How to implement CentOS to continuously send out packages
如何实现CentOS不停向外发包?
服务器不停的向外发包,且CPU持续100%,远程登录后查看发现有一长度为10的随机字符串进程,kill掉,会重新生成另外长度为10的字符串进程。删除文件也会重复生成,非常痛苦。查阅crond相关日志,发现实际执行的内容为/lib/libudev.so ,以此为关键字进行查询,找到如下内容:
1.1 工具/原料
Linux系统病毒文件libudev.so
1.2 方法/步骤
1.网络流量暴增,使用 top 观察有至少一個 10 个随机字母組成的程序執行,佔用大量 CPU 使用率。刪除這些程序,馬上又产生新的程序。
2.检查 cat /etc/crontab
发现定时任务 每三分钟执行一个脚本gcc.sh
*/3 * * * * root /etc/cron.hourly/gcc.sh
查看病毒程式 gcc.sh,可以看到病毒本体是 /lib/libudev.so。
[root@deyu ~]# cat /etc/cron.hourly/gcc.sh #!/bin/sh PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:/usr/X11R6/bin for i in `cat /proc/net/dev|grep :|awk -F: {'print $1'}`; do ifconfig $i up& done cp /lib/libudev.so /lib/libudev.so.6 /lib/libudev.so.6
刪除上一行例行工作 gcc.sh
,并设定 /etc/crontab无法变动,否则马上又会产生新的文件。
[root@deyu ~]# rm -f /etc/cron.hourly/gcc.sh && chattr +i /etc/crontab
使用 top 查看病毒為 mtyxkeaofa,id 为 16621,不要直接杀掉程序,否则会再次产生新的文件,而是停止其运行。
[root@deyu ~]# kill -STOP 16621
刪除 /etc/init.d 內的档案。
[root@deyu ~]# find /etc -name '*mtyxkeaofa*' | xargs rm -f
刪除 /usr/bin 內的档案。
[root@deyu ~]# rm -f /usr/bin/mtyxkeaofa
查看 /usr/bin 最近变动的档案,如果是病毒也一併刪除,其他可疑的目錄也一樣。
[root@deyu ~]# ls -lt /usr/bin | head
現在杀掉病毒程序,就不會再产生。
[root@deyu ~]# pkill mtyxkeaofa
刪除病毒本体。
[root@deyu ~]# rm -f /lib/libudev.so
使用此方法 可以完全清除此病毒。
1.3 注意事项
/proc里面的东西是可以更改的;lsof还比较忠诚,不直接读取/proc里面的信息,ps看到的就不一定真实,top看到的进程还是正确的。 附:find -o参数就是逻辑运算的or
相关参考:centOS教程
The above is the detailed content of How to implement CentOS to continuously send out packages. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics











Backup and Recovery Policy of GitLab under CentOS System In order to ensure data security and recoverability, GitLab on CentOS provides a variety of backup methods. This article will introduce several common backup methods, configuration parameters and recovery processes in detail to help you establish a complete GitLab backup and recovery strategy. 1. Manual backup Use the gitlab-rakegitlab:backup:create command to execute manual backup. This command backs up key information such as GitLab repository, database, users, user groups, keys, and permissions. The default backup file is stored in the /var/opt/gitlab/backups directory. You can modify /etc/gitlab

The CentOS shutdown command is shutdown, and the syntax is shutdown [Options] Time [Information]. Options include: -h Stop the system immediately; -P Turn off the power after shutdown; -r restart; -t Waiting time. Times can be specified as immediate (now), minutes ( minutes), or a specific time (hh:mm). Added information can be displayed in system messages.

The key differences between CentOS and Ubuntu are: origin (CentOS originates from Red Hat, for enterprises; Ubuntu originates from Debian, for individuals), package management (CentOS uses yum, focusing on stability; Ubuntu uses apt, for high update frequency), support cycle (CentOS provides 10 years of support, Ubuntu provides 5 years of LTS support), community support (CentOS focuses on stability, Ubuntu provides a wide range of tutorials and documents), uses (CentOS is biased towards servers, Ubuntu is suitable for servers and desktops), other differences include installation simplicity (CentOS is thin)

Improve HDFS performance on CentOS: A comprehensive optimization guide to optimize HDFS (Hadoop distributed file system) on CentOS requires comprehensive consideration of hardware, system configuration and network settings. This article provides a series of optimization strategies to help you improve HDFS performance. 1. Hardware upgrade and selection resource expansion: Increase the CPU, memory and storage capacity of the server as much as possible. High-performance hardware: adopts high-performance network cards and switches to improve network throughput. 2. System configuration fine-tuning kernel parameter adjustment: Modify /etc/sysctl.conf file to optimize kernel parameters such as TCP connection number, file handle number and memory management. For example, adjust TCP connection status and buffer size

Steps to configure IP address in CentOS: View the current network configuration: ip addr Edit the network configuration file: sudo vi /etc/sysconfig/network-scripts/ifcfg-eth0 Change IP address: Edit IPADDR= Line changes the subnet mask and gateway (optional): Edit NETMASK= and GATEWAY= Lines Restart the network service: sudo systemctl restart network verification IP address: ip addr

Common problems and solutions for Hadoop Distributed File System (HDFS) configuration under CentOS When building a HadoopHDFS cluster on CentOS, some common misconfigurations may lead to performance degradation, data loss and even the cluster cannot start. This article summarizes these common problems and their solutions to help you avoid these pitfalls and ensure the stability and efficient operation of your HDFS cluster. Rack-aware configuration error: Problem: Rack-aware information is not configured correctly, resulting in uneven distribution of data block replicas and increasing network load. Solution: Double check the rack-aware configuration in the hdfs-site.xml file and use hdfsdfsadmin-printTopo

Building a Hadoop Distributed File System (HDFS) on a CentOS system requires multiple steps. This article provides a brief configuration guide. 1. Prepare to install JDK in the early stage: Install JavaDevelopmentKit (JDK) on all nodes, and the version must be compatible with Hadoop. The installation package can be downloaded from the Oracle official website. Environment variable configuration: Edit /etc/profile file, set Java and Hadoop environment variables, so that the system can find the installation path of JDK and Hadoop. 2. Security configuration: SSH password-free login to generate SSH key: Use the ssh-keygen command on each node

CentOS will be shut down in 2024 because its upstream distribution, RHEL 8, has been shut down. This shutdown will affect the CentOS 8 system, preventing it from continuing to receive updates. Users should plan for migration, and recommended options include CentOS Stream, AlmaLinux, and Rocky Linux to keep the system safe and stable.
