Binwalk Package Description

Binwalk is a tool for searching a given binary image for embedded files and executable code. Specifically, it is designed for identifying files and code embedded inside of firmware images. Binwalk uses the libmagic library, so it is compatible with magic signatures created for the Unix file utility. Binwalk also includes a custom magic signature file which contains improved signatures for files that are commonly found in firmware images such as compressed/archived files, firmware headers, Linux kernels, bootloaders, filesystems, etc.

Source: https://github.com/ReFirmLabs/binwalk
Binwalk Homepage | Kali Binwalk Repo

  • Author: Craig Heffner
  • License: MIT

Tools included in the binwalk package

binwalk – A firmware analysis tool
root@kali:~# binwalk -h

Binwalk v2.1.2
Craig Heffner, ReFirmLabs
https://github.com/ReFirmLabs/binwalk

Usage: binwalk [OPTIONS] [FILE1] [FILE2] [FILE3] ...

Signature Scan Options:
    -B, --signature              Scan target file(s) for common file signatures
    -R, --raw=<str>              Scan target file(s) for the specified sequence of bytes
    -A, --opcodes                Scan target file(s) for common executable opcode signatures
    -m, --magic=<file>           Specify a custom magic file to use
    -b, --dumb                   Disable smart signature keywords
    -I, --invalid                Show results marked as invalid
    -x, --exclude=<str>          Exclude results that match <str>
    -y, --include=<str>          Only show results that match <str>

Extraction Options:
    -e, --extract                Automatically extract known file types
    -D, --dd=<type:ext:cmd>      Extract <type> signatures, give the files an extension of <ext>, and execute <cmd>
    -M, --matryoshka             Recursively scan extracted files
    -d, --depth=<int>            Limit matryoshka recursion depth (default: 8 levels deep)
    -C, --directory=<str>        Extract files/folders to a custom directory (default: current working directory)
    -j, --size=<int>             Limit the size of each extracted file
    -n, --count=<int>            Limit the number of extracted files
    -r, --rm                     Delete carved files after extraction
    -z, --carve                  Carve data from files, but don't execute extraction utilities
    -V, --subdirs                Extract into sub-directories named by the offset

Entropy Options:
    -E, --entropy                Calculate file entropy
    -F, --fast                   Use faster, but less detailed, entropy analysis
    -J, --save                   Save plot as a PNG
    -Q, --nlegend                Omit the legend from the entropy plot graph
    -N, --nplot                  Do not generate an entropy plot graph
    -H, --high=<float>           Set the rising edge entropy trigger threshold (default: 0.95)
    -L, --low=<float>            Set the falling edge entropy trigger threshold (default: 0.85)

Binary Diffing Options:
    -W, --hexdump                Perform a hexdump / diff of a file or files
    -G, --green                  Only show lines containing bytes that are the same among all files
    -i, --red                    Only show lines containing bytes that are different among all files
    -U, --blue                   Only show lines containing bytes that are different among some files
    -w, --terse                  Diff all files, but only display a hex dump of the first file

Raw Compression Options:
    -X, --deflate                Scan for raw deflate compression streams
    -Z, --lzma                   Scan for raw LZMA compression streams
    -P, --partial                Perform a superficial, but faster, scan
    -S, --stop                   Stop after the first result

General Options:
    -l, --length=<int>           Number of bytes to scan
    -o, --offset=<int>           Start scan at this file offset
    -O, --base=<int>             Add a base address to all printed offsets
    -K, --block=<int>            Set file block size
    -g, --swap=<int>             Reverse every n bytes before scanning
    -f, --log=<file>             Log results to file
    -c, --csv                    Log results to file in CSV format
    -t, --term                   Format output to fit the terminal window
    -q, --quiet                  Suppress output to stdout
    -v, --verbose                Enable verbose output
    -h, --help                   Show help output
    -a, --finclude=<str>         Only scan files whose names match this regex
    -p, --fexclude=<str>         Do not scan files whose names match this regex
    -s, --status=<int>           Enable the status server on the specified port

binwalk Usage Example

Run a file signature scan (-B) on the given firmware file (ddwrt-linksys-wrt1200ac-webflash.bin):

root@kali:~# binwalk -B ddwrt-linksys-wrt1200ac-webflash.bin

DECIMAL       HEXADECIMAL     DESCRIPTION
--------------------------------------------------------------------------------
0             0x0             TRX firmware header, little endian, image size: 37883904 bytes, CRC32: 0x95C5DF32, flags: 0x1, version: 1, header size: 28 bytes, loader offset: 0x1C, linux kernel offset: 0x0, rootfs offset: 0x0
28            0x1C            uImage header, header size: 64 bytes, header CRC: 0x780C2742, created: 2018-10-10 02:12:20, image size: 2150281 bytes, Data Address: 0x8000, Entry Point: 0x8000, data CRC: 0xA097CFEA, OS: Linux, CPU: ARM, image type: OS Kernel Image, compression type: none, image name: "DD-WRT"
92            0x5C            Linux kernel ARM boot executable zImage (little-endian)
2460          0x99C           device tree image (dtb)
23432         0x5B88          xz compressed data
23776         0x5CE0          xz compressed data
2117484       0x204F6C        device tree image (dtb)
3145756       0x30001C        UBI erase count header, version: 1, EC: 0x0, VID header offset: 0x800, data offset: 0x1000
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