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But we have a few newcomers like Dexcalibur, House, Quark and MobSF. How useful are they? Let's see how well they perform over a few malicious samples of 2020/2021.
In this presentation, I explain how to use/customize those tools for malware analysis. I highlight what they are good for, and their limitations.
- Dexcalibur and House are similar: they help researchers write Frida hooks. We can unpack Android/Alien in a few clicks with them! Or reveal obfuscated strings. Or bypass with anti-debug features of Android/Ghimob.
- Currently, it is however difficult to hook functions inside a dynamically loaded DEX. This is an issue for packed samples, for which the malicious payload is precisely in that DEX.
- House helps you monitor HTTP requests the sample does. But, honestly, Wireshark does as well. The only addition with House is that we can decrypt posted data (example with Android/EventBot).
- Quark and MobSF are useful to get an overview of samples. We customize Quark to detect socket creation of Android/Sandr, and use MobSF to detect where the malware sends SMS messages.
Disclaimer: I am not the author of those tools, but I have used them frequently (reported bugs, etc.). So, this presentation provides an un-biased (but perhaps incomplete) feedback from an anti-virus analyst's perspective.
Got a question about this presentation? To get in touch with the speaker, contact Axelle by email on [email protected].
Axelle is Principle Security Researcher at Fortinet. She focuses on Android malware and IoT malware. She is also the lead organizer of Ph0wn CTF, a CTF dedicated to smart devices. In a prior life - before she joined Fortinet - Axelle used to implement cryptographic algorithms and protocols.