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Outlook Web Access

Microsoft memperingatkan serangan phishing yang melewati gateway email

March 24, 2021 by Winnie the Pooh

Operasi phishing berkelanjutan yang mencuri sekitar 400.000 kredensial OWA (Outlook Web Access) dan Office 365 sejak Desember kini telah meluas dengan menyalahgunakan layanan baru yang sah untuk melewati secure email gateways (SEG).

Serangan tersebut merupakan bagian dari beberapa kampanye phishing yang secara kolektif dijuluki Kampanye “Compact”, aktif sejak awal tahun 2020 yang pertama kali terdeteksi oleh Tim Intelijen Ancaman Global WMC.

“Phisher terus menemukan keberhasilan dalam menggunakan akun yang disusupi di layanan pemasaran email untuk mengirim email berbahaya dari domain dan range IP yang sah,” kata pakar keamanan Microsoft.

Email phishing mereka disamarkan sebagai pemberitahuan dari layanan konferensi video, berbagai solusi keamanan, dan alat produktivitas untuk menambah legitimasi.

Pelaku ancaman juga menggunakan akun yang disusupi untuk layanan pengiriman email SendGrid dan MailGun, memanfaatkan gateway email yang aman memungkinkan daftar tersebut menjadi domain tepercaya.

Hal ini memungkinkan pesan phishing untuk melewati mereka dan masuk ke kotak masuk target, membujuk mereka untuk mengklik hyperlink yang disematkan yang mengarahkan mereka ke halaman arahan phishing yang dirancang untuk meniru halaman login Microsoft.

Sumber: Microsoft

Domain dan akun yang digunakan selama kampanye phishing ini akan dihapus segera setelah Microsoft dan WMC Global mendeteksinya.

Selengkapnya: Bleeping Computer

Tagged With: Cybersecurity, Microsoft, Office 365, Outlook Web Access, Phishing, Secure Email Gateways

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