Is there a GUI tool to log and view outgoing CURL requests from a Linux server? [duplicate]

Question

I've seen several similar questions - but none that truly answer the question. So here goes:

PROBLEM: A script is being run on one of our servers that is making outgoing post (and other) requests that we suspect is using CURL. It is attempting to find holes in other servers - in this case specifically in servers running WordPress, but there have been other requests.

QUESTION: Is there a GUI tool that can be used to monitor and view the source of these requests so that we can isolate the script and shut it down?

We are running an AWS instance, we do have Webmin available (if that's helpful) and this is a production machine that cannot be significantly slowed or have its normal traffic impeded.

Thanks to all, in advance, for the help!

Answer 1

I know that you are looking for GUI, but there is no GUI with magic button "SHOW ME WHO HACKED ME". This isn't TV, this is system administration. You need to use proper tools.

For starters, you can block all outgoing communication its destination port is 80 via iptables:

iptables -t filter -A OUTPUT -p tcp --dport 80 -j DROP

This will drop ALL communication no matter which process tried to start it. Then you can start playing with netstat and ps to find, which process does the bad stuff on your precious machine:

netstat -np | grep ^tcp | grep ":80"

On my machine, the result of command above is this:

tcp        0      0 192.168.1.2:34831       185.31.17.246:80        ESTABLISHED 22640/spotify   
tcp        0      0 192.168.1.2:48809       104.16.105.85:80        ESTABLISHED 10572/iceweasel

As you can see, only two processes communicate via HTTP with some servers - iceweasel and spotify. The last column is [process_number]/[process_name]. With this, you can query ps and get the actual process:

ps axu | grep 22640

Again, on my machine, it says (shortified) this:

mkudlac+ 22682  0.2  2.0 1003656 123440 ?      Sl   09:12   0:31 /opt/spotify/spotify-client/Data/SpotifyHelper --type=renderer --js-flags=--harmony-proxies --no-sandbox --lang=en-US --lang=en-US --locales-dir-path=/opt/spotify/spotify-client/Data/locales --log-severity=disable --resources-dir-path=/opt/spotify/spotify-client/Data --disable-accelerated-2d-canvas --disable-accelerated-video-decode --channel=22640.1.2031916850

Now I know path to executable and user it runs under.

To combine all this to "simple" one liner:

netstat -np | awk '/^tcp/{print $5 "/" $7}' | grep ":80" | awk -F'/' '{print $1; if ($2 != "-") system("ps axu | grep " $2 " | grep -v grep"); print "================"; }'

The result on my machine shows this:

104.16.104.85:80
mkudlac+ 10572  6.3  6.5 1016592 401108 ?      Sl   11:38   2:18 iceweasel http://serverfault.com/questions/715556/is-there-a-gui-tool-to-log-and-view-outgoing-curl-requests-from-a-linux-server
================

First line is destination IP address. Second line is full information about rogue process. Third line is delimiter to optically divide huge output.

These commands (at least netstat and ps) needs to be executed under root. When you clear your machine, you can delete the blocking iptables command with:

iptables -t filter -D OUTPUT -p tcp --dport 80 -j DROP

EDIT:

To be able to leave this script unattended and logging into file, you can alter it this way:

while (true); do netstat -np | awk '/^tcp/{print $5 "/" $7}' | grep ":80" | awk -F'/' '{print $1; if ($2 != "-") system("ps axu | grep " $2 " | grep -v grep"); print "================"; }' | tee -a hack.log; sleep 30; done

This will check for rogue connections every 30 seconds and write it to hack.log file.

Answer 2

I suggest Burp suite Fiddler and Wireshark for deeper analyzing.

Answer 3

I would also like to propose "iftop", this can be usefull to get existing connections from your machine: It listens to network traffic on a named interface and displays a table of current bandwidth usage by pairs of hosts