System Service Descriptor Table: Difference between revisions

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== Hooking ==

Modification of the SSDT allows to redirect syscalls to routines outside the kernel. These routines can be either used to hide the presence of software or to act as a backdoor to allow attackers permanent code execution with kernel privileges. For both reasons, [[Hooking|hooking]] SSDT calls is often used as a technique in both Windows [[rootkit|kernel mode rootkits]] and [[antivirus software]].<ref>{{Cite web|url=httphttps://wwwcommunity.symantecbroadcom.com/connectsymantecenterprise/articlescommunities/windowscommunity-rootkitshome/librarydocuments/viewdocument?DocumentKey=a3624787-2005b8a3-part42f6-oneb33a-3f30181c4ce6&CommunityKey=1ecf5f55-9545-44d6-b0f4-4e4a7f5f5e68&tab=librarydocuments|title= Windows rootkits of 2005, part one|work=Symantec|year=2005}}</ref><ref name="ZDNET2010">{{Cite web|url=https://www.zdnet.com/article/attack-defeats-most-antivirus-software/ |year=2010|title=Attack defeats 'most' antivirus software|work=ZD Net UK}}</ref>

In 2010, many computer security products which relied on hooking SSDT calls were shown to be vulnerable to [[Exploit (computer security)|exploits]] using [[race condition]]s to attack the products' security checks.<ref name="ZDNET2010"/>