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Code Analysis

Malware ‘Beep’ Tersembunyi Baru, Berfokus pada Menghindari Deteksi

February 17, 2023 by Flamango

Ditemukan oleh analis di Minerva setelah sejumlah besar sampel diunggah ke VirusTotal, malware ‘Beep’ menampilkan banyak fitur untuk menghindari analisis dan deteksi oleh perangkat lunak keamanan.

Meskipun masih dalam pengembangan dan kehilangan beberapa fitur utama, saat ini ‘Beep’ memungkinkan pelaku ancaman untuk mengunduh dan mengeksekusi muatan lebih lanjut pada perangkat yang disusupi dari jarak jauh.

Pencuri Info Baru sedang Dibuat
Beep adalah malware pencuri informasi yang menggunakan tiga komponen terpisah yaitu penetes, injektor, dan muatan.

Penetes (“big.dll”) membuat kunci registri baru dengan nilai ‘AphroniaHaimavati’ yang berisi skrip PowerShell yang disandikan base64. Skrip PowerShell ini diluncurkan setiap 13 menit menggunakan tugas terjadwal Windows.

Langkah akhirnya adalah muatan utama mencoba mengumpulkan data dari mesin yang disusupi, mengenkripsinya, dan mengirimkannya ke C2. Selama analisis Minerva, alamat C2 yang di-hardcode sedang offline, tetapi malware mencoba melakukan koneksi bahkan setelah 120 percobaan gagal.

Mengumpulkan data dari sistem yang dilanggar (Minerva)
Mengumpulkan data dari sistem yang dilanggar (Minerva)

Meski terbatas, Minerva masih dapat mengidentifikasi fungsi-fungsi dalam sampel yang dipicu oleh perintah C2.

Selain teknik penghindaran, komponen injektor sendiri juga menerapkan teknik penghindaran.

Penyederhanaan string (Minerva)
Penyederhanaan string (Minerva)

‘Beep’ adalah contoh malware yang sangat berfokus pada penghindaran, setelah menerapkan beberapa mekanisme anti-analisis sebelum menyelesaikan kumpulan fitur lengkap untuk pencurian data dan pelaksanaan perintah.

Selengkapnya: BleepingComputer

Tagged With: Anti-Debugging, Code Analysis, Evasion

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