zsteg
gef
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zsteg
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Do you think there’s something hidden in this pic?
Yeah, and it's open source.
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Yesterday afternoon a new account shared this image in Alex Bale's fan Discord. Can you help me analyze? I've been trying for a minute.
zsteg didn't find anything. reddit strips any exif. Didn't see any weird strings.
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CTF Writeup: picoCTF 2022 Forensics
I decided to use zsteg instead, with the -a option to try all known methods, and the -v option to run verbosely,
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Awesome CTF : Top Learning Resource Labs
Zsteg - PNG/BMP analysis.
gef
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Beej's Quick Guide to GDB (2009)
There is also GEF, which is widely used by the reverse engineering and CTF community.
https://github.com/hugsy/gef
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How do you use gdb without the tui? Are there advantages? Or just describe your GDB workflow.
If you are on Linux, install GEF and be happy.
- TF2 on Linux is running incredibly poorly, reporting 1200%+ CPU usage. Steam also appears to have some sort of memleak and infinite loop/callback going on leading to absurd CPU usage over time.
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Any good and easy-to-use C debuggers?
If you are in linux, I recomend none of them (haha) because you should get more used to GDB a little bit. You just need to install some good visualizers likes GEF, for example.
- Emulating an emulator inside itself. Meet Blink
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Are there any cpu emulators that could help me learn i386 assembly?
https://github.com/hugsy/gef, https://hugsy.github.io/gef/, https://hugsy.github.io/gef/commands/context/ ("Values in red indicate that this register has had its value changed since the last time execution stopped.")
- What plugins do you recommend for ExploitDev or RE and why?
- Awesome TUI tools
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Fully Dockerized Linux kernel debugging environment
The attached debugger is not just raw GDB but is using https://hugsy.github.io/gef/ to make debugging less of a pain. It's still not perfect but helps plenty already.
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Debugging with GDB
I still struggle with GDB but my excuse is that I seldom use it.
When I was studying reverse engineering though, I came across a really cool kit (which I've yet to find an alternative for lldb, which would be nice given: rust)
I'd recommend checking it out, if for no other reason than it makes a lot of things really obvious (like watching what value lives in which register).
https://github.com/hugsy/gef
LLDB's closest alternative to this is called Venom, but it's not the same at all. https://github.com/ovh/venom
What are some alternatives?
UglifyJS2 - JavaScript parser / mangler / compressor / beautifier toolkit
pwndbg - Exploit Development and Reverse Engineering with GDB Made Easy
hashcat - World's fastest and most advanced password recovery utility
peda - PEDA - Python Exploit Development Assistance for GDB
CyberChef - The Cyber Swiss Army Knife - a web app for encryption, encoding, compression and data analysis
gdb-dashboard - Modular visual interface for GDB in Python
apk2gold - CLI tool for decompiling Android apps to Java. It does resources! It does Java! Its real easy!
lldb-mi - LLDB's machine interface driver
pwntools - CTF framework and exploit development library
radare2 - UNIX-like reverse engineering framework and command-line toolset [Moved to: https://github.com/radareorg/radare2]
masscan - TCP port scanner, spews SYN packets asynchronously, scanning entire Internet in under 5 minutes.
edb-debugger - edb is a cross-platform AArch32/x86/x86-64 debugger.