admin Introduction ModSecurity is an open-source Web Application Firewall (WAF) for Apache, Nginx and IIS web server. This application layer firewall is developed by Trustwave’s SpiderLabs and released under Apache License 2.0. ModSecurity protects websites from hackers by using a set of regular expression rules to filter out commonly known exploits, it allows HTTP traffic monitoring, … Read more
In this article, we will go over the basics of ModSecurity rule writing and also provide ModSecurity rule examples. In case you are new to ModSecurity, we also have an informative article: What is ModSecurity and why do we need it? ModSecurity Rule Writing The ModSecurity Reference Manual should be consulted in any cases where … Read more
Login to DirectAdmin server via SSH as the root user or sudo to get root access. Execute the below commands: Output install.sh script Remove unused gzipped tar file You can run a Linux Malware Detect scan now, it would run with no problem. However, it would not include ClamAV’s definitions, if you not before installed … Read more
This is very old malware, Timestamp December 2015 and in Joomla /cache/cache-db.php or /libraries/simplepie/simplepie.lib.php file. This is very cleverly made, and hide assert PHP execution inside the code. First time look source code, it looks like normal file. But when look better and trace first extra code Second hidden code added Third hidden code added … Read more
ssh If possible, don’t allow user login ssh to the server. Also disable root user login and use sudo to gain root access. Change: Restart ssh server! Note: Make sure you installed sudo and sudoers to your user! Filesystem You can prevent and hide access certain folders and files. php.ini There are certain functions in … Read more
Prerequisite If you dont have custombuild or version is 1.x, you need first upgrade to custombuild 2.x. Upgrade instruction https://help.directadmin.com/item.php?id=555 Update Custombuild Update custombuild: Configuration Edit options.conf file and change these lines to below: Build ClamAV scanner Optional can use Malware Expert ClamAV Signatures and Linux Malware Detect Build ModSecurity Mod_Security Rules In options.conf possible … Read more
During analysis of our logs we noticed that an automated attack against PHP is going on, using a vulnerability in PHP. Attacker is trying to make use of CVE-2012-1823, this only applies if your PHP is used in CGI mode (mod_php is not vulnerable to this). POST /%70%68%70%70%61%74%68/%70%68%70?%2D%64+%61%6C%6C%6F%77%5F%75%72%6C%5F%69%6E%63%6C%75%64%65%3D%6F%6E+%2D%64+%73%61%66%65%5F%6D%6F%64%65%3D%6F%66%66+%2D%64+%73%75%68%6F%73%69%6E%2E%73%69%6D%75%6C%61%74%69%6F%6E%3D%6F%6E+%2D%64+%64%69%73%61%62%6C%65%5F%66%75%6E%63%74%69%6F%6E%73%3D%22%22+%2D%64+%6F%70%65%6E%5F%62%61%73%65%64%69%72%3D%6E%6F%6E%65+%2D%64+%61%75%74%6F%5F%70%72%65%70%65%6E%64%5F%66%69%6C%65%3D%70%68%70%3A%2F%2F%69%6E%70%75%74+%2D%6E Decoding the URL gives: Using -d parameter … Read more
When you scan server files with Clamdscan or Maldet your scanner give postitive result and Extra ClamAV signatures to better ratio detect malware. We using clamdscan scanner to scan files. Example user www files: Now we open content-none.php file to look better: The first looks, there is no anything, but if you look better first … Read more
Login to cPanel server via SSH as the root user. Execute the below commands: Output install.sh script Remove unused gzipped tar file You can run a Linux Malware Detect scan now, it would run with no problem. However, it would not include ClamAV’s definitions, if you not before installed ClamAV scanner. Maldet without installed ClamAV … Read more
In ModSecurity auditlog we found magento webforms upload vulnerability. Looking better POST payload, found this image.phtml script, which first uploaded to customer website. If index.php / image.phtml file success uploaded, it can access from www and executed! image.phtml First it send email to fileputcontent@gmail.com notify details like Hostname, URL, IP: Then it try … Read more