rbasefind
A brute-force base address scanner based on @mncoppola's basefind.py & @rsaxvc's basefind.cpp implemented in rust.
Features
Scans a flat, 32-bit binary file and attempts to calculate the base address of the image. Looks for ASCII English strings then finds the greatest intersection of all 32-bit words interpreted as pointers and the offsets of the strings.
This works rather well on some ARM (non-thumb) binaries. It's a very simple heuristic that attempts to use as little information about the file as possible from the target binary. As such, it isn't going to work miracles.
Help
Scan a flat 32-bit binary and attempt to brute-force the base address via string/pointer comparison. Based on the
excellent basefind.py by mncoppola.
USAGE:
rbasefind [FLAGS] [OPTIONS] <INPUT>
FLAGS:
-b, --bigendian Interpret as big-endian (default is little)
-h, --help Prints help information
-p, --progress Show progress
-V, --version Prints version information
OPTIONS:
-n, --maxmatches <LEN> Maximum matches to display (default is 10)
-m, --minstrlen <LEN> Minimum string search length (default is 10)
-o, --offset <LEN> Scan every N (power of 2) addresses. (default is 0x1000)
-t, --threads <NUM_THREADS> # of threads to spawn. (default is # of cpu cores)
ARGS:
<INPUT> The input binary to scan
Example
time ./rbasefind fw.bin
Located 2355 strings
Located 372822 pointers
Scanning with 8 threads...
0x00002000: 2195
0x00001000: 103
0x00000000: 102
0x00003000: 101
0x00004000: 90
0x45e95000: 74
0x45e93000: 73
0x00006000: 64
0x00005000: 59
0x45ec3000: 58
real 0m40.937s
user 5m20.908s
sys 0m0.035s0x00002000 was the correct base address for this binary.
For large binaries, the default scan may take too long. The search size can be dialed down, at the expense of "accuracy", via specifying a minimum string length. i.e.,
time ./target/release/rbasefind fw_all.bin -m 100
Located 7 strings
Located 372822 pointers
Scanning with 8 threads...
0x00002000: 4
0x2ae7b000: 2
0xffe54000: 1
0xfba46000: 1
0xfb9c3000: 1
0xfb80a000: 1
0xfafe6000: 1
0xfafe0000: 1
0xfae3b000: 1
0xfae13000: 1
real 0m0.149s
user 0m0.751s
sys 0m0.012s
TODO
- Some form of auto mode. Detect endianness based on highest intersection. Auto decrease offset in window around highest match.