FortiClient EMS Exploited via CVE-2026-35616 to Deliver EKZ Infostealer Disguised as a Fortinet Patch
In May 2026, Arctic Wolf observed a cluster of malicious activity affecting endpoints managed by FortiClient Endpoint Management Server (EMS). The malicious payload was disguised as a fake Fortinet endpoint patch, but it was actually a credential stealer. We named this payload EKZ Infostealer, based on internal symbol names extracted from decrypted code.