By Brian Wotring, Bruce Potter, Marcus J. Ranum
This e-book will stroll the reader in the course of the strategy of getting ready and deploying open resource host integrity tracking software program, particularly, Osiris and Samhain. From the configuration and install to upkeep, trying out, and fine-tuning, this e-book will disguise every little thing had to appropriately installation a centralized host integrity tracking resolution. The area contains domestic networks on as much as large-scale company environments. during the publication, life like and useful configurations may be supplied for universal server and computer structures. through the tip of the e-book, the reader won't basically comprehend the strengths and boundaries of host integrity instruments, but additionally know how to successfully utilize them on the way to combine them right into a safeguard coverage. * Brian Wotring is the writer of Osiris. He speaks and writes usually on Osiris for significant magazines, websites, and alternate exhibits. And, the publication will be prominently advertised from the Osiris website * this is often the 1st e-book released on host integrity tracking, regardless of the frequent deployment of Osiris and Samhain * Host Integrity tracking is the single strategy to safely be sure if a malicious attacker has effectively compromised the protection measures of your community
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Is it monetary loss? Is it a breach of privacy? Is it public humiliation? These risks are subjective and in turn are hard to quantify. As a result, it is difficult to assess whether the return on investment (ROI) for HIM is justifiable. Another thing to consider with respect to ROI is how much administrative effort your environment requires. If you have thousands of hosts that are configured the same, it may be easy to deploy and maintain agent-based monitoring software. However, if you have many disparate configurations, the administrative costs of setup, deployment, fine-tuning, and response may be overwhelming.
A log analysis application or a HIPS may prove more helpful in this example. The process is rather simple. An attacker would replace any executables with Trojans. The problem here is that the attacker must make sure that any files tampered with are restored whenever the agent conducts a scan. If the agent’s scans are periodic, it is a more cumbersome issue and the attack may be successful. Some HIM systems purposely conduct scans on an irregular basis for this very reason. They may be providing a safe house for Trojan executables, or providing unauthorized backdoor access to sensitive information.
The idea is basically the same for all: intercept and bend the function of system calls to hide anything and everything. There are many different kinds of rootkits, and using one to subvert a HIM system is very effective, though not necessarily as easy as some of the aforementioned subversion methods. The basic idea is that the kernel is modified to intercept specific system calls that are then redirected to perform whatever the attacker wishes. Even if you have trusted executables on read-only media, they cannot be trusted once the kernel has been compromised.