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Massive Scan Campaign Targets GlobalProtect VPN Portals

🔎 GreyNoise reports a roughly 40x surge in malicious scans against Palo Alto Networks GlobalProtect VPN login portals beginning November 14, with about 2.3 million sessions hitting the /global-protect/login.esp endpoint between Nov 14–19. Activity focused on the United States, Mexico, and Pakistan and is linked to recurring TCP/JA4t fingerprints and ASN reuse, notably AS200373 and AS208885. GreyNoise recommends treating these probes as active reconnaissance — block and monitor attempts rather than dismissing them.