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Archive | September, 2016

Securing Directadmin Server

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 […]

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Install ModSecurity to Directadmin with Custombuild 2.x

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 […]

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Bot Network Scanners Activated

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 […]

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How detect malware

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 […]

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Install Maldet cPanel Server

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 […]

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Magento Webforms Upload Vulnerability

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 […]

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