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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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26 views

Change window name + Friendlyappname

I want to modify the "Adobe Flash Player 31" its a Unicode string to "Testt of the Dem Cas" I tried using HxD and it would not work as anticipated. I do not want to use a 3rd party tool to do it (I ...
2
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1answer
85 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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55 views

Strip digital signature check mechanism from windows

I had hex-edited the Windows kernel binary c:\windows\system32\ntoskrnl.exe to fix some assembly bytes in the way i need it. And i want to boot it. However i encounter 0xc0000428 error, saying Windows ...
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1answer
138 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
33 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, ...
0
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1answer
57 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 ...
1
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1answer
106 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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2answers
182 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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0answers
204 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 ...
0
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0answers
90 views

Decode Filter Coefficients for Audio DSP

I'm trying to create my own bit of code to create filter coefficients for this particular audio dsp system but I can't decipher the filter coefficients. Here's what I have: DSP is floating point ...
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0answers
35 views

Analyzing game terrain texturing

Recently I've been trying to RE a terrain format from a mobile game. While there are other file types associated with a single world chunk, the terrain file itself seem to contain such info as: - ...
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1answer
59 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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0answers
290 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
336 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, ...
2
votes
1answer
269 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 ...
0
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2answers
113 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 ...
2
votes
1answer
158 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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vote
1answer
116 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 ...
2
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0answers
74 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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1answer
261 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
292 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 ...
4
votes
2answers
149 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 ...
2
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1answer
2k 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 ...
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1answer
2k 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
6k 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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0answers
80 views

Identification of an Unknown File System in an ITRON OS

I am attempting to reverse an unknown file system found in an ITRON based operating system (circa 2003), but have not been able to figure this out. Any clues to identifying or reversing this file ...
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1answer
652 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
216 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
335 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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1answer
255 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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0answers
580 views

Finding checksum algorithm

I'm a new forum user. I've a problem with a checksum calculation. I have this sequence of byte transmitted on a Tx-Rx 868 MHz system. I don't know the algorithm that generate the checksum. It's ...
2
votes
1answer
212 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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1answer
595 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 ...
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0answers
170 views

Analyzing Game Map/Terrain Format

I'm trying to understand how this game builds the map and terrain. Specially if it uses a heightmap. So I can write an app that can view the map and move around (camera) freely. First, I'm not ...
2
votes
1answer
1k views

Reversing unknown data in hex string

I have a string from job advert (Ethical hacker). I am not planning to candidate to that position. I just would try to resolve puzzle. Can someone suggest directions to look further? (And not yet post ...
0
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1answer
91 views

Using HEX editor and making 4 chars from 3 chars [closed]

I need to replace a single string in a bin. The actual string has 3 chars and the new one must have 4.If I use a hex editor this will make the exe useless.So is there any way to add bytes there to ...
2
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0answers
91 views

Restore function key

I have a simple function which looks like that: keyAlphabet = [-1, 16, 32, 127, 61, -32, -31, 43, 0, 88, 2, 5, 7, 112, 64, 69, 96] key = ??? # only keyAlphabet values p = 0x1337 for i in key: ...p*=i ...
3
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1answer
750 views

Reversing a 3D file format from 2001

This is a korean MMORPG released back in 2001. The game and the company no longer exists. I've been analyzing the file formats as a personal project for awhile now. I have already decoded the ...
3
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2answers
417 views

Is there a tool to scan for code / functions that can account for different compilers?

I have a library DLL and a program that uses the library (statically; the DLL is separate). My goal is to find a bunch of the functions from the library in the program, but unfortunately, it looks ...
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0answers
108 views

Converting Complex Instructions To Hex, How?

I have seen some instructions inside a ARMv7 Thumb binary which I wanted to modify, but I cannot seem to change the instruction and get the hex of it. vldr s0, =50.0 Is the instruction and I wanted ...
0
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2answers
774 views

Editing a string in a native dll

Can anyone help me edit a string in a native dll? When I try to open the dll in CFF explorer or other similar tools, I can't see the string table, probably because it's hidden somehow. The DLL in ...
5
votes
1answer
1k 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 ...
6
votes
1answer
1k 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 ...
2
votes
1answer
864 views

Calculating check sum of m-bus data frame

I'm trying to calculate the check sum of a m-bus data frame. In page 1 of this PDF I'm able to read that the frame's check sum "is calculated from the arithmetical sum of the data mentioned above, ...
3
votes
1answer
515 views

End of central directory signature not found after extracting an embedded zip file

I'm learning about stenography and found this example. I've followed the instructions but when I write out a new zip file after changing the filename inside the file I get this: unzip nospaces.zip ...
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1answer
354 views

How do I find specific sets of data when Hex Editing? (Important) [closed]

not trying to sound like my question is just more important than others because I'm asking it, purely because the outcome of my work will involve electrical impulses directly into people's faces. I ...
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0answers
46 views

Means of generating file hashes

I'm working with a relatively well secured program. In addition to memory validation checks during run time, the actual file integrity is checked at start. Both checks are synced with the server and I'...
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1answer
150 views

Getting Encryption Method When I Know Encrypted File Name & Original File Name

I'm busy trying to decrypt some game data. All the encrypted filenames are hexadecimal strings with the same length e.g. 1790C6E445C7E38EFCD5B3042F9B4443. I've figured out that a few of the files ...
3
votes
1answer
466 views

Reverse Engineering Firmware

I have a HEX file with a firmware for Attiny45. What I want to do is to extract some kind of formula that is coded inside it. I have done some research (mostly to find out that "it is not possible", ...
5
votes
1answer
523 views

Replacing small length instruction with larger length instruction

Basically I want to replace MOVS R1, #0x0 with MOV.W R1, #0x123, since later instruction requires 4 bytes it is impossible to simply replace in HEX code. I am using IDA Pro for analyzing native ...