The Genians Security Center (GSC) detected an APT (Advanced Persistent Threat) campaign targeting users of Facebook, email, and Telegram in Korea between March and April 2025. The threat actor explored reconnaissance and selected attack targets through two Facebook accounts.
Chaos RAT is an open-source remote administration tool written in Golang that has evolved since 2022 to support both Linux and Windows platforms. A critical vulnerability identified as CVE-2024-30850 exists in its web control panel, allowing remote code execution on the server. Although currently limited in usage, Chaos RAT's low detection profile enables threat actors to perform espionage, data exfiltration, and maintain persistent access. The malware employs multiple techniques including privilege escalation, persistence, and command and control communications. Organizations should prioritize patching the vulnerable control panel, restrict access to administrative interfaces, and monitor for indicators of compromise. The threat is assessed as high severity due to its potential impact and ease of exploitation without user interaction. Patch status is not confirmed; no official fix or patch links are provided. The affected platforms include Linux and Windows systems. No specific countries are identified as targeted, but those with significant Linux and Windows server use and strategic geopolitical interests may be at higher risk.
APT37, a North Korean state-sponsored group, conducted a spear phishing campaign named 'Operation ToyBox Story' targeting activists focused on North Korea. The attack used emails with Dropbox links to malicious LNK files that deployed RoKRAT malware, which collected system information, screenshots, and exfiltrated data to cloud-based C2 servers. The campaign employed fileless attacks, multiple encryption layers, and used legitimate cloud services for command and control to evade detection. The threat actors impersonated academic events and used decoy documents to lure targets, highlighting the need for advanced endpoint detection and response solutions.
A series of attacks targeting Korean Internet cafés have been identified, focusing on systems with specific management software installed. The threat actor, active since 2022, uses Gh0st RAT for system control and ultimately installs T-Rex CoinMiner for cryptocurrency mining. The initial access method remains unknown. The attacks involve memory patching of management software and use of downloaders. The malware suite includes Gh0st RAT, its droppers, patchers, downloaders, and T-Rex CoinMiner. Unlike typical coin mining operations using XMRig for Monero, this actor employs T-Rex, likely due to the presence of high-performance GPUs in Internet café PCs. The attacks have been ongoing since late 2024, prompting responses from management software manufacturers.
The report details a sophisticated APT attack targeting South Korea, utilizing spear-phishing techniques and malicious HWP files distributed through a popular Korean messenger service. The APT37 group exploited trust-based tactics, using compromised accounts to spread malware through group chats. The malicious files contained OLE objects that executed PowerShell commands and shellcode, ultimately deploying the RoKRAT malware. This file-less attack method allowed for information gathering and potential remote control of infected systems. The attackers used pCloud for data exfiltration and command-and-control communication. The report emphasizes the importance of endpoint detection and response (EDR) systems to combat such evolving threats.
