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Prevent Of Execution Trojan Shell Scripts, Like R57shell And Other?


Which configuration for php and server that prevent execute shell scripts?

Which funstions you recommend to disable?

Like shell_exec, passthru, proc_open, proc_close, proc_get-status, proc_nice, proc_terminate, exec, system, suexec, popen, pclose, dl, ini_set, virtual, set_time_limit


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one of my client account has just been hacked with c.100 exploit. This method injects 1 php file that acts like fully featured file manager. This hacker use my client account to place multiple scam & phissing sites

now i'm wondering if this kind of exploit hacking have a way to counter them as my friend that there aren't any proved method untill now :-/

This is the php file i've recovered:
<<url removed>>

FYI, my server configuration:
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[url]
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Scan for Trojan Horses

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/dev/stderr

Scanning for Trojan Horses.....

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Is there anything that looks fishy here?

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Now the users refuses to open my website!! i'm more than worried

this is an printscreen of the error: ...

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I am not that technically proficient so I have to resort to shared hosting solutions...I am currently with Bluehost.

Problem: I have a small site with minimal needs in terms of storage and bandwidth, but the site is controversial and gets hacked and attacked a lot.

I need a shared hosting provider which ranks higher than most in terms of security.

Recently the site was attacked such that any user going to the site was infected with Trojan horse viruses.

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File generated by Rogers Online Protection Anti-Virus

C:Documents and SettingsuserLocal SettingsTemporary Internet
FilesContent.IE5PG8E0SM0gifimg[1].htm Trojan-Clicker.HTML.IFrame.amh
Deleted 11/5/2009 12:21:25 AM
C:Documents and SettingsuserLocal SettingsTemporary Internet
FilesContent.IE5GC9JZWI3gifimg[2].htm Trojan-Clicker.HTML.IFrame.amh
Deleted 11/5/2009 12:21:27 AM
C:Documents and SettingsuserLocal SettingsTemporary Internet
FilesContent.IE5QBPA1ELgifimg[1].htm Trojan-Clicker.HTML.IFrame.amh
Deleted 11/5/2009 12:21:27 AM
C:Documents and SettingsuserLocal SettingsTemporary Internet
FilesContent.IE56SLECSUQgifimg[5].htm Trojan-Clicker.HTML.IFrame.amh
Deleted 11/5/2009 12:21:28 AM
C:Documents and SettingsuserLocal SettingsTemporary Internet
FilesContent.IE5EKTEAS82gifimg[5].htm Trojan-Clicker.HTML.IFrame.amh
Deleted 11/5/2009 12:21:28 AM
C:Documents and SettingsuserLocal SettingsTemporary Internet
FilesContent.IE5P5098OY4gifimg[4].htm Trojan-Clicker.HTML.IFrame.amh
Deleted 11/5/2009 12:21:29 AM
C:Documents and SettingsuserLocal SettingsTemporary Internet
FilesContent.IE5IPGNWAB0gifimg[1].htm Trojan-Clicker.HTML.IFrame.amh
Deleted 11/5/2009 12:21:30 AM
C:Documents and SettingsuserLocal SettingsTemporary Internet
FilesContent.IE55VT8B104gifimg[1].htm Trojan-Clicker.HTML.IFrame.amh
Deleted 11/5/2009 12:21:30 AM
C:Documents and SettingsuserLocal SettingsTemporary Internet
FilesContent.IE543XUDX83gifimg[2].htm Trojan-Clicker.HTML.IFrame.amh
Quarantined 11/5/2009 12:21:31 AM
C:Documents and SettingsuserLocal SettingsTemporary Internet
FilesContent.IE56SLECSUQgifimg[5].htm Trojan-Clicker.HTML.IFrame.amh
Quarantined 11/5/2009 12:22:18 AM
C:Documents and SettingsuserLocal SettingsTemporary Internet

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[url]

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Check And Prevent Ddos Attack
While working with different issues, I have seen that many clients complaining about ddos attack on their server. So, I am posting here some useful commands to check and prevent ddos attack.

First of all when you see that your site's or server speed is very slow even though there is not much load on your server, you can guess it might be ddos. Then run 'top' command and see which processes is more, if those are httpd then fire following command
which will show how many active connections your server is currently processing.
netstat -n | grep :80 | wc -l
netstat -n | grep :80 | grep SYN |wc -l

The first command will show the number of active connections that are open to your server. The number of active connections from the first command is going to vary widely but if you are much above 500 you are probably having problems.If the second command is over 100 you are having trouble with a syn attack.

netstat -anp |grep ‘tcp|udp’ | awk ‘{print $5}’ | cut -d: -f1 | sort | uniq -c | sort -n

That will list the IPs taking the most amounts of connections to a server.

use follwoing command to block a ip with iptables on server

iptables -A INPUT 1 -s IPADRESS -j DROP/REJECT

service iptables restart

service iptables save

--------OR---------------
You can place ip's which you want to block in hosts.deny

vi /etc/hosts.deny

httpd: IP

write and quit

---------------------------

Then KILL all httpd connection and restarted httpd service by using following command

killall -KILL httpd

service httpd startssl

-----------------------------------

This are all the step to check and prevent ddos on your server.

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