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linux - Weird SSH, Server security, I might have been hacked



I am not sure if I've been hacked or not.



I tried to log in through SSH and it wouldn't accept my password. Root login is disabled so I went to rescue and turned root login on and was able to log in as root. As root, I tried to change the password of the affected account with the same password with which I had tried to log in before, passwd replied with "password unchanged". I then changed the password to something else and was able to log in, then changed the password back to the original password and I was again able to log in.




I checked auth.log for password changes but didn't find anything useful.



I also scanned for viruses and rootkits and the server returned this:



ClamAV: 



"/bin/busybox Unix.Trojan.Mirai-5607459-1 FOUND"


RKHunter: 




"/usr/bin/lwp-request Warning: The command '/usr/bin/lwp-request' has been replaced by a script: /usr/bin/lwp-request: a /usr/bin/perl -w script, ASCII text executable

Warning: Suspicious file types found in /dev:"


It should be noted that my server isn't widely known. I have also changed the SSH port and enabled 2-step verification.



I am worred I got hacked and someone is trying to fool me, "everything is fine don't worry about it".


Answer




Like J Rock, I think this is a false positive. I had the same experience.



I received an alarm from 6 different, disparate, geographically separated servers in a short time span. 4 of these servers only existed on a private network. The one thing they had in common was a recent daily.cld update.



So, after checking for some of the typical heuristics of this trojan without success, I booted a vagrant box with my known clean baseline and ran freshclam. This grabbed




"daily.cld is up to date (version: 22950, sigs: 1465879, f-level: 63,
builder: neo)"





A subsequent clamav /bin/busybox returned the same "/bin/busybox Unix.Trojan.Mirai-5607459-1 FOUND" alert on the original servers.



Finally, for good measure, I also did a vagrant box from Ubuntu's official box and also got the same "/bin/busybox Unix.Trojan.Mirai-5607459-1 FOUND" (Note, I had to up the memory on this vagrant box from its default 512MB or clamscan failed with 'killed')



Full output from fresh Ubuntu 14.04.5 vagrant box.



root@vagrant-ubuntu-trusty-64:~# freshclam
ClamAV update process started at Fri Jan 27 03:28:30 2017
main.cvd is up to date (version: 57, sigs: 4218790, f-level: 60, builder: amishhammer)

daily.cvd is up to date (version: 22950, sigs: 1465879, f-level: 63, builder: neo)
bytecode.cvd is up to date (version: 290, sigs: 55, f-level: 63, builder: neo)
root@vagrant-ubuntu-trusty-64:~# clamscan /bin/busybox
/bin/busybox: Unix.Trojan.Mirai-5607459-1 FOUND

----------- SCAN SUMMARY -----------
Known viruses: 5679215
Engine version: 0.99.2
Scanned directories: 0
Scanned files: 1

Infected files: 1
Data scanned: 1.84 MB
Data read: 1.83 MB (ratio 1.01:1)
Time: 7.556 sec (0 m 7 s)
root@vagrant-ubuntu-trusty-64:~#


So, I also believe this is likely to be a false positive.



I will say, rkhunter did not give me the: "/usr/bin/lwp-request Warning" reference, so maybe PhysiOS Quantum is having more than one issue.




EDIT: just noticed that I never explicitly said that all of these servers are Ubuntu 14.04. Other versions may vary?


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