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You are here: Home / News / Malware JavaScript baru yang tersembunyi menginfeksi PC Windows dengan RAT

Malware JavaScript baru yang tersembunyi menginfeksi PC Windows dengan RAT

November 25, 2021 by Winnie the Pooh

Loader JavaScript tersembunyi baru bernama RATDispenser sedang digunakan untuk menginfeksi perangkat dengan berbagai trojan akses jarak jauh (RAT) dalam serangan phishing.

Loader baru dengan cepat membangun kemitraan distribusi dengan setidaknya delapan keluarga malware, semuanya dirancang untuk mencuri informasi dan memberi aktor kendali atas perangkat target.

Dalam 94% kasus yang dianalisis oleh tim Riset Ancaman HP, RATDispenser tidak berkomunikasi dengan server yang dikendalikan aktor dan hanya digunakan sebagai dropper malware tahap pertama.

Berlawanan dengan tren penggunaan dokumen Microsoft Office untuk menjatuhkan payload, loader ini menggunakan lampiran JavaScript, yang menurut HP memiliki tingkat deteksi yang rendah.

Infeksi dimulai dengan email phishing yang berisi lampiran JavaScript berbahaya yang diberi nama dengan ekstensi ganda ‘.TXT.js’. Karena Windows menyembunyikan ekstensi secara default, jika penerima menyimpan file ke komputer mereka, itu akan muncul sebagai file teks yang tidak berbahaya.

File teks ini sangat dikaburkan untuk melewati deteksi oleh perangkat lunak keamanan dan akan didekodekan saat file diklik dua kali dan diluncurkan.

Setelah diluncurkan, loader akan menulis file VBScript ke folder %TEMP%, yang kemudian dijalankan untuk mengunduh muatan malware (RAT).

Lapisan kebingungan ini membantu malware menghindari deteksi 89% setiap saat, berdasarkan hasil pemindaian VirusTotal.

Namun, email gateway akan mendeteksi loader jika organisasi telah mengaktifkan pemblokiran lampiran executable, seperti file .js, .exe, .bat, .com.

Cara lain untuk menghentikan rantai infeksi agar tidak terbuka adalah dengan mengubah file handler default untuk file JS, hanya mengizinkan skrip yang ditandatangani secara digital untuk dijalankan, atau menonaktifkan WSH (Windows Script Host).

Selengkapnya: Bleeping Computer

Tagged With: Cybersecurity, Phishing, RAT, RATDispenser

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