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Spring Framework

Microsoft: Botnet Sysrv menargetkan server Windows, Linux dengan eksploitasi baru

May 17, 2022 by Eevee

Microsoft mengatakan botnet Sysrv sekarang mengeksploitasi kerentanan di Spring Framework dan WordPress untuk menjerat dan menyebarkan malware cryptomining pada server Windows dan Linux yang rentan.

Redmond menemukan varian baru (dilacak sebagai Sysrv-K) yang telah ditingkatkan dengan lebih banyak kemampuan, termasuk memindai penyebaran WordPress dan Spring yang belum ditambal.

“Kerentanan ini, yang semuanya telah diatasi oleh pembaruan keamanan, termasuk kerentanan lama di plugin WordPress, serta kerentanan yang lebih baru seperti CVE-2022-22947.”

CVE-2022-22947 adalah kerentanan injeksi kode di library Spring Cloud Gateway yang dapat disalahgunakan untuk eksekusi kode jarak jauh pada host yang belum ditambal.

Sebagai bagian dari kemampuan yang baru ditambahkan ini, Sysrv-K memindai file konfigurasi WordPress dan cadangannya untuk mencuri kredensial basis data, yang kemudian digunakan untuk mengambil alih server web.

Pertama kali ditemukan oleh peneliti keamanan Alibaba Cloud (Aliyun) pada Februari setelah aktif sejak Desember 2020, malware ini juga mendarat di radar peneliti keamanan di Lacework Labs dan Juniper Threat Labs menyusul lonjakan aktivitas di bulan Maret.

Seperti yang mereka amati, Sysrv memindai Internet untuk server perusahaan Windows dan Linux yang rentan dan menginfeksi mereka dengan penambang Monero (XMRig) dan muatan malware yang menyebar sendiri.

Untuk meretas masuk ke server web ini, botnet mengeksploitasi kelemahan dalam aplikasi web dan database, seperti PHPUnit, Apache Solar, Confluence, Laravel, JBoss, Jira, Sonatype, Oracle WebLogic, dan Apache Struts.

Setelah membunuh penambang cryptocurrency yang bersaing dan menyebarkan muatannya sendiri, Sysrv juga menyebar secara otomatis melalui jaringan melalui serangan brute force menggunakan kunci pribadi SSH yang dikumpulkan dari berbagai lokasi di server yang terinfeksi (mis., riwayat bash, konfigurasi ssh, dan file known_hosts).

Komponen propagator botnet akan secara agresif memindai Internet untuk sistem Windows dan Linux yang lebih rentan untuk ditambahkan ke pasukan bot penambangan Monero.

Sysrv sepenuhnya mengkompromikan mereka menggunakan eksploitasi yang menargetkan injeksi kode jarak jauh atau kerentanan eksekusi yang memungkinkannya mengeksekusi kode berbahaya dari jarak jauh.

Sumber: Bleeping Computer

Tagged With: botnet Sysrv, eksploitasi, Spring Framework, Sysrv-K, WordPress

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