Cyberattack: Stealthy Fileless Attack Targets Attendees of Upcoming US-Taiwan Defense Industry Event (cyble.com)
from tardigrada@beehaw.org to technology@beehaw.org on 13 Sep 2024 16:26
https://beehaw.org/post/16037375

Archived version

• Cyble Research and Intelligence Labs (CRIL) identified a campaign targeting individuals connected to the upcoming US-Taiwan Defense Industry Conference, as indicated by the lure document uncovered during the investigation.
• The campaign involves a ZIP archive containing an LNK file that mimics a legitimate PDF registration form for deception.
• When the LNK file is opened, it executes commands to drop a lure PDF and an executable in the startup folder, establishing persistence.
• Upon system reboot, the executable downloads additional content and executes it directly in memory, effectively evading detection by the security products.
• The first-stage loader triggers a second-stage loader, which downloads, decodes, and compiles C# code in memory, avoiding the creation of traceable files on disk.
• Once the compiled code is executed, the malware exfiltrates sensitive data back to the attacker’s server via web requests designed to blend in with normal traffic, making detection more difficult.

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