[TOOL] StMichael - LKM Rootkit Detector
From: SecuriTeam (support_at_securiteam.com)
Date: 11/01/05
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To: list@securiteam.com Date: 1 Nov 2005 16:27:27 +0200
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StMichael - LKM Rootkit Detector
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SUMMARY
DETAILS
StMichael is a LKM that attempts to provide a level of protection against
kernel-module rootkits. It provides this protection by monitoring various
portions of the kernel, and optionally the entire kernel text itself, for
modifications that may indicate the presence of a malicious kernel module.
If rootkit-like activity is detected, StMichael will attempt to recover
the kernel's integrity by rolling back the changes made to a previously
known-good state.
The following is a brief list of the capabilities of the StMichael kernel
module:
* Can generate and check MD5, and optionally SHA1, checksum of various
kernel data structures, such as the system call able, and filesystem call
out structures
* Can checksum (md5 only) the base kernel, and detect modifications to
the kernel text such as would occur during a silvo-type attack.
* Can backup a copy of the kernel, storing it in a weekly encrypted form,
for later restoration if a catastrophic kernel compromise is detected.
* Can detect the presence of simplistic kernel rootkits upon loading.
* Can modify the Linux kernel to protect immutable files from having
their immutable attribute removed.
* Can disable write-access to kernel memory through the /dev/kmem device.
* Can conceal the Stmichael module and its symbols.
* Can monitor kernel modules being loaded and unloaded to detect attempts
to conceal the module and its symbols, and attempt to 'reveal' the hidden
module.
StMichael works on Linux kernel, and can be downloaded at:
<http://prdownloads.sourceforge.net/stjude/StMichael_LKM-0.12.tar.gz?download> http://prdownloads.sourceforge.net/stjude/StMichael_LKM-0.12.tar.gz?download
ADDITIONAL INFORMATION
The information has been provided by <mailto:rodrigo@kernelhacking.com>
Rodrigo Rubira Branco.
To keep updated with the tool visit the project's homepage at:
<http://sourceforge.net/projects/stjude>
http://sourceforge.net/projects/stjude
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