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Malware QBot Menyalahgunakan Windows WordPad EXE untuk Menginfeksi Perangkat

May 29, 2023 by Flamango

Operasi malware QBot telah mulai menyalahgunakan cacat pembajakan DLL di program WordPad Windows 10 untuk menginfeksi komputer, menggunakan program yang sah untuk menghindari deteksi oleh perangkat lunak keamanan.

DLL adalah file pustaka yang berisi fungsi-fungsi yang dapat digunakan oleh lebih dari satu program pada saat yang bersamaan. Saat aplikasi diluncurkan, aplikasi akan mencoba memuat DLL apa pun yang diperlukan.

Pembajakan DLL adalah saat pelaku ancaman membuat DLL berbahaya dengan nama yang sama dengan yang sah, dan menempatkannya di jalur pencarian awal Windows, biasanya folder yang sama dengan file yang dapat dieksekusi. Ketika executable itu diluncurkan, itu akan memuat DLL malware daripada yang sah dan menjalankan perintah berbahaya apa pun di dalamnya.

QBot menyalahgunakan kelemahan pembajakan WordPad DLL. QBot atau Qakbot sendiri merupakan malware Windows yang awalnya dimulai sebagai trojan perbankan tetapi berkembang menjadi dropper malware.

Geng ransomware, termasuk Black Basta, Egregor, dan Prolock, telah bermitra dengan operasi malware untuk mendapatkan akses awal ke jaringan perusahaan untuk melakukan serangan pemerasan.

Properti file document.exe, ini hanyalah salinan nama dari file yang dapat dieksekusi Write.exe yang sah yang digunakan untuk meluncurkan editor dokumen Windows 10 WordPad.

Berganti nama Windows 10 WordPad dapat dieksekusi
(Sumber: BleepingComputer)
Berganti nama Windows 10 WordPad dapat dieksekusi
(Sumber: BleepingComputer)

QBot akan diam-diam berjalan di latar belakang, mencuri email untuk digunakan dalam serangan phishing lebih lanjut dan akhirnya mengunduh muatan lain, seperti Cobalt Strike.

Dengan menginstal QBot melalui program tepercaya seperti Windows 10 WordPad (write.exe), pelaku ancaman berharap perangkat lunak keamanan tidak menandai malware sebagai berbahaya.

Saat ini, operasi QBot telah beralih ke metode infeksi lain dalam beberapa minggu terakhir, tetapi tidak jarang mereka beralih ke taktik sebelumnya dalam kampanye selanjutnya.

Selengkapnya: BleepingComputer

Tagged With: DLL Hijack, Malware, Phishing, Qakbot, Qbot, Windows 10, Wordpad

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