Mustang Panda updates CoolClient backdoor with enhanced data theft capabilities

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January 28, 2026 at 5:35 PM

Actively Exploited

Overview

The CoolClient backdoor malware has received an upgrade from the threat actor group Mustang Panda, enhancing its data theft capabilities. This malware is being delivered through legitimate software from the Chinese company Sangfor, which raises concerns about the potential for widespread infection among users of that software. The updated CoolClient now includes improved features such as system profiling, keylogging, and tunneling, allowing attackers to gather sensitive information more effectively. This development poses a significant risk to organizations and individuals who may unknowingly use the compromised software, emphasizing the need for heightened security measures and vigilance against such threats.

Key Takeaways

Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
Affected Systems: Sangfor software products
Action Required: Users should update their Sangfor software and monitor for unusual activity.
Timeline: Newly disclosed

Original Article Summary

The updated CoolClient malware, deployed via legitimate software from Sangfor, refines existing features like system profiling, keylogging, and tunneling.

Impact

Sangfor software products

Exploitation Status

This vulnerability is confirmed to be actively exploited by attackers in real-world attacks. Organizations should prioritize patching or implementing workarounds immediately.

Timeline

Newly disclosed

Remediation

Users should update their Sangfor software and monitor for unusual activity. Implementing endpoint detection systems and conducting regular security audits could also help mitigate risks.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to Malware.

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