未加星标

Linux cryptocurrency miners are installing rootkits to hide themselves

字体大小 | |
[系统(linux) 所属分类 系统(linux) | 发布者 店小二05 | 时间 2018 | 作者 红领巾 ] 0人收藏点击收藏

Linux cryptocurrency miners are installing rootkits to hide themselves

Security researchers from Trend Micro have stumbled upon a new malware strain that mines cryptocurrency on linux computers, but which is also different from previously seen cryptominers because it downloads a rootkit to alter the operating system's behavior and hide the unwanted high CPU usage that usually comes with cryptocurrency mining.

Currently, Trend Micro has not identified the way through which the malware --which they named KORKERDS-- infects systems, but they don't believe this recent wave of infections is the result of an intrusive mass-hacking campaign.

Instead, researchers believe crooks are using poisoned Linux applications that have been modified to silently download and install the KORKERDS cryptominers during the installation process of a legitimate app. Which app? Trend Micro hasn't figured that out yet.

But researcher did say that the KORKERDS samples they've recently analyzed would do more than just install a Monero miner --also downloading and installing a rootkit, which they described as "a slightly modified/repurposed version of publicly available code."


Linux cryptocurrency miners are installing rootkits to hide themselves
Image: Trend Micro

Besides allowing KORKERDS to survive OS reboots, the rootkit component also contained code a slightly strange feature.

Trend Micro says that KORKERDS' authors modified the rootkit to hide the cryptominer's main process from Linux's native process monitoring tools.

"The rootkit hooks the readdir and readdir64 application programming interfaces (APIs) of the libc library," researchers said. "The rootkit will override the normal library file by replacing the normal readdir file with the rootkit's own version of readdir."

This malicious version of readdir works by hiding processes named "kworkerds" --which in this case is the cryptominers' process.

Linux process monitoring tools will still show 100 percent CPU usage, but admins won't be able to see (and kill) the kworkerds process causing the CPU resource consumption problems.


Linux cryptocurrency miners are installing rootkits to hide themselves

Linux process monitoring tool showing 100% CPU usage, but kworkerds process responsible for this problem

Image: Trend Micro

Trend Micro's KORKERDS report contains a technical breakdown of the malware's infection routine, including file names, processes, and file hashes that Linux users may be interested in tracking and using for debugging possibly-infected systems.

Based on the fact that KORKERDS is distributed inside legitimate apps, this also suggests the malware might also be a threat to Linux desktop users as well, and not only to servers, where almost all Linux cryptominers have been observed in the past two years.

Linux users weren't the only ones that have been targeted by sneaky cryptocurrency-mining malware. Trend Micro also published a second report yesterday on another malware strain that targeted windows users and which also used various techniques in an attempt of staying hidden as much as possible on infected systems.

Related coverage: Microsoft working on porting Sysinternals to Linux

Adobe ColdFusion servers under attack from APT group

Two botnets are fighting over control of thousands of unsecured Android devices

The Linux Code of Conduct is long overdue TechRepublic

A kinder, gentler Linus Torvalds and Linux 4.20 New security flaw impacts most Linux and BSD distros Nintendo Switch turned into Linux tablet by hackers CNET

本文系统(linux)相关术语:linux系统 鸟哥的linux私房菜 linux命令大全 linux操作系统

分页:12
转载请注明
本文标题:Linux cryptocurrency miners are installing rootkits to hide themselves
本站链接:https://www.codesec.net/view/611870.html


1.凡CodeSecTeam转载的文章,均出自其它媒体或其他官网介绍,目的在于传递更多的信息,并不代表本站赞同其观点和其真实性负责;
2.转载的文章仅代表原创作者观点,与本站无关。其原创性以及文中陈述文字和内容未经本站证实,本站对该文以及其中全部或者部分内容、文字的真实性、完整性、及时性,不作出任何保证或承若;
3.如本站转载稿涉及版权等问题,请作者及时联系本站,我们会及时处理。
登录后可拥有收藏文章、关注作者等权限...
技术大类 技术大类 | 系统(linux) | 评论(0) | 阅读(16)