I have a unknown process when I run top:

enter image description here

  • When I kill the process it is coming again with another random name.
  • when I check the rc.d levels and init.d there are many random name similar like this one and this one is also there.
  • when I try to apt-get remove or anthing elses it is coming again.
  • when I plug in network cable it is locking our whole network.

Do you have any idea how I can remove it?

What is this service/process?

This is the exe file, when I delete it, it is coming again too.

/proc/**pid**/exe => symbolic link to /usr/bin/hgmjzjkpxa

When i check "netstat -natp" there is an establisment foreign address is 98.126.251.114:2828. When i try to add rules to iptables, it is not working. But after trying and then restart this address change to 66.102.253.30:2828 this one.

OS is Debian Wheeze

  • 5
    Probably some botnet client (your machine is compromised). You have to find out how it is started. Utilities like cruft may come in handy to see what files do not belong to packages. – Dan Feb 14 '15 at 13:40
  • 2
    ps l will show you what the parent process is. Most likely, that'll tell you what is spawning this process. Look at the PPID column for the information you want. I wouldn't be so quick to declare this malware. – krowe Feb 14 '15 at 14:02
  • +1 to check the parent process. And if the file /use/bin/hgmjzjkpxa exists (could it be in /usr?) is it also a link, or something else interesting listed in ls -la, or viewed with less or strings? – Xen2050 Feb 15 '15 at 4:02
  • there is no any parent process, it is looking like whoami process, there is one thing when i check "netstat -natp" there is an establisment foreign address is 98.126.251.114:2828. when i try to add rules to iptables, it is not working. But after trying and then restart this address change to 66.102.253.30:2828 this one. do you have any idea about this? – user1424059 Feb 17 '15 at 12:23

This is known as the XORDDos Linux Trojan The trick is to run kill with -STOP for the process to be paused so it doesn't create a new one.

`kill -STOP PROCESS_ID`
  • Great. This is exactly what I was seeking for. Without reboot you really can not get rid of this virus if it is always being in memory. You even needn't to chmod any folders after stopping it - just remove the files and links and that's all. – Oleg Bolden Jun 27 at 6:42

I have some experiences about this random 10bit string trojan, It will send lots of packets for SYN flood.

  1. Cut down your network

The trojan has raw file coming from /lib/libudev.so, it will copy and fork again. It will also add cron.hourly job named gcc.sh, then it will add initial script in your /etc/rc*.d (Debian, CentOS may be /etc/rc.d/{init,rc{1,2,3,4,5}}.d)

  1. Use root to run the script below to change the folder privileges: chmod 0000 /lib/libudev.so && rm -rf /lib/libudev.so && chattr +i /lib/

  2. Delete all /etc/rc{0,1,2,3,4,5,6,S}.d files which were created today, The name looks like S01????????.

  3. Edit your crontab, delete the gcc.sh script in your /etc/cron.hourly, delete the gcc.sh file (/etc/cron.hourly/gcc.sh) then add privileges for your crontab: sed '/gcc.sh/d' /etc/crontab && chmod 0000 /etc/crontab && chattr +i /etc/crontab

  4. Use this command to check the latest file changes: ls -lrt

If you find any suspicious files named S01xxxxxxxx (or K8xxxxxxxx), delete it.

  1. Then you should reboot without network.

Then the trojan should be cleaned and you can modify the folder privileges to the original values(chattr -i /lib /etc/crontab).

  • The instructions in this answer saved me. In spite of its age, this trojan still seems to be out in the wild. However, in step 4 there is an error, as the sed command does not actually change the file. It is simply modified, though: sed '/gcc.sh/d' /etc/crontab > /etc/crontab.fixed && mv /etc/crontab.fixed /etc/crontab && chmod 0000 /etc/crontab && chattr +i /etc/crontab. Also, according to the link in @Colin Rosenthal's answer, infection is through brute-forced ssh password of root. So, in order to prevent reinfection, change or disable root password before restarting network. – frederik Feb 11 at 11:24

I'll bet you a dollar it's https://blog.avast.com/2015/01/06/linux-ddos-trojan-hiding-itself-with-an-embedded-rootkit/ . All your symptoms are exactly as described.

For me there were two options:

  1. For the trojan which is messing with files in /usr/bin I only did this: echo > /lib/libudev.so Kill the trojan PID

  2. For the one messing with /bin (here there were always 5-10 processes running for a fraction chattr +i /bin and follow the steps mentioned by rainysia

We also faces the same issue, Our servers are also Hacked and i found that they brute forced the ssh login and got succes and injected trojan in our system .

Following are the details :

less /var/log/secure | grep 'Failed password' | grep '222.186.15.26' | wc -l 37772 started

and got access on below time : Accepted password for root from 222.186.15.26 port 65418 ssh2

And as per IP Location Finder this ip belongs to somewhere in china .

Corrective Steps : please follow steps given by : @rainysia

Preventive Steps : :

  1. According to me some notification managemnet should be there when someone tried to ssh or acces your server and fail many times .
  2. Network Rate controllers should be there if you are using any cloud platform like aws,gcp,azure etc ...
  • but first, disallow root access via ssh, disallow any ssh access with password, allow only access via ssh with keys – pietrovismara Feb 21 at 13:24

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