https://github.com/shindakun/bytepatcher
For when you need to patch a binary file.
https://github.com/shindakun/bytepatcher
go golang patcher
Last synced: 17 days ago
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For when you need to patch a binary file.
- Host: GitHub
- URL: https://github.com/shindakun/bytepatcher
- Owner: shindakun
- Created: 2018-01-18T00:05:11.000Z (over 7 years ago)
- Default Branch: master
- Last Pushed: 2021-04-18T19:06:06.000Z (about 4 years ago)
- Last Synced: 2025-03-21T18:09:11.841Z (about 1 month ago)
- Topics: go, golang, patcher
- Language: Go
- Homepage:
- Size: 48.8 KB
- Stars: 10
- Watchers: 1
- Forks: 5
- Open Issues: 1
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Metadata Files:
- Readme: README.md
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README
# bytepatcher
Sometimes you'll run into a situation where you need to patch a binary file. bytepatcher is a small utility writen in Go which can be used when you know the signature and patch hex.
bytepatcher was created as a learning project.
## Installation
If you are a Go user you can run `go install github.com/shindakun/bytepatcher`. Prebuilt binaries are not currently provided.
## Usage
$ ./bytepatcher
-in string
input filename
-out string
output filename
-patch string
patch hex as string
-sig string
signature as string
## Usage example
For a very basic example, say we need to change a JE (74) to a JMP (EB) in an executable file.
```bash
$ bytepatcher -in file.exe -out patched.exe -sig 83F8057441 -patch 83F805EB41
2018/01/17 13:20:00 Signature: 83f8057441
2018/01/17 13:20:00 Patch: 83f805eb41
2018/01/17 13:20:00 Found signature at 0x5e3!
2018/01/17 13:20:00 Wrote 5 bytes!
2018/01/17 13:20:00 Saved output!
```
You'll note we used a long signature and patch, this is because we wanted to patch one specific location in the file. If we had used a shorter signature we would potentially patch in the wrong spot. Also it is worth noting that currently we're only able to patch a single location. So, even though we're writing 5 bytes we're really only patching 1.