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Home » TAG-150 Unleashes CastleRAT: Expanding Malware Operations
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TAG-150 Unleashes CastleRAT: Expanding Malware Operations

Staff WriterBy Staff WriterSeptember 6, 2025No Comments2 Mins Read0 Views
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Quick Takeaways

  1. Malware Landscape: The TAG-150 group has developed the CastleLoader malware-as-a-service and CastleRAT remote access trojan, utilized for delivering various malicious payloads, including remote access trojans and information stealers.

  2. Infection Vectors: Infections commonly originate from themed phishing attacks and deceptive GitHub repositories, leveraging techniques like SEO poisoning for widespread distribution.

  3. Functionality and Capabilities: CastleRAT, available in Python and C, possesses advanced features, such as logging keystrokes, capturing screenshots, and replacing cryptocurrency wallet addresses, enhancing its ability to execute malicious commands.

  4. Active Development: Constant updates are seen within CastleRAT, as evidenced by modifications in its functionality and tactics, including evading security measures through user control prompts and registry modifications.

TAG-150 Expands Malware Arsenal

TAG-150 has developed a new remote access trojan, named CastleRAT, enhancing its CastleLoader malware framework. This malware operates in two programming languages: Python and C. Its primary functions include gathering system information, executing commands, and downloading additional payloads. Recorded Future’s Insikt Group highlights these capabilities, which may allow attackers to gain comprehensive control over infected systems. Since its first observation, CastleLoader has facilitated access to various secondary payloads, such as other malware and information stealers.

Furthermore, cybersecurity firms have traced CastleLoader’s origins back to March 2025. TAG-150 uses innovative techniques like “ClickFix” phishing attacks. These frauds often mimic credible services to trick users. As such, they spread the malware through domains masquerading as software update notifications or verification systems. The simplicity of these methods raises concerns about the potential for widespread infection among unsuspecting users.

Innovative Features and Implications

CastleRAT introduces distinct features with its two variations. The C variant boasts enhanced functionalities, including keylogging and clipboard monitoring, which can facilitate cryptocurrency theft. In addition, both variants use public IP information to provide attackers valuable insights into infected systems. Critics point out that such capabilities pose significant threats to individuals and organizations alike.

As TAG-150 continues to improve its malware, the development reflects a growing trend in cyber threats. The cyber landscape becomes increasingly perilous as malicious actors adopt new approaches. Consequently, companies need to bolster their cybersecurity measures. Effective responses not only protect digital landscapes but also enhance community resilience against evolving threats. Thus, stakeholders must collaborate to ensure safety in an ever-connected world.

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John Marcelli is a staff writer for the CISO Brief, with a passion for exploring and writing about the ever-evolving world of technology. From emerging trends to in-depth reviews of the latest gadgets, John stays at the forefront of innovation, delivering engaging content that informs and inspires readers. When he's not writing, he enjoys experimenting with new tech tools and diving into the digital landscape.

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