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You are here: Home / News / Operasi Ransomware Yanluowang Tumbuh Dengan Afiliasi Berpengalaman

Operasi Ransomware Yanluowang Tumbuh Dengan Afiliasi Berpengalaman

December 1, 2021 by Eevee

Afiliasi dari operasi ransomware Yanluowang yang baru-baru ini ditemukan memfokuskan serangannya pada organisasi AS di sektor keuangan menggunakan malware BazarLoader dalam tahap pengintaian.

Berdasarkan taktik, teknik, dan prosedur yang diamati, aktor ancaman berpengalaman dengan operasi ransomware-as-a-service (RaaS) dan dapat dikaitkan dengan kelompok Fivehands.

Koneksi ransomware Fivehands

Para peneliti di Symantec, sebuah divisi dari Broadcom Software, mencatat bahwa aktor tersebut telah mencapai target profil yang lebih tinggi di AS setidaknya sejak Agustus.

Selain lembaga keuangan, afiliasi ransomware Yanluowang juga menargetkan perusahaan di sektor manufaktur, layanan TI, konsultasi, dan teknik.

Melihat taktik, teknik, dan prosedur (TTP), para peneliti melihat kemungkinan hubungan dengan serangan yang lebih tua dengan Thieflock, operasi ransomware yang dikembangkan oleh kelompok Fivehands.

Fivehands ransomware sendiri relatif baru di skena ini, dikenal pada bulan April – pertama kali dalam laporan dari Mandiant, yang melacak pengembangnya sebagai UNC2447, dan kemudian saat dapat peringatan dari CISA.

Pada saat itu, Mandiant mengatakan bahwa UNC2447 menunjukkan “kemampuan canggih untuk menghindari deteksi dan meminimalkan forensik pasca-intrusi,” dan bahwa afiliasinya telah menyebarkan ransomware RagnarLocker.

Alat perdagangan

Setelah mendapatkan akses ke jaringan target, penyerang menggunakan PowerShell untuk mengunduh alat, seperti malware BazarLoader untuk membantu bergerak secara lateral.

BazarLoader dikirim ke target perusahaan oleh botnet TrickBot, yang juga menyebarkan ransomware Conti. Baru-baru ini, operator TrickBot mulai membantu membangun kembali botnet Emotet.

Aktor ancaman Yanluowang memungkinkan layanan desktop jarak jauh (RDP) dari registri dan menginstal alat ConnectWise untuk akses jarak jauh.

Para peneliti mengatakan bahwa afiliasi menemukan sistem yang menarik dengan alat AdFind – untuk query Active Directory, dan SoftPerfect Network Scanner – untuk menemukan nama host dan layanan jaringan.

Beberapa alat digunakan untuk mencuri kredensial dari browser (Firefox, Chrome, Internet Explorer) dari mesin yang dikompromikan: GrabFF, GrabChrome, BrowserPassView.

Peneliti Symantec juga memperhatikan bahwa penyerang menggunakan KeeThief untuk mencuri kunci utama untuk pengelola kata sandi KeePass, alat tangkapan layar, dan utilitas exfiltrasi data Filegrab.

Dalam laporan sebelumnya tentang serangan Yanluowang, perusahaan mengatakan bahwa peretas mengancam dengan serangan denial-of-service (DDoS) dan data wiping jika korban tidak memenuhi tuntutan.

Sumber: Bleepingcomputer

Tagged With: FiveHands, Ransomware-as-a-Service (RaaS), Yanluowang

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