UNC5221
Chinese APT deploys new malware to keep access to hacked networks
A Chinese espionage group tracked as UNC5221 has been accessing Microsoft 365 environments using the Brickstorm backdoor and previously undocumented malware named Plenet and AgentPSD. An investigation into the incident revealed that the threat actor had gained access to the victim network at least 18 months before detection, and had also compromised the victim organization’s […]
Google: Brickstorm malware used to steal U.S. orgs’ data for over a year
Suspected Chinese hackers have used the Brickstorm malware in long-term persistence espionage operations against U.S. organizations in the technology and legal sectors. Brickstorm is a Go-based backdoor documented by Google in April 2024 following China-related intrusions that spawned from various edge devices and remained undetected in the victim environment for more than a year, on average. The […]
Ivanti EPMM flaw exploited by Chinese hackers to breach govt agencies
Chinese hackers have been exploiting a remote code execution flaw in Ivanti Endpoint Manager Mobile (EPMM) to breach high-profile organizations worldwide. The flaw is identified as CVE-2025-4428 and received a high-severity score. The issue can be leveraged to execute code remotely on Ivanti EPMM version 12.5.0.0 and earlier via specially crafted API requests. Ivanti disclosed the flaw together […]
Ivanti patches Connect Secure zero-day exploited since mid-March
Ivanti has released security updates to patch a critical Connect Secure remote code execution vulnerability exploited by a China-linked espionage actor to deploy malware since at least mid-March 2025. Tracked as CVE-2025-22457, this critical security flaw is due to a stack-based buffer overflow weakness. It impacts Pulse Connect Secure 9.1x (which reached end-of-support in December), Ivanti […]