Rewterz Threat Alert – Dark Crystal RAT – IoCs

Severity

Medium

Analysis Summary

Researchers have analyzed the Dark Crystal RAT capabilities and C2 message format. Unlike a real RAT server, this one does not have a user interface to allow the attacker to pick and launch commands. Instead, it has a pre-scripted command list that it sends to the RAT. When the server starts up, it uses the Python BaseHTTPServer to begin listening for incoming web requests. Incoming POST requests are assumed to hold a file that the RAT is uploading to the server; this server assumes all file uploads are screenshots and saves them to “screen.png”. The server sends four types of commands in sequence: first, it hides the desktop icons; then, it causes the string “Hello this is tech support” to be spoken; next, it displays a message box asking for a password; finally, it launches the Windows Calculator.

Impact

Unauthorized Remote Access

Indicators of Compromise

Domain Name

• domalo[.]online
• files[.]dcrat[.]ru

MD5

• 047af34af65efd5c6ee38eb7ad100a01

SHA-256

• 931972b7531ee614ff9f9403fb0612ca4e3d668c5bfbedacb9fe18e4ac312f1d

SHA1

• 61809e8f559b27e72a603a45a53116327845dbeb

Remediation

Block the threat indicators at their respective controls.