SiestaGraph And DoorMe Backdoors Used To Target ASEAN Member Foreign Ministry

Multiple threat actors are suspected to be behind attacks focused on the Foreign Affairs office of an ASEAN member.
The adversaries likely took advantage of a flaw in an Internet facing Microsoft Exchange server for initial access.
The DoorMe and SiestaGraph backdoors along with a Cobalt Strike beacon and multiple Windows binaries were used for lateral movement, exfiltrate sensitive data, and perform reconnaissance.

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