest obtains a list of running processes using the function kill_unwanted.

ThiefQuest uses AppleScript's osascript -e command to launch ThiefQuest's persistence via Launch Agent and Launch Daemon.

ThiefQuest uploads files via unencrypted HTTP.

ThiefQuest can download and execute payloads in-memory or from disk.

ThiefQuest uses various API to perform behaviors such as executing payloads and performing local enumeration.

ThiefQuest encrypts a set of file extensions on a host, deletes the original files, and provides a ransom note with no contact information.

ThiefQuest invokes time call to check the system's time, executes a sleep command, invokes a second time call, and then compares the time difference between the two time calls and the amount of time the system slept to identify the sandbox.

ThiefQuest uses the kill_unwanted function to get a list of running processes, compares each process with an encrypted list of “unwanted” security related programs, and kills the processes for security related programs.

ThiefQuest installs a launch item using an embedded encrypted launch agent property list template. The plist file is installed in the ~/Library/LaunchAgents/ folder and configured with the path to the persistent binary located in the ~/Library/ folder.

When running with root privileges after a Launch Agent is installed, ThiefQuest installs a plist file to the /Library/LaunchDaemons/ folder with the RunAtLoad key set to true establishing persistence as a Launch Daemon.

ThiefQuest searches through the /Users/ folder looking for executable files. For each executable, ThiefQuest prepends a copy of itself to the beginning of the file. When the file is executed, the ThiefQuest code is executed first. ThiefQuest creates a hidden file, copies the original target executable to the file, then executes the new hidden file to maintain the appearance of normal behavior.

ThiefQuest hides a copy of itself in the user's ~/Library directory by using a . at the beginning of the file name followed by 9 random characters.