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BMP File

Lazarus Group Menggunakan Taktik Baru untuk Menghindari Deteksi

April 20, 2021 by Winnie the Pooh

Peneliti keamanan dengan Malwarebytes telah mengamati aktor ancaman persisten tingkat lanjut yang berafiliasi dengan Korea Utara, Lazarus Group, menggunakan teknik baru untuk mengirimkan malware sambil menghindari alat keamanan.

Lazarus dikenal karena mengembangkan keluarga malware khusus dan menggunakan taktik baru. Salah satu metode terbarunya melibatkan penyematan file Aplikasi HTML (HTA) berbahaya dalam file zlib terkompresi, dalam file PNG.

Selama waktu proses, file PNG diubah menjadi format file BMP. Karena file BMP tidak dikompresi, mengubah dari PNG ke BMP secara otomatis mendekompresi objek zlib berbahaya. Peneliti menyebut ini cara cerdas untuk menghindari deteksi. Karena objek berbahaya dikompresi di dalam gambar PNG, ini melewati deteksi statis.

Serangan ini kemungkinan besar dimulai dengan kampanye phishing yang mengirimkan email dengan file berbahaya yang dilampirkan. Saat dibuka, file meminta penampilnya untuk mengaktifkan makro.

Melakukan ini akan menghasilkan kotak pesan; mengeklik ini akan memuat umpan phishing terakhir – formulir partisipasi untuk pameran di kota di Korea Selatan. Dokumen dipersenjatai dengan makro yang dijalankan saat dibuka.

Baca postingan blog lengkap untuk informasi lebih lanjut.

Selengkapnya: Dark Reading

Tagged With: BMP File, Cybersecurity, Lazarus

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