Chinese threat actor UAT-9686 has been compromising Cisco email security systems since late November with a custom backdoor called AquaShell. Organizations should immediately check Cisco Talos advisories for indicators and remediation guidance.

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UAT-9686 Chinese APT Targets Cisco Email Security Appliances

Chinese threat actor UAT-9686 deploys AquaShell backdoor on Cisco Secure Email Gateway appliances with custom persistence.

Security Land | Decoding the Cyber Threat Landscape