Firmware Dumping Update
Swissky
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@ -1,21 +1,21 @@
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# Firmware Dumping
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### Summary
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## Summary
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* Send a new firmware into the microcontroller using serial port
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* Dump firmware using debug port
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* Convert ihex to elf
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* Over-the-air updates
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* Explore firmware
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* Type of firmware
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* Check entropy
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* Unsquashfs
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* Encrypted firmware
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* [Send a new firmware into the microcontroller](#send-a-new-firmware-into-the-microcontroller)
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* [Dump firmware using debug port](#dump-firmware-using-debug-port)
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* [Convert ihex to elf](#convert-ihex-to-elf)
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* [Over-the-air updates](#over-the-air-updates)
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* [Explore firmware](#explore-firmware)
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* [Type of firmware](#type-of-firmware)
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* [Check entropy](#check-entropy)
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* [Unsquashfs](#unsquashfs)
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* [Encrypted firmware](#encrypted-firmware)
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### Send a new firmware into the microcontroller using serial port
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- avrdude
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## Send a new firmware into the microcontroller
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* Using [avrdudes/avrdude](https://github.com/avrdudes/avrdude)
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```powershell
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# send raw data firmware
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$ avrdude -p m328p -c usbasp -P /dev/ttyUSB0 -b 9600 -U flash:w:flash_raw.bin
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@ -26,28 +26,24 @@ $ avrdude -c usbasp -p m328p -F -U flash:r:dump.hex:i
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# default
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$ avrdude -c usbasp -p m328p -C /etc/avrdude.conf -U flash:w:hardcodedPassword.ino.arduino_standard.hex
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```
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- picotool
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```bash
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# extention indicates the type (bin, uf2)
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* Using [raspberrypi/picotool](https://github.com/raspberrypi/picotool)
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```ps1
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# extension indicates the type (bin, uf2)
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picotool load firmware.bin
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```
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### Dump firmware using debug port
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* avrdude
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## Dump firmware using debug port
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* Using [avrdudes/avrdude](https://github.com/avrdudes/avrdude)
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```powershell
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$ avrdude -p m328p -c usbasp -P /dev/ttyUSB0 -b 9600 -U flash:r:flash_raw.bin:r
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$ avrdude -p m328p -c arduino -P /dev/ttyACM0 -b 115200 -U flash:r:flash_raw.bin:r
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$ avrdude -p atmega328p -c arduino -P/dev/ttyACM0 -b 115200 -D -U flash:r:program.bin:r -F -v
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```
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* openocd
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Determine code space in the microcontroller (for example nRF51822 - Micro:bit), save as `dump_img.cfg`:
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* Using [openocd-org/openocd](https://github.com/openocd-org/openocd)
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* Determine code space in the microcontroller (for example nRF51822 - Micro:bit), save as `dump_img.cfg`:
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```powershell
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init
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reset init
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@ -55,19 +51,40 @@ halt
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dump_image image.bin 0x00000000 0x00040000
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exit
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```
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* Dump with openocd
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```powershell
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sudo openocd -f /home/maki/tools/hardware/openocd/tcl/interface/stlink-v2-1.cfg -f /home/maki/tools/hardware/openocd/tcl/target/nrf51.cfg -f dump_fw.cfg
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```
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* Using [raspberrypi/picotool](https://github.com/raspberrypi/picotool)
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* Build PicoTool, you will need the pico-sdk
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```ps1
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# PicoSDK
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git clone https://github.com/raspberrypi/pico-sdk.git
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cd pico-sdk
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git submodule update --init
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- picotool
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# Picotool
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cd ..
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git clone https://github.com/raspberrypi/picotool.git
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cd picotool
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mkdir build
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cd build
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cmake -DPICO_SDK_PATH=../pico-sdk ..
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make
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```
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* Dump the program or the whole flash memory
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```ps1
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sudo ./picotool save -F /tmp/out.bin
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Saving file: [==============================] 100%
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Wrote 73312 bytes to /tmp/out.bin
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```bash
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# extention indicates the type (bin, uf2)
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picotool save firmware.bin
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sudo ./picotool save --all -F /tmp/out2.bin
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Saving file: [==============================] 100%
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Wrote 2097152 bytes to /tmp/out2.bin
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```
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### Convert ihex to elf
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## Convert ihex to elf
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> The Intel HEX is a transitional file format for microcontrollers, (E)PROMs, and other devices. The documentation states that HEXs can be converted to binary files and programmed into a configuration device.
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@ -107,11 +124,13 @@ cat defaultPassword.ino.arduino_standard.hex | tr -d ":" | tr -d "\n" | xxd -r -
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Inspect the assembly with `avr-objdump -m avr -D chest.hex`.\
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Emulate : `qemu-system-avr -S -s -nographic -serial tcp::5678,server=on,wait=off -machine uno -bios chest.bin`
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### Over-the-air updates
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## Over-the-air updates
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TODO
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### Explore firmware
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## Explore firmware
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```powershell
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$ binwalk -Me file.bin
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@ -133,14 +152,16 @@ DECIMAL HEXADECIMAL DESCRIPTION
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3708 0xE7C ARM executable code, 16-bit (Thumb), little endian, at least 522 valid instructions
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```
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### Type of firmware
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## Type of firmware
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* SREC - Motorola S-Record : All S-record file lines start with a capital S.
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* Intel HEX lines all start with a colon.
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* TI-TXT is a Texas Instruments format, usually for the MSP430 series. Memory addresses are prepended with an **@**, and data is represented in hex.
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* Raw NAND dumps
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### Check entropy
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## Check entropy
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High entropy = probably encrypted (or compressed). Low entropy = probably not
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@ -148,13 +169,15 @@ High entropy = probably encrypted (or compressed). Low entropy = probably not
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$ binwalk -E fw
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```
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### Unsquashfs
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## Unsquashfs
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```powershell
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sudo unsquashfs -f -d /media/seagate /tmp/file.squashfs
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```
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### Encrypted firmware
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## Encrypted firmware
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