|Image 1: The red arrow below shows the difference between the life span of typical malicious injected code and code injected by a rogue Apache module
We are seeing an increase in the number and sale of web server rootkit tools which are used to inject and hide malicious code on compromised web servers. Web server administrators are mentioning on forums and blog articles of mysterious iframes with malicious payloads, magically appearing on different websites and constantly changing the injected URL.
According to underground forums this type of web server rootkit called “DarkLeach” is an Apache 2 module selling for $1,000. Features of this module include: iFrame injection of php/html/js files, allowing access to module from specific IP addresses, periodic updates of injected URLs.
Apart from injecting iFrames, this module ensures a long life span with it’s stealth mode features, including logging the IP addresses of server administrators, going quiet when the admin logs into the server or when someone connects to the server with the logged IPs, disabling the module when a system scanner such as rkhunter or tcpdump are used.
The author of the module goes on to show the statistics of how successful this module is when used with exploit kits:
|Image 2: Stats from exploit kits showing successful exploits with the help of the Web server Apache rogue module
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