02-24-2017
Hi,
The error messages you got from 'ls' would mean that that PID 4600 no longer exists - in other words, the process with ID 4600 has since exited. These kinds of things only tend to hang around for so long, and you really need to catch them right in the act to have any decent chance of easily tracking them down. If you see any other suspicious processes still (to recap, that would be processes owned by 'apache' but which claim to be anything other than 'httpd') then have a look at their entries in the /proc filesystem in the same way. But most likely it's all over and done with by now.
Unfortunately, the bigger problem you have here is not in fact the rogue scripts themselves, but the question of how they came to be on your system in the first place. In my experience, an attacker finds something they can exploit, like a file upload form without sufficient security protection, or some other script that they can exploit to make it upload things to a globally-writable location on the server. Once they upload their script, they then run it, it hangs about for a bit while it does its thing, then exits.
So the more important thing you have to do here is figure out how the attackers got these scripts on your system. The fact that they might still be somewhere on your server is certainly a problem, but a bigger problem is the fact that they were able to be on your server at all in the first place. In all likelihood you have a security hole somewhere that could be exploited by the same attacker again, or an entirely different attacker in the future.
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LEARN ABOUT CENTOS
emergencyanalysis_event.conf
EMERGENCYANALYSIS_EV(5) LIBREPORT MANUAL EMERGENCYANALYSIS_EV(5)
NAME
emergencyanalysis_event.conf - configuration file for libreport.
DESCRIPTION
This configuration file defines events for the emergency analysis. These events are supposed to be used when the standard reporting process
fails.
By default the file contains definition for report_EmergencyAnalysis event applicable for all problem types.
report_EmergencyAnalysis event configuration file
The configuration for report_EmergencyAnalysis event is read from /etc/libreport/events/report_EmergencyAnalysis.conf file if exists.
The configuration file contains values for options defined in /usr/share/libreport/events/report_EmergencyAnalysis.xml
Configuration file lines should have PARAM = VALUE format. The parameters are:
Upload_URL
Configured upload URL
http_proxy
the proxy server to use for HTTP
HTTPS_PROXY
the proxy server to use for HTTPS
FTP_PROXY
the proxy server to use for FTP
EXAMPLE
The following example shows a possible configuration of report_EmergencyAnalysis event. In this particular case the event execution uploads
an archive with all problem data to configured URL.
EVENT=report_EmergencyAnalysis reporter-upload
SEE ALSO
report_event.conf(5), reporter-upload(1)
AUTHOR
o ABRT team
LIBREPORT 2.1.11 06/18/2014 EMERGENCYANALYSIS_EV(5)