APT34, an Iranian threat group aligned with MOIS, has been using MS Exchange servers to spy on Gulf-state government agencies, particularly in the UAE. Known for targeting major industries in the Middle East, APT34 has shown sophistication in its attacks, including the use of a new backdoor named 'StealHook' to exfiltrate sensitive information. The group's espionage campaigns involve deploying Web shells, exploiting vulnerabilities like CVE-2024-30088 for system-level privileges, and abusing Windows password filters

 Iran's APT34 Abuses MS Exchange to Spy on Gulf Gov'ts

APT34's strategy includes stealthy exfiltration channels and leveraging stolen credentials to access organizations' MS Exchange servers for data exfiltration and follow-on supply chain attacks.
https://www.darkreading.com/cyberattacks-data-breaches/iran-apt34-ms-exchange-spy-gulf-govts