[REVS] An Overview of UNIX Rootkits

From: support@securiteam.com
Date: 03/19/03

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Date: 19 Mar 2003 13:58:06 +0200

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      An Overview of UNIX Rootkits
    ------------------------------------------------------------------------

    SUMMARY

    Rootkits, as we know them now, came into being sometime in the mid 1990s.
    At that time, Sun operating system UNIX system administrators started
    seeing strange server behavior, missing disk space, CPU cycles and network
    connections that strangely did not show up in command netstat. By
    implementation technology, three main classes of Rootkits are available
    today: binary kits, kernel kits and library kits. The first class achieves
    its goal by replacing certain system files with their Trojan counterparts.
    The second uses kernel components (also called modules) or Trojans, and
    the third employs system library Trojans. Rootkits found in the wild (such
    as captured on Honeypots), often combine Trojaned binaries with higher
    "security" provided by the kernel and library components.

    DETAILS

    The following linked paper will give an overview of the Rootkits
    functionality, the different types of Rootkits, and some case studies of
    captured Rootkits.

    ADDITIONAL INFORMATION

    The paper is available for download at:
    <http://www.idefense.com/idpapers/Rootkits.pdf>
    http://www.idefense.com/idpapers/Rootkits.pdf.

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    Relevant Pages

    • Re: Rootkits coming to a Mac near you
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      (comp.sys.mac.advocacy)
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