theXappy
thexappy.bsky.social
theXappy
@thexappy.bsky.social
Mobile Security Researcher, Packets Inspector, .NET dev
Ever wondered what your modem really says to your SIM card?

I sniffed raw APDU traffic off the SIM pins, decoded the UART based on the ATR, and piped it into Wireshark.

Full guide: how to wire it, decode it, and see the bytes for yourself.
🔎💥📶
github.com/theXappy/tra...
May 3, 2025 at 6:33 AM
Wrote some Cursed C# today.
Made `Console.WriteLine` throw a `System.UnauthorizedAccessException`.
March 8, 2025 at 1:34 PM
TIL: If you "return a struct" from a C/++ function, and it's larger then 8 bytes, it becomes a by-ref argument.

Caller created an empty struct -> Passes pointer to the func, as the last arg -> func populated the pointed struct.

* at least for MSVC for x64
December 5, 2024 at 5:28 PM
That time I wrote a Wireshark dissector for Roccat KoneXTD
Damn I love reversing protocols
github.com/theXappy/Kon...

#reverseengineering #reversing #wireshark
November 22, 2024 at 10:52 AM