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Harvester

Peretas yang didukung negara melanggar perusahaan telekomunikasi dengan malware khusus

October 20, 2021 by Winnie the Pooh

Aktor yang disponsori negara yang sebelumnya tidak dikenal sedang menyebarkan perangkat baru dalam serangan yang menargetkan penyedia telekomunikasi dan perusahaan TI di Asia Selatan.

Tujuan kelompok tersebut — dilacak sebagai Harvester oleh para peneliti di Symantec yang menemukannya — adalah untuk mengumpulkan intelijen dalam kampanye spionase yang sangat bertarget yang berfokus pada TI, telekomunikasi, dan entitas pemerintah.

Alat berbahaya Harvester belum pernah ditemukan di alam liar sebelumnya, menunjukkan bahwa ini adalah aktor ancaman tanpa koneksi ke musuh yang diketahui.

Berikut ringkasan alat yang digunakan oleh operator Harvester dalam serangan mereka:

  • Backdoor.Graphon – pintu belakang khusus yang menggunakan infrastruktur Microsoft untuk aktivitas C&C-nya
  • Custom Downloader – menggunakan infrastruktur Microsoft untuk aktivitas C&C-nya
  • Custom Screenshotter – secara berkala mencatat tangkapan layar ke file
  • Cobalt Strike Beacon – menggunakan infrastruktur CloudFront untuk aktivitas C&C-nya (Cobalt Strike adalah alat siap pakai yang dapat digunakan untuk menjalankan perintah, menyuntikkan proses lain, meningkatkan proses saat ini, atau meniru proses lain, serta mengunggah dan mengunduh file)
  • Metasploit – kerangka kerja modular siap pakai yang dapat digunakan untuk berbagai tujuan jahat pada mesin korban, termasuk eskalasi hak istimewa, tangkapan layar, untuk menyiapkan pintu belakang persisten, dan banyak lagi.

Sementara analis Symantec tidak dapat mengetahui vektor infeksi awal, ada beberapa bukti bahwa URL jahat digunakan untuk tujuan itu.

Graphon memberi aktor akses jarak jauh ke jaringan dan menyamarkan kehadirannya dengan memadukan aktivitas komunikasi perintah-dan-kontrol (C2) dengan lalu lintas jaringan yang sah dari CloudFront dan infrastruktur Microsoft.

Poin menarik ditemukan dalam cara custom downloader bekerja, membuat file yang diperlukan pada sistem, menambahkan nilai registri untuk titik muat baru, dan akhirnya membuka browser web tertanam di hxxps://usedust[.]com.

Symantec memperingatkan bahwa Harvester masih aktif di luar sana, kebanyakan menargetkan organisasi di Afghanistan saat ini.

Selengkapnya: Bleeping Computer

Tagged With: Cybersecurity, Harvester, Malware

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