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Vault7: CIA Hacking Tools Revealed

Navigation: » Directory » Embedded Development Branch (EDB) » EDB Home » Projects » DerStarke

Creating new Unlock files future firmwares

  1. Grab trunk of darkmatter and navigate to in/unlock dir
  2. Use SFIT to extract the PchSpiRuntime file (this file locks FVH through the PCH)
    • Use the following command to parse the new firmware to find out which file is the PchSpiRuntime
      • python3 -m sfit <firmware file>
    • Locate the PchSpiRuntime file (GUID: c194c6ea-b68c-4981-b64b-9bd271474b20
      • New MacBooks now have the lock in a file with GUID: 77693c87-a21a-441f-9cc6-054982cddbb7
    • Extract the depex and efi files with the following command:
      • python3 -m sfit <firmware file> <depex file id from prev listing> <output filename>
      • python3 -m sfit <firmware file> <PE32 file id from prev listing> <output filename>
    • Copy the depex and efi files to in/unlock/extracted
  3. Use Ghidra to find where to subvert flash locking code
    • Find the FlashLockingCode function
      • Use previous version of an RE'd firmware for guidance
      • The function should have the following flow (or similar)
        1. Get the EfiHobList (guid: 7739f24c-93d7-11d4-9a3a-0090273fc14d)
        2. Iterate through to find the value of BootMode
        3. If BootMode == 0x12 or BootMode == 0x20 keep the flash unlocked... else lock the flash
    • Patch the FlashLocking Code in order to always keep the flash unlocked
      • General idea is that there is usually a local variable that is also being check (default name of cVar1 by Ghidra)
      • If the variable == 0, the code will flow in the same direction of not locking the flash
      • The variable is initialized to 0, and only assigned a value in one spot.
      • Find that MOV statement, and NOP the 2-3 bytes of that instruction (NOP is 0x90)
      • Make modicications in a hex editor, and reload into Ghirda to make sure it has the desired disassembly and flow
        • I have had zero luck making the changes inside Ghidra and using the export wizard
      • Save the file in in/unlock
  4. Generate Dxe File from Efi using create_unlock.py
    1. Open create_unlock.py inside the in/
    2. Find the definition of PchSpiRuntimeFiles structure (~line number22)
    3. Add a new entry for the new PchSpiRuntime file
      • Elements are [filename of patched file done in step 3, extracted depex from step 2, output dxe with standard compression, output dxe with lama compression]
    4. Run the python file and you should have both a standard and lama compressed Unlock file
  5. Integrate new file into DarkMatter source
    • For Makefile
      1. Add all files to scripts/dxe_to_h.py
    • For Loader.c
      1. Add #include for both .h files (std and lzma)
      2. Add new enum type MacModelNames
      3. Add new ImplantStruct PatchedFiles (make sure they align, ie, MacModelNames MBP_61 is the 0th element of PatchFiles)
      4. Add if case inside function PatchFirmware()

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