Unit 42 Uncovers PEERSTITCH, a Stealthy FortiGate Implant (opens in a new tab)
Why readDetails PEERSTITCH, a novel in-memory ARM64 implant deployed on FortiGate firewalls via CVE-2025-61624 path traversal.
Palo Alto Networks Unit 42 uncovered an intrusion campaign exploiting CVE-2025-61624 path traversal to deploy PEERSTITCH, an in-memory ARM64 implant on FortiGate firewalls. PEERSTITCH leaves no persistent disk binary, opens no ports, and piggybacks on legitimate process traffic to evade detection. The attackers exfiltrated configuration archives, crypto material, and management databases covering over 500 firewalls.
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