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This ability to change the way an operating system behaves is a key concept of LKMs It was not long before attackers recognized that LKMs afforded them the ability to change the behavior of each command a system administrator executed What a great mechanism for a rootkit! Rogue LKMs installed by attackers can intercept system commands such as netstat, ifconfig, ps, ls, and lsmod and lie about the results The attacker s LKM rootkits accomplish this by intercepting the system calls the victim system makes LKMs can hide files and processes, and they can also create illicit backdoors on a system All operating systems provide access to kernel structures and functions through the use of system calls This means that whenever an application or command needs to access a resource the computer manages via the kernel, it will do so through system calls System calls are made for practically every command a user types! LKM rootkits such as knark, adore, and heroin provide quite a challenge to investigators The typical system administrator who uses any user space tools (any normal Unix commands) to query running processes could overlook critical information during the initial response

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You respond to a suspected intrusion The system administrator has detected and captured traffic that suggests someone is using a sniffer on your system You mount your trusted toolkit and begin your response Your ps listings don t reveal anything suspicious; yet, other evidence leads you to believe that a sniffer is running

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The Thesaurus, previously a Word-only feature, is now available in PowerPoint You can mark up your slides in ink with a pen/tablet device, writing comments

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The attacker may have installed an LKM When an attacker has control of the system at the kernel level, she can force user-level programs, such as ps, to return false information One tool that may have been used is knark This Linux LKM trojan allows an attacker to hide any process she desires Once the LKM is installed, the attacker simply sends a signal 31 (via kill 31) to the process she wants to hide The knark LKM takes care of the rest The only way to work around an LKM is to have one in your toolkit Also, you might want to obtain kstat, which is a very handy tool for detecting rootkit modules

GO GET IT ON THE WEB kstat: http://wwws0ftpjorg/en/sitehtml adore rootkit: http://wwwteam-tesonet knark LKM rootkit: http://packetstormsecuritynl/UNIX/penetration/rootkits/knark-243tgz Interview with the author of knark: http://jclemensorg/knark/creed_interview1html Solaris LKMs: http://packetstormsecuritynl/groups/thc/slkm-10html Linux LKMs Tutorial: http://wwwddjcom/articles/1995/9505/9505a/9505ahtm topic=unix

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Unix has a myriad of logs that seem to be scattered on the file system in a completely random fashion Adding to the complexity, system administrators can easily change the name and location of these logs to suit their needs Most Unix flavors keep their log files in /var/adm or /var/log subdirectories You will need to be familiar with each variant and know where the logs are stored In 13, we cover the locations and purposes of Unix logging Here, we concentrate on the retrieval of the log files We use a combination of netcat, cryptcat, dd, and des to obtain the log files on a system At a minimum, you want to acquire the three binary log files and the common ASCII text log files The following binary log files are of particular interest: M I I L The utmp file, accessed with the w utility The wtmp file, accessed with the last utility The lastlog file, accessed with the lastlog utility Process accounting logs, accessed with the lastcomm utility

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