Kernel driver ssdt hook

The ssdt table holds the pointer to kernel functions, which are used upon. I need to hook ssdt for protection of some keys value of registry, but i cant find any useful tutorial or simple source code for this stuff. Writing drivers to perform kernel level ssdt hooking. Drivers are mapped into the memory as named sections and are then executed by a thread. Hello, i must write a driver which hooked the function zwterminateprocess.

As we now have a rough understanding on how rootkits may hook apis, lets have a look at the analysis tools. Some directly hook irp of driver below \driver\disk in device stack of \\device\\harddisk0\\dr0. My driver will hook ntterminateprocess, ntloaddriver, ntopenprocess and ntdeletevaluekey. As above shows, mov eax, 52h transfers the system call number to eax, and call syscall to trap into the kernel, then kernel will use the number 52h to find corresponding kernel function in ssdt 0. Driver will put a callback with psloadimagenotifyroutine and pscreateprocessnotifyroutine to be notified when a image is loaded or a process is created. Device driver 2 domain 1 driver development 1 esx server 1 exploit 1 grip 1 h1n1 1 hook nedir 1 irp 1 ia32 1 java 1 javascript 1 js1k 1 kernel hook 1 kernel mode 4 kernel mode driver 1 kernel mode hook 1 kernel tricks 1 kpp 2 ldap 1 ldap server sign 1 linux 1 malware analysis 2 masm32 3 mbr 1. Saving a log file you need to save a record of the original, clean, ssdt. Windows server 2003 windows server 2008 windows xp windows 7. Add visual studio 20 support to sql server data tools for business intelligence by david mcclelland. Sandboxie driver will have a list with all sandboxed. After weve downloaded and installed gmer, we can start it normally. Sql server data tools is a modern development tool that you can download for free to build sql server relational databases, azure sql databases. Ssdthook implements a driverlevel hook in ssdt table of windows system.

Changing ssdt values is called hooking and is commonly used by antivirus products and rootkits to modify system behavior. At the time there was no kernelmode hiding driver that worked on the x64 versions of windows and that was also opensource. In order to unhook ssdt in future, define some hook structs as below hookopcodes is our shellcode for x64 hook. Tutorial writing drivers to perform kernellevel ssdt. Detect and restore kernel code hooks including kernel inline hooks,patches,iat and eat hooks. Could someone explain to me, how to hook the ssdt table. For example i dont want to my program begin terminated even by the following code.

Code executed by a user runs in user mode user application and operating system code e. When unloading the driver from the kernel, we must restore the old. They are not separate processes as can be seen when you cannot uniquely identify their name through process information as it all is just part of the system process. Ssdthook implements a driver level hook in ssdt table of windows system. Mar 19, 2014 well do that by writing a kernel driver, which well load into the kernel at which point the driverentry routine will be called. Execute this command to display the first 18a hexadecimal pointers in the ssdt.

I found that zwopenkey and zwcreatkey should be hooked and permission of them changes to read only. Display and delete system driver service informations. Sandboxie driver hooks in kernel to protect resources from sandboxed processes it hooks kernel objects of type type, ssdt, shadow ssdt. We chose to use an ssdt hook over a filter driver, msr hook, or dbi tool for a number of reasons.

The ssdt holds pointers to kernel functions, and in this case we are looking for nt. What functions in kernel mode, in my driver, do i have too hook, ssdt hooking, in order to prevent these processes from injecting dlls. Similarly there is keservicedescriptortableshadow variable which has two ssdt arrays. Is it possible to share imagemagick files with others over a network drive ex z. I need to hook ssdt for protection of some keys value of registry, but i cant find any useful tutorial or simple source code for this stuff i found that zwopenkey and zwcreatkey should be hooked and permission of them changes to read only. Code injection and api hooking techniques securityxploded blog. There are actually two ssdt s, a regular ssdt and a shadow ssdt. Drivers are mapped into the memory as named sections and are. Jun 28, 2014 duke of cambridge plays mental health jenga with deeney, mctominay, akinfenwa, townsend and smith duration. Mar 21, 20 page 1 of 9 help me to remove all ssdt,kernel hooks, hidden registry keys,rootkits and so on posted in virus, trojan, spyware, and malware removal help. To hook a routine in idt, we need to following the steps below.

Rootkit ssdt hooking ntquerysysteminformation yudha. What services to outsource, critical security concerns for the financial cybersecurity budgeting and spending trends 2020. Ntterminateprocess hookthis hook will protect any process named calc. If weve already loaded the hookssdt driver into the kernel, the zwquerysysteminformation is already hooked at the time of running gmer. First, each processor has its own idt, which is an issue on multiprocessor machines. Mar 20, 2014 this is the main ssdt and it stores function pointers to kernel routines present in ntoskrnl. Hang zwterminateprocess in the x64 driver without ssdt. Two points are important to note when dealing with the idt. If so, i can even go back and using the syscall find out what function was supposed to be there.

The 1 st ssdt array is a copy of the previous array whereas the other one stores function pointer to kernel routines present in win32k. The real problem here, is loading the kernel driver on x64, as i expect this project to be noncommercial, it is not likely that the driver nor the application will have a digital certificate. Therefore it is safe to say there is sometime until you can find a trick to bypass patchguard to load a rogue driver. Mar 05, 2017 its a weird hook, it goes out 150 yards and than. Source code kernel driver bypass mpgh multiplayer game. How does kernel detective check if api functions are hooked. A filter driver tends to obtain the results from calling a system call as opposed to the exact system calls called. If only the first ssdt is hooked, you could check the values with those in the shadow ssdt. How to code and load an unsigned kernel driver windows 7810 duration. Feb 19, 2012 this hook will get called before the kernel function in the ssdt. I did a simple ssdt hooks detector that iterates through all entries and checks if any address is outside the kernel module. May 29, 2017 anyway to answer your question, you dont want to be using ssdt hooking really anymore and you cannot hook win32 api functions from kernel mode they only exist from usermode, you have to hook ntapi equivalents which reside in kernel mode e.

If a kernelmode driver will crash, the entire operating system crashes. There are actually two ssdts, a regular ssdt and a shadow ssdt. Didnt go further there, but supposedly this is to control that the functions pointed to are actually within the kernel s own implementation and not any 3rdparty driver. Ive to upgrade my program to using in 64bit version of windows now. Investigating memory analysis tools ssdt hooking via. I suppose that at this point i could also try to undo the hook, but i havent tried yet. Ntdeletevaluekey hook this hook will protect any values named abcdef from being deleted.

Contribute to yawenokssdt hook development by creating an account on github. This method of hooking is pretty unsafe, when working in the kernel. How to prevent dll injection by using ssdt hooking. Hook detector detect and restore ssdt,shadow ssdt,sysenter and int2e hooks. Ntloaddriver hookthis hook will display the driver name in the debuggerdebugview. In the windows x64 kernel, simply overwriting a pointer of a system function is not possible anymore. To detect such a hook, we need to load a driver that will scan the ssdt and compare each pointer to the address range of ntoskrnl module.

Help me to remove all ssdt,kernel hooks, hidden registry keys. Yes, as i have understood the 64bit ssdt implementation uses offsets instead of absolute addresses. In this article well present how we can hook the system service dispatch. Sep 24, 20 for every kernel function in ntdll, there is an equivalent pointer within the ssdt, therefore we can hook any function at will just by replacing the pointer. The implementation of altering ssdt to hook these functions and to manipulate the.

And unfortunately in the 64bit windows we cant use ssdt hook because patch guard kpp,notice that i dont want to bypassing pg in this case and ive to use only kernel mode hooking. Thus it is prevented that our archiving software cannot be closedor only if certain conditions are given. Kernel ring0 ssdt unhook driver this is the full code of unhooker project, the driver and the loader. This program will install the driver to the system, and then load it. Note starting with windows vista, do not implement filter hook or firewall hook drivers. Imagemagick works fine on my own machine as i used its binary. How does kernel detective check if api functions are. Aug 31, 20 hide process by hook v2 kernel mode duration. Keservicedescriptortable is exported by kernel, we can get its address. Drivers utilize the system process which generally has the process id of 0x04.

I am looking for some examples of ssdt registry hooking. We are also able to hook all kernel mode calls to functions starting with zw using this method, however, we cannot hook kernel mode calls to functions starting with nt. Is there any other way to do so besides ssdt hooking. Help me to remove all ssdt,kernel hooks, hidden registry. You can check if any entries in the ssdt point to addresses outside the kernel win32k. In the past, rootkits would hook the ssdt and replace the pointer to kernel functions so that when system services were called, a function inside of their rootkit would be executed instead. Writing drivers to perform kernellevel ssdt hooking. Detect and restore fsd and keyboard disptach hooks.

Challenges in kernelmode memory scanning october 2, 2009 rachit mathur research scientist. Investigating memory analysis tools ssdt hooking via pointer. Jun 28, 2014 to detect such a hook, we need to load a driver that will scan the ssdt and compare each pointer to the address range of ntoskrnl module. Ssdt system service descriptor table gdt global descriptor table idt interrupt descriptor table nevertheless, directly hooking the ssdt should be still possible, especially with x86 architectures. If one is outside this range, its probably hooked by some module. Trusting kernel drivers is really important especially when they install hooks because they can do anything with your system they like. All you need to do is, determine the pointer to the system function, which will be hooked either in the kiservicetable or w32pservicetable,o and overwrite the corresponding function pointer with a pointer to your hooking function e. You can check if any entries in the ssdt point to addresses outside the kernelwin32k.

How to get every detail about ssdt, gdt, idt in a blink of. Idt system calls are used to traverse the barrier that exists between user space and kernel space, for this task the idt is used, the idt is the table that implements the interrupt vector table, in turn used to dispatch. This is the method chosen in this paper to monitor api calls at a kernel level. I am a new developer in kernel programming and driver concept. Oct 27, 2014 lets now move to the analysis of the hooking at kernel space, in particular we will deal with. Tutorial writing drivers to perform kernellevel ssdt hooking. Jun 24, 20 my first ssdt hook driver posted in source codes. This would suggest that every kernel service routine has its own service number stored in 4 bytes after the first byte of its opcodes once we have the correct service number for the api we want to hook, we can replace it in the descriptor table disabling write protection with the cr0 cpu register, setting the new routine address and then restoring cr0 protection. If you want to use the code, you are recommand to import in vs20. Changing ssdt values is called hooking and is commonly used by antivirus. Mar 21, 2014 writing windows kernel mode driver updated 2019 outsourcing cybersecurity. The system service descriptor table ssdt is a data structure containing pointers to kernel routines. Windows kernel also uses patchguard to protect its kernel from such changes but its just security over obscurity because kernel drivers run in a privilege same as kernel and there are tons of article about how to bypass patchguard and there is nothing like this. How to get every detail about ssdt, gdt, idt in a blink.