Questions tagged [hex]

Format in which is visualized the memory content or the variables while memory inspection. Hexadecimal (or 'hex') represents integers in base 16 (with digits taken within `0`-`9` and `a`-`f`).

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Reverse engineering chinese headunit eeprom

I've got a cheap chinese headunit in my car which i love, but i can't stand the boot logo. Main Components: AllWinner F1C200s processor EN25Q64-104HIP eeprom I bought a programmer and dumped the ...
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1answer
84 views

Checksum in CANbus Message

I'm trying to work out the calculation method for a checksum in a CAN message but I'm having some difficulties. I am unsure if there are actually 4 separate checksums, or one big one at the end of ...
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37 views

Editing assembly language to bypass the condition

I want to edit the compiled DLL code to bypass the variable checking condition. I tried to change the value in the condition but it causes an application crash. How can I "remove" this ...
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24 views

How to select/copy only text characters from HXD?

Suppose you want only the text characters from a file with a bunch of other stuff in there too. Is there anyway to select only the ASCII characters? The text view in HXD shows everything else too.
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170 views

CyberChef Challenge #21

The challenge data/input is: ...
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2answers
111 views

IDA hex != String

, Hello. to learn reverse engineering, I would like to simply change a string via IDA. I select my string, get the adress, and select Change Bytes to get the Hex value : After That, I try to convert ...
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1answer
50 views

how to calculate a byte value

We are reversing the method of creating a byte array packet. These values are obtained by serialport monitor from mediatek metamode usb port.The values of both packets are changed by changing the imei....
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1k views

what is best forum to ask about hex reversing? [closed]

i want to create c script extract encrypt package. just can open it in hex editor to view and need knowledge and technique for write script for extract it. Script will work in command-line ( window 10 ...
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2answers
80 views

Convert series of hex digits represented as ASCII-characters stored in a .txt file to raw bytes

I recently extracted a bunch of raw bytes (from wireshark) into a regular .txt file. Because these raw bytes are stored in a text file, all those hex-digits are actually written as ASCII characters ...
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1answer
76 views

Decoding Hex Data

I'm trying to decode .PLW data acquired by a temperature logger (PicoLog PT-104). If you convert the .PLW file to a .txt file through the official software you get something like this: where each row ...
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1answer
509 views

Unpack .apk file from a PC game (NOT Android related)

I have an old PC game called Air Strike 3D II. I wanted to extract music files but I couldn't figure out how to unpack the .apk file (NOT Android package). 7-zip can't open it. When I open the .apk ...
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1answer
20k views

Approach to extract useful information from binary file

The purpose of this question is to gain an understanding of the concepts behind reverse engineering and to understand what approaches may be taken to extract useful information from a binary file. I'...
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1answer
240 views

Decipher variable length serial protocol

I have an ebike consisting of a controller which regulates power to the motor and a smart LCD which can adjust max speed, power output, pedal assist sensitivity etc as well as displaying the current ...
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36 views

N64 ROM file index hacking issue

Alright, I downloaded the N64 SDK and compiled one of the samples provided by the SDK and dissembled the ROM with IDA and found the asset data is stored some way using index's so my question is. What ...
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1answer
533 views

Issues with reversing LZSS compression algorithm

I am trying to reverse engineer my HP printer's firmware, so I dumped the SPI chip from the board, and there are a lot of strings, but almost always look something like this: I noticed a pattern that ...
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11 views

Tool for navigating native assembler code and memory hex for interpreted languages like VBA

Complete newbie to this area and I have limited experience writing code in low level languages so I'm not familiar with the debugging techniques, but bear with me:). I'm trying to understand the ...
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1answer
57 views

I want to modify the data [closed]

I am so newbie about this matter. I have a file XXXX.record file that contains a data. When I open the file How can I read this data and modify the values? thanks.
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1answer
3k views

Finding, hex-editing date timestamp to correct it

Trying hex-editing to fix the date-time data in file which was generated while the computer system clock was wrong. Some tutorial will be helpful appreciated after my attempts so far. [screen shot ...
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1answer
8k views

Making changes in ELF file after dissassembly [duplicate]

I am new to reverse engineering and after some research, I haven't found a clear way to do what I want to do. I have an ELF file, but not the original source code that generated it. It is really ...
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1answer
102 views

Hex editing a program to change variable types

For starters guys please don't get mad at me because I really googled this question for a while and couldn't find a satisfying answer. Also if I'm asking an idiotic question, I apologize beforehand. ...
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1answer
194 views

Passing hex strings to Radare2

I can quickly test hex string arguments in gdb like this: r $'\x61\x61\x61\x61' I'd like to do something similar in radare2 but all I can figure out is regular strings: doo aaaa I tried this but ...
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1answer
2k views

Reverse engineering Earthsiege 2 3D model format

As a personal project I've been trying to reverse engineer the art assets for the old Dynamix game Earthsiege 2 (this game has long been abandonware and was recently released for free by Hi-Rez, the ...
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0answers
71 views

Any way to edit an ELF binary without hex? [duplicate]

So, this is a noob question, I am a complete beginner in this field, so sorry if I'm wasting your time in any way. I wanted to know, if there is a way to edit an ELF binary without using a hex editor....
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326 views

How can I see specific memory value by using Hex view in IDA?

I'm about to use IDA pro. I have to access to 0018F42C(EAX) by using Hex view in IDA. Maybe I guess there is EAX value.(String is "happyy", standard input) but Hex view shows me 0018F410 as in screen1....
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2answers
768 views

RSA Decryption? [closed]

I am playing a game in my university where you have different puzzles based on cryptography and now in a puzzle named 'rsa', we have 2 files: 'key', 'secret'. The task for this is to decrypt the ...
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1answer
113 views

Help with a pointer

Sorry for this stupid question. It's late here and I've been kinda stuck for a while over this so I hope someone here can answer this easily. In CheatEngine, 028FA190+374 is pointing to 028F1788. ...
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1answer
613 views

Checksum error when flashing modded firmware on embedded device

I'm trying to patch strings in my firmware with a hex editor but I keep getting a checksum error when I go to re-flash the modded firmware onto my device. The device is a Roland gr-55 guitar ...
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1answer
291 views

How to calculate the checksum algorithm with data captures

I have an obsolete control system that I am trying to write an interface into our new control system. I have spent weeks capturing data and figuring out the addressing, polling commands, point ...
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1answer
7k views

Basic question: how to input non-printable hex values in GDB / NC? [duplicate]

I'm working on a CTF challenge that is an introduction to smashing the stack. I have the binary working in GDB, and can overwrite the correct part of the stack with printable characters. The ...
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1answer
287 views

Decoding serial data package

I have an assignment at work, to get information from Jenbacher generator and show values in new SCADA system. It has a B&R CP260 PLC with RS232 port and RS232 to RS485 converter. Currently it’s ...
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1answer
122 views

Understanding what is represented by function pointers to a block of hex

I'm working on a disassembly project for my class where I'm trying to bypass a license check, but when I throw the executable into Binary Ninja this is what I see: And when I look at those pointers, ...
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2answers
581 views

Disassembling Hex to assembly, then what?

I am working on a HEX string, which I figured out is a binary. I would like some pointers on what to do next after I have disassembled from hex to assembly. I'm just assuming that the architecture is ...
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1answer
191 views

Hex timestamp decode

I am trying to decode this hex timestamp: 5A24 B103 73AE --> 02/26/2018 15:45:44 5A24 FC03 83BC --> 02/26/2018 17:00:48 5A24 FE03 93E3 --> 02/26/2018 17:02:58 Data is coming from an old ...
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1answer
126 views

Identifying Checksum?

I bring you either a hard challenge or the easiest challenge you've ever had. I have a save file for this game The first bytes are: F9 29 CE 54 02 4D 71 04 4D 71 00 00 this is the same throughout ...
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1answer
807 views

File analysis with hexdump - unknown container

I have a backup file, generated by an android phone. However, I don't know the file type or how to extract the contents without the original software. I've tried to search for common file headers ...
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0answers
1k views

Reverse Intel hex to programming code

I have a file in the Intel hex format, which was taken of from a pic16F1705 chip. I need to find a way to disassemble it into some form of human friendly programming language in order to make some ...
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1answer
2k views

Bypassing av signature with Hex editing

I recently started studying on bypassing AV by finding an AV signature on nc.exe (NetCat) and changing it to see how it works. I have already found the place of signature with splitting method. Then, ...
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1answer
601 views

How can I create an appropriate Japanese .tbl file for Hex Editing?

I'm trying to edit a Japanese Configuration executable using Resource Hacker and I just want to translate the UI stuff to English. There are also a few English text that I was able to find and ...
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2answers
173 views

Do .NET functions have function prologs?

If I'm looking at a binary compiled with VC++ in a hex editor and I want to identify the start of functions - I can look for the hex "55 8B" - which is a common function prolog. Is there something ...
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1answer
299 views

Invalid INDX entries for $I30 on NTFS harddisk

While parsing my NTFS formatted hard disk, I found some invalid entries of INDX while Windows is still able to list all the root directory contents! The structure of the Index Record in NTFS 3.1 is ...
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1answer
151 views

What does this sequence of numbers mean?

so i'm reversing a file format of game. As far as i can understand the file i'm trying to reverse contains compressed textures. I'm already able to locate the textures and decompress them, but i'm not ...
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0answers
193 views

What does the “Offset to the filename” stands for in an Index Record in NTFS

The structure of the Index Record in NTFS 3.1 is clear: Offset Description ------------------------------------- 0x00 MFT Reference of the file 0x08 Size of the index entry 0x0A ...
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3answers
6k views

Parsing/Rescuing corrupted IDA database

I'm reversing an application with IDA. My VM crashed and left the IDA database in a corrupted unpacked state. The next time I tried to load it back, IDA gave me the following error message: The ...
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1answer
664 views

Router flash dump unknown filesystem

I'm trying to reverse engineering my router firmware after reading an interesting article about an hidden backdoor inside router firmwares from a popular company. Data has been extracted (using ...
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1answer
679 views

How to extract an unknown archive file? Currently Im trying to open *.pak (P5CK)

I have a console game called Timesplitters Future Perfect(iso file). I were able to extract and got bunch of files. *.pak being one type I would like to open and see. I opened up a hex editor and saw ...
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1answer
6k views

Adding a new PE section for a code cave

I am trying to add a 1000 byte code cave using LordPE to a standalone exe. From what I understand I have to edit the PE header with a new section of 1000 bytes then open the exe in a hex editor and ...
3
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2answers
287 views

Problem with converting hex values to decimal

I'm reverse-engineering custom binary file format. I'm using 010 Editor to check this file. I found data structure to represent UTF-8 strings, which has header section of one or two bytes in length ...
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1answer
1k views

Basic clarifications about .hex and .bin file

I am newcomer to this field. I would like to understand how these things work and what these file contain (and if I'm on the right path). To explain my doubts, I will use the .hex file posted in a ...
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1answer
599 views

how to translate HEX values into X Y Z

I am trying to understand how an application I have been using is setting its data in XYZ coordinates which I wish to convert to HEX value. The application essentially shows me the XYZ in one format (...
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1answer
1k views

How to reverse engineer hex data on EEprom? [closed]

I am learning how to reverse engineer the EEprom data in Automotive ECUs. For such purposes as to disable the immobilisers, find millage data and workout encoded VIN numbers among other things. I ...