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Spring4Shell

Peretas Mengeksploitasi Bug Confluence Atlassian untuk Menyebarkan Backdoor Ljl untuk Spionase

August 5, 2022 by Eevee

Seorang aktor ancaman mengeksploitasi kelemahan keamanan di server Atlassian Confluence yang sudah ketinggalan zaman untuk menyebarkan Backdoor yang belum pernah terlihat sebelumnya terhadap organisasi yang tidak disebutkan namanya di sektor penelitian dan layanan teknis.

Serangan itu, yang terjadi selama tujuh hari selama akhir Mei, telah dikaitkan dengan klaster aktivitas ancaman yang dilacak oleh perusahaan keamanan siber Deepwatch sebagai TAC-040.

Kerentanan Atlassian yang diduga telah dieksploitasi adalah CVE-2022-26134, cacat injeksi Object-Graph Navigation Language (OGNL) yang membuka jalan bagi eksekusi kode arbitrer pada Confluence Server atau contoh Data Center.

Menyusul laporan eksploitasi aktif dalam serangan dunia nyata, masalah ini ditangani oleh perusahaan Australia pada 4 Juni 2022.

Tetapi mengingat tidak adanya artefak forensik, Deepwatch berteori bahwa pelanggaran tersebut dapat menyebabkan eksploitasi kerentanan Spring4Shell (CVE-2022-22965) untuk mendapatkan akses awal ke aplikasi web Confluence.

Tidak banyak yang diketahui tentang TAC-040 selain fakta bahwa tujuan kolektif musuh mungkin terkait dengan spionase, meskipun kemungkinan bahwa kelompok tersebut dapat bertindak demi keuntungan finansial belum dikesampingkan, dengan alasan adanya pemuat untuk penambang kripto XMRig pada sistem.

Meskipun tidak ada bukti bahwa penambang dieksekusi dalam insiden ini, alamat Monero yang dimiliki oleh pelaku ancaman telah menjaring setidaknya 652 XMR ($106.000) dengan membajak sumber daya komputasi sistem lain untuk menambang cryptocurrency secara ilegal.

Rantai serangan juga terkenal karena penerapan implan yang sebelumnya tidak berdokumen yang disebut Ljl Backdoor di server yang disusupi. Kira-kira 700MB data yang diarsipkan diperkirakan telah dieksfiltrasi sebelum server diambil offline oleh korban, menurut analisis log jaringan.

Malware, pada bagiannya, adalah virus trojan berfitur lengkap yang dirancang untuk mengumpulkan file dan akun pengguna, memuat muatan .NET sewenang-wenang, dan mengumpulkan informasi sistem serta lokasi geografis korban.

Sumber: The Hacker News

Tagged With: Backdoor, Bug, eksploitasi, Ljl Backdoor, peretas, spionase, Spring4Shell

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