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Severity
High
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
- Data Theft
- Exposure of Sensitive Data
Indicators of Compromise
MD5
- a21474a9bcf5ed1a05c556ad52b88232
- d6c2a7fe705e1303325b13c51d244914
- a0fe54de111e388ddeb921093e78648d
SHA-256
- 19891d4317d21efa3e924cb6df49816448435f1270df4ef4d23fd981ab1d19f9
- 74ad99457bbabe425e8cf39918b9918d7191e609ce25e48aab61fb0186888d49
- 03cfd77fd66317ec9548edd89164c567958f3d955f96682816cf19c7237c75db
SHA-1
- 66eaa0dfd346226bf16055f818ddfd7226f0b936
- c72312693b7df014fb52f3406c37a7abc7d8721b
- a19f4c0afd758eebaaab0f0b13b4167c3707fce1
Remediation
- Block the threat indicators at their respective controls.
- Search for IOCs in your environment.