C99Shell :: How To Detect Or Disable The Functionality Of C99Shell

Jul 13, 2008

Recently my site was defaced, (i own a dedicated server), my server was not touched, but one of the applications I used on the site was exploited to gain access to it.

I have noticed 4 or 5 c99 shells in different locations on my ftp. The site is back online, but it's definitely possible that they have one of these hidden somewhere and that they'll just do it again. I am using cent os 5

How can I easily search for these on my box? Can I disable their functionality? is there setting I can use in htaccess or something to make my website safer? I visited one of the scripts, and it said SAFEMODE OFF, how can I at least enable safemode?

I don't know much of anything about linux, but I am running cpanel and WHM. I have a guy who manages my box but he is hard to get a hold of sometimes, and I'd like to take care of this ASAP!

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C99Shell :: Detect And Disable C99 Shell?

Aug 15, 2008

how i can detect and disable C99 shell and another shell script exp:r57 ....

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C99shell Disable PHP Scripts?

Sep 3, 2007

the biggest security issue i have with my clients is php c99 shell and similar php files, somehow these files uploaded on the website and from here they start attacking the websites.
i have seen also that once you upload the c99 php file you are able to see the accounts information ( such as a user name ) on the same server

so is there any way to disable this kind of php file or at least disable some function within the file!

i have been thinking to install and run a antivirus on the server , but i see sometimes they upload the encrypted version of the file , so the antirus can't catch the file as a torjan!

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C99Shell Folders?

Jul 30, 2009

I found these folders in the root




what are these ? is it normal folders ? or somebody hacked our server?

what shall I do?

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Trojan C99Shell

Jul 1, 2009

I just installed zen cart on my webhosting and after few days later i saw some file written like core1405.php and when i open to view the file it is actually trojan c99shell.

I have deleted all of the core file. Now how can i prevent it from happen again? Cause it is too much work to clean up the hosting server.

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C99Shell How To Stop

Nov 5, 2009

How to stops the scripts like c99 shell from installing into the server?

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Mod_security & C99shell Anyone Help Please ?

Jun 5, 2007

I installed modsecurity from Addone module in Cpanel

When I try to apply phpshell woork good without a mistakes and I can do anything despite of the presence of protection modsecurity and disable_functions in php.ini.

Is there a particular settings add to the httpd.conf to prevent application phpshell or prevent upload it to the site?

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C99Shell Hackers Killing Me!

Jun 25, 2007

guys im tired off fighting those hackers everyday! i have about 20 websites,and everyday i have one of them hacked! i restore a backup then another one hacked!

thats unbelivable!!!

those bastards upload there shell scripts to websites via bugs or whatever from php files!!

is there anyway to stop these commands?

can .htaccess helps? how?

i talked to my webhosting companies for my websites! ....

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C99Shell :: Attack Rules For Mod_security

Oct 3, 2007

i want to prevent c99shell scripts from running.

I found this rule to detect URI's for the c99 shell.

#new kit
SecFilterSelective REQUEST_URI "/c99shell.txt"
SecFilterSelective REQUEST_URI "/c99.txt?"
My problem is that the hackers are being more stealthy and calling the
script some random name like .../myphpstuff.php. So the URI no longer helps detect it.

How could I detect "c99shell" in the actual file that apache servers? This assumes that the hacker was successfully in installing it.

my box

Apache 1.3.37
WHM 11.2.0 cPanel 11.11.0-R16983
FEDORA 5 i686 - WHM X v3.1.0

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C99Shell Stop Shell Hacking Totally?

Oct 19, 2007

Is there a way to stop them totally? i.e. even though they are successfully uploaded but I do not want the source to be available to them etc.?

I mean, is there a way to hide or not allow them to execute any shell?

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C99Shell :: Protect My Server For Shell Attacks Via C99 And H57?

Sep 1, 2008

I have few scripts, but hackers again upload at some way c99, and hack some SMF forums at server. Server like server they cannot hack, but user account they can. So please tell me what you advice?

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Would You Like To Monitor Your Web Forms Functionality

Jul 15, 2008

Considering a web site could be completely useless without its web forms working as expected, and the uptime reports do not verify them at all, I would like to know if you people, consider it important.

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Hosts That Allow Full Mod_rewrite Functionality

Aug 8, 2007

What popular hosts allow full mod_rewrite functionality via an .htaccess file?

Particularly, something like this:

RewriteRule ^avatars/([^.]*.(jpg|jpeg|png|gif|swf))$ imghost.php?fn=$1&dir=avatars [NC,L]
Hosts that allow it:
- Dreamhost
- Hostgator

Hosts that don't allow it:
- Godaddy
- 1&1 / 1and1

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Important MySQL Monitoring Functionality.

Dec 10, 2007

What this does is amongst others is to add "SHOW USER_STATISTICS"
statement do MySQL. What this does is keep statistics on which users on your mysql machine is spending the most time processing queries.

It is also mentioned here: [url]

If you believe this functionality could be important to our industry you are more than welcome to vote for this or add comments to the following feature request:


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Mod_security Functionality Bypass Through .htaccess Issue

May 5, 2007

I accidently found that it could be available to de-activate mod_security in a certain directory by using a .htaccess like that...

<IfModule mod_security.c>
SecFilterEngine Off
SecFilterScanPOST Off

I believe it's something related to the "AllowOverride" directive from apache but im not exactly sure, the available arguments for this directive are "AuthConfig, FileInfo, Indexes, Limit, Options", I've tried hardly to find a way to not to disable the usage of .htaccess files and keep it's functionality but also to prevent it from being able to modify through it the functionality of mod_security.

I'm sure Anyone here could help me in this issue as it's a big pain for any server running apache in a shared vhosting environment.

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How To Detect Spamming

Apr 21, 2009

How do you know your clients are sending bulk/spam emails?

I don't seem to understand the reports in "Email >> View Mail Statistics" section of WHM.

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Detect Memory

Jul 25, 2009

I have a private vps server works under linux ( centos ), sometimes am getting msg from csf/firewall subject:

lfd on website.com: Suspicious process running under user user account

when i check my cpanel/whm vps ( service status ) its shows that the memory limit 80% - 85% , It's had a good forum works with vb, but am wonder how to check my vps memory, i mean how to detect if there any script, or malware, or anything takes the vps memory out...

Is there any way to check,know what works under my vps, so it's take my memory limit 85%?

i check the tmp folder,

root@www [/home]# cd /tmp
root@www [/tmp]# ls -la
total 364
drwxrwxrwt 6 root root 4096 Jul 25 02:14 ./
drwxr-xr-x 21 root root 4096 Jul 18 02:21 ../
drwxrwxrwt 2 root root 4096 Jun 30 05:50 .ICE-unix/
drwxrwxrwx 18 root root 4096 Jul 2 17:33 eaccelerator/
lrwxrwxrwx 1 root root 27 Jul 18 02:13 mysql.sock -> ../var/lib/mysql/mysql.sock=
drwxr-xr-x 3 root root 4096 Jun 30 05:29 pear/
drwx------ 3 root root 4096 Jul 5 18:31 spamd-23647-init/
-rw------- 1 root root 343335 Jul 19 02:50 whatis.bk6140
root@www [/tmp]# cd /home
and the df space

root@www [~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/simfs 80G 4.1G 76G 6% /
root@www [~]#
and the services running is

root 1 0.0 0.0 2060 156 ? Ss Jun30 1:23 init [3]
root 7465 0.0 0.0 2444 156 ? S Jul03 0:00 /bin/sh /usr/bin/mysqld_safe --datadir=/var/lib/mysql --pid-file=/var/lib/mysql/www.website.com.pid
mysql 7491 0.0 2.5 33452 10440 ? Sl Jul03 11:33 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/www.website.com.pid --skip-external-locking
root 10236 0.0 6.0 27396 24764 ? Ss Jul24 0:07 /usr/bin/spamd -d --allowed-ips= --pidfile=/var/run/spamd.pid --max-children=3 --max-spare=1
root 11447 0.0 1.9 18364 8020 ? S Jul24 0:00 cpsrvd - waiting for connections
root 11865 0.0 0.7 13672 3260 ? S Jul06 0:00 /usr/local/apache/bin/httpd -k start -DSSL
root 13537 0.0 3.1 15092 13064 ? Ss 00:00 0:02 lfd - sleeping
root 13703 0.0 0.3 3808 1284 ? SN Jul06 0:01 cpanellogd - sleeping for logs
root 13739 0.0 0.6 5856 2844 ? Ss Jul06 0:00 cPhulkd - processor
root 13795 0.0 1.5 14760 6304 ? S Jul06 0:00 cpdavd - accepting connections on 2077 and 2078
root 18161 0.0 0.0 1716 380 ? Ss Jun30 0:24 syslogd -m 0
root 18164 0.0 0.0 1668 72 ? Ss Jun30 0:00 klogd -x
dbus 18193 0.0 0.0 2736 212 ? Ss Jun30 0:00 dbus-daemon --system
root 18213 0.0 0.0 2716 172 ? Ss Jun30 0:00 xinetd -stayalive -pidfile /var/run/xinetd.pid
root 18399 0.0 5.9 27604 24404 ? S Jul24 0:06 spamd child
root 19461 0.0 0.1 3228 684 ? Ss Jun30 0:08 crond
root 19616 0.0 0.0 1820 124 ? Ss Jun30 0:00 /usr/sbin/portsentry -

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How To Detect Flood Ftp

May 4, 2008

My server run after 10h sevices ftp is down (network error: connection timed out). may be flood ftp.

how to Detect flood ftp.

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How-to Detect A Possible Intruder ┐?

May 22, 2007

I have a few incomplete steps to see if I got some intruder in my Linux system.. But i really would like to have all your suggestions to make a good doc about this matter,

1.- Download and run Rkhunter & Chkrootkit
2.- Run "w", and "netstat -nalp |grep "SHPORTHERE" to see whos connected using SSH
3.- Search for ssh and ftp accepted logins.

cat /var/log/secure* | grep ssh | grep Accept
cat /var/log/secure* |grep ftp |grep Accept
less /var/log/messages | grep ftp
4.- Watch current connections and scan your ports.

netstat -nalp
nmap 1-65535 localhost
5.- Search for suspicious content on common explotable dirs.

rm -rf /tmp/sess*
rm -rf /var/dos-*
rm -rf /var/tmp/ssh-*
rm -rf /var/tmp/dos-*
ls /tmp -lab
ls /var/tmp -labR
ls /dev/shm -labR
ls /usr/local/apache/proxy -labR
ls /usr/local/samba -labR
6.- Checking for anomalies on this files.

less /etc/passwd
less /etc/shadow
less /etc/groups
7.- Search for new users at sudoers, check wtmp and telnet is not running.

cat /etc/sudoers
who /var/log/wtmp
cat /etc/xinetd.d/telnet
8.- Find bash history files

find '/' -iname .bash_history
9 .- Verify the Crontab table

crontab -l
10 .- Update the slocate database and search for exploits.

updatedb &
For cPanel servers:

egrep -i '(chr(|system()|(curl|wget|chmod|gcc|perl)%20' /usr/local/apache/logs/*
egrep -i '(chr(|system()|(curl|wget|chmod|gcc|perl)%20' /home/*/statistics/logs/*
For Ensim servers:

egrep -i '(chr(|system()|(curl|wget|chmod|gcc|perl)%20'/home/virtual/site*/fst/var/log/httpd/*
Search for shell code:

cat /path/of/your/web/logs/* |grep "/x90/"
11.- Search for hidden dirs

locate "..."
locate ".. "
rlocate " .."
locate ". "
locate " ."
12.- Search for perl-scripts running

ps -aux | grep perl
13 .- Checking nobody user and open files.

service httpd stop
lsof -u nobody

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Detect Errors On Server

Apr 6, 2009

I have a server of my own. Unfortunatlly 20% of the time, the server is down even though my connection to internet always up.

I am checking the event log but cannot see anything odd...
OS:Windows server 2003

Is there any tool to detect why the server is down most of the time?

I can post the event viewer errors that I can find suspeicious if needed.

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How To Detect A DDoS Attack ...

May 19, 2009

is there any proved method to determine what kind of attack you are under? Our server has been under attack for more than a day now but so far we have not been able to find out what kind of attack it is exactly. The server maintence company we are using says it's a DDoS attack but they don't say how they found this out. Also, they are not telling us what kind of DDoS attack it is.

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Is It Possible To Detect User's Pc Configuation

Jul 31, 2009

i have some issue,

sometimes,a user may be banned by our firewall,

or the dns of his pc does not work well,...and so on,

by the way,

they can not link to server,

and it spend a lot of time to check where is wrong from his pc aside.

i want to ask if it is possible i use a php script or a exe let him to execute,

and it will help me detect user's pc configuation,

it include his IP/DNS/fateway/trace and ping result,...and so on.

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How To Detect A VPS And Its Technology In Linux

Jul 25, 2008

Is there any way to distinguish a dedicated server from VPS using Linux commands and detect the implemented virtualization technology like XEN and OpenVZ, ...?

I have received a dedicated server and in cPanel its written Virtuozzo but they tell me it's XEN , beside this what's the reason to implement a virtualization technic while they give me a dedicated server? Maybe to obtain cheaper cPanel license,

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Host Ability To Self Detect

Nov 13, 2008

Do web hosts have the means to self-detect or self-correct problems with people's websites? If so, is there a name for this ability?

Seems that every host I've used has to be *told* about major problems, such as the server or database being down completely. I'm tired of going out of town fearing a site crash. I don't expect them to catch every problem, but when the failure is so blatant, it would be nice if they caught it...

How would I find a host who does this?

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How To Detect Is It Domain Name Server (DNS) Or Http Down?

Aug 1, 2009

If i put domain.com on uptime checker,and downtime is detected,downtime will be reported if dns is down or if http server is down.So question is what i need to do to see what exactly went down?For network uptime i can ping ip adress,but for these two i really don't know.

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Detect The Costa Rica ISP's Website

Sep 28, 2009

I know the ISP is RADIGRAFICA COSTARRICENSE, and the server location is San JosÚ in Costa Rica.

I googled the ISP name RADIGRAFICA COSTARRICENSE, trying to find out the company site which offer's web hosting service, but I can only find racsa.co.cr; however, this doesn't look like a web hosting company.

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How To Detect What Exactly Caused High Load

Aug 2, 2009

On one server which i have sometime appear very high load up to 70,and that causing downtime of few minutes(i have historic data webmin module where i saw high load and downtime time matches,but it doesn't show what causing it).That server also have hardware raid in mirror mode.(copies exact data from one disk to another).

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Hacked Vps, To Many Files, How To Detect Hacker

May 6, 2009

Sometime ago the DC told me there was too many files on server and I started to investigate what is was and i got info that some one hacked the server and was sending spam from it.

When I looked at the accounts in Direct Admin some of them had the contact email to some hacker so i deleted the emails and changed password on the DA account and the email of those accounts.

Still I got too many files all the time so the server goes down so i have to delete the spoolfile all the time like 10 times a day

Please help how do I detect from what account do the hacker operate?

Can I detect that somehow?

Is it possible to do some small script to detect this?

Is there any advanced module to DA that gives me the info?

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Detect Mail Server Software

Oct 29, 2007

How does one go about detecting what mail server software you have installed and running on your server?

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