Reverse Engineering PhantomStealer 4 | Inside a NET Infostealer Using Telegram C2

This video provides a technical reverse engineering analysis of Phantom Stealer version 4, detailing its malicious capabilities including browser credential theft, keylogging, and ransomware functionality 0:50.

Key Takeaways:
• The malware utilizes embedded resources to extract and decrypt browser secrets from Chromium-based browsers like Chrome, Edge, and Brave 2:42.
• It employs extensive anti-analysis techniques, checking for specific usernames, PC names, and sandbox processes to evade detection 11:13.
• Phantom Stealer 4 organizes stolen data into HTML files for exfiltration via Telegram, a notable deviation from standard text-based dumping 17:06.
• The malware includes clipboard monitoring, keylogging, and password recovery features to maximize data theft 16:05.
• While it contains ransomware code using AES encryption, the analysis suggests the decryption keys are not hardcoded, indicating a modular or external dependency for encryption operations 20:01.
• Reverse engineering requires analyzing the intermediate language due to obfuscation, as standard static analysis is hindered by these protections 23:05.

Phantom Stealer remains a significant threat due to its robust feature set and evasion techniques, requiring careful handling in sandbox environments.

Sources:

• 0:50 Initial identification of ransomware-like behavior and data decryption strings.
• 2:42 Extraction of embedded browser dumper files from resources.
• 11:13