HoneyMyte updates CoolClient and deploys multiple stealers in recent campaigns

Securelist

January 27, 2026 at 8:00 AM

Actively Exploited

Overview

Kaspersky researchers have identified updates to the CoolClient backdoor and the deployment of new tools associated with the HoneyMyte group, also known as Mustang Panda or Bronze President. This group is known for its advanced persistent threat (APT) campaigns, which have now introduced three variants of a browser data stealer. These updates suggest an ongoing effort by attackers to enhance their capabilities and target sensitive data from users. The implications are significant, as organizations and individuals could be at risk of having their personal and financial information stolen. Users are encouraged to remain vigilant and ensure their systems are protected against these evolving threats.

Key Takeaways

Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
Affected Systems: CoolClient backdoor, browser data stealer variants
Action Required: Users should update their security software, monitor for unusual activity, and consider implementing additional security measures such as multi-factor authentication.
Timeline: Newly disclosed

Original Article Summary

Kaspersky researchers analyze updated CoolClient backdoor and new tools and scripts used in HoneyMyte (aka Mustang Panda or Bronze President) APT campaigns, including three variants of a browser data stealer.

Impact

CoolClient backdoor, browser data stealer variants

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 security software, monitor for unusual activity, and consider implementing additional security measures such as multi-factor authentication.

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 APT, Kaspersky.

Read Original Article

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