Questions tagged [file-format]

File format refers to the way information and data is encoded and stored in a computer file.

53 questions with no upvoted or accepted answers
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Audio file compression identification

I've been working on reversing file formats from the game of star wars episode 1: the phantom menace. I have managed to extract the audio files from the .lab file in which they were contained. I ...
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1answer
163 views

Reverse engineer compressed iOS app file

I want to find out the compression method used by an iOS app used for music notation to store its files. The files of its OSX counterpart are zipped files. You cannot create files in the iOS app, but ...
4
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1answer
201 views

Are there existing automated approaches to reverse engineering the data types in a binary data stream?

Consider a stream of data packets of a known and consistent size, i.e., N bytes per packet. Are there existing tools that automatically detect (or estimate) the various data types present and their ...
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590 views

Finding decompress algorithm for unknown compression

I have a raw data of what seems to be a compressed PNG file and I need to find the decompress algorithm for unknown compression. You can see the file here. I think they are using some kind of LZRW 1 ...
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2k views

What is a TROC Filesystem, and how do I mount it?

I decompiled a piece of firmware using binwalk and found an entry for a TROC Filesystem: DECIMAL HEXADECIMAL DESCRIPTION --------------------------------------------------------------------...
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719 views

Need help figuring out compression used on a PKDPX file from a Nintendo DS game

So, I've been working on reversing several file formats from the Nintendo DS game Pokemon Mystery Dungeon: Explorers of Sky. So far most formats were pretty easy to reverse, until I stumbled on a ...
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107 views

Uniden FW Hacking

I recently purchased a Uniden Radio Scanner (BCD325P2). I looked at the Windows FW Update App in dnSpy, then pulled the FW bin directly. FCC Parts List gets me R5F5631BCDFP#V0, which appears to be a ...
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83 views

Extracting Archive-Like file format analysis that does not seem to match known formats

Good afternoon, I am looking to try me skills at extracting some data from a proprietary format. I have made some progress but I wanted to contact the experts to see if I could gain some insights. ...
3
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95 views

Interpreting clipboard data from HMI software

I'm attempting to automate tedious processes when using the EasyBuilder Pro software by Weintek, which is programming software for industrial HMIs. Long story short, I need the ability to fill the ...
3
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98 views

methods for identifying deliberately unmagiked filesystem

I am trying to restore a system from backups around some obnoxious copy protection. It is a Linux system from an vendor that does not appear to comply with the GPL and has overwritten the header of ...
3
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2k views

Reverse engineering ps2 game texture file format - got most of it but a few issues

I've spent a lot of time on this and I have made a lot of progress, but there is several problems to solve still. I have this old PS2 game and, as any curious person would, I put the disc in my ...
3
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991 views

Reverse-engineering DOS game's data files

I would like to figure out the data format used by an old DOS game I used to play when I was a kid. That link includes a full download for all the files and it runs fine in DOSBox if you want to try ...
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590 views

Reverse Engineering SCE .pkg Files

To elaborate, I need help decompressing SCE (Sony Computer Entertainment) .pkg files. I've found several common patterns between multiple versions of the same file (released over the span of two years ...
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129 views

Writing a Ghidra FileSystem Module for 8-bit era disk images in which files have no header, format, or magic bytes

I've given myself a project of writing Ghidra Loaders and FileSystems for an 8-bit retrocomputing platform, namely the Sinclair ZX Spectrum. But I'm new to Ghidra, Java, and Eclipse. When developing ...
2
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1answer
289 views

How to make IDA processor for file format with tree structure

Most of file formats IDA handles are structured in a linear way, for example EXE or ELF or Java's Class file and so on. However when it comes to tree-structured file format, I can't come up with a ...
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249 views

How should I got about working out the format for this psp game?

I have been attempting to reverse engineer a format for a visual novel psp game ('Mirai Nikki RE: WRITE - 13 Ninme No Nikki Shoyuusha') and I have come to the understanding that the format works as a ...
2
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344 views

Struggling with an archive file format using "encryption"

I am currently working on a file format used to pack (storage only, no compression) different file types together for transport. There is some sort of very simple "encryption" used and so far I have ...
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402 views

Finding the h.264 stream in a bytestream

I have a bytestream that contains h.264 bytestream packets in it. How can I find it? Output from stream: https://mega.co.nz/#!3llAnLaQ!pc1JPDpDOP6948F2x44LqeYm-p5CDnb91Da334rt4fY The first 13 bytes ...
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1k views

Unknown game data compression method (Gamecube)

I got some game compression data which I couldn't find any clue. All compressed file signature start with: [SK_ASC] and unknown compression method. I got some information from RAM/Executive file but ...
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94 views

What type of file has the file signature 'BOOT'?

I have a .bin file which I am trying to disassemble into something that I can edit. Given that binary files can contain just about any binary data, I found it difficult to assess what file data is ...
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125 views

Decode bitmaps from Director .dxr files

I'm trying to extract bitmaps from an old Macromedia Director protected .dxr file. I was able to find some information about the file structure from here (it turns out to be a XFIR container, the ...
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228 views

How are strokes stored in the Goodnotes file format?

I have been trying to reverse engineer the .goodnotes file format (a note taking app for iOS devices) and so far have discovered this: A .goodnotes file is simply a zip archive, an example file ...
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32 views

Format of Alcatel_Lucent I-240W-A backup file

I am trying to modify the backup file of this router in order to change some configurations. Here is the structure I have until now: 16 bytes of the header, zlib compressed xml with the ...
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563 views

Analyzing firmware image (eCos with YAFFS)

I'm trying to apply some of the practices I learn in class and online and reverse engineer the firmware of a Chinese dash camera. I've downloaded the firmware from their website (Smart dash camera: ...
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119 views

Reproducing video format

I received a promotional video screen with a USB interface. It comes with a couple example videos, one of which is here: https://drive.google.com/file/d/1B-wSURAgK-ePrfpKFM5nYbNhQ5mD-Ii2/view?usp=...
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54 views

Need help reversing .m4t TTML subtitles format

I am currently trying to create subtitles for some proprietary Sony software. Unfortunatly, it only recognizes Sony's own .m4t subtitles format. After some research I found that this subtitles is also ...
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250 views

Mimicking a file format that is actually a zip

Backstory: I have been trying to find a way to automatically turn batches of photos into WhatsApp stickers. I was able to do that, but now I am trying to figure out a way to actually import them into ...
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157 views

Can't install sasquatch tool

Ubuntu 16.04 LTS. I'm trying to install sasquatch tool (which should apply patches to the standard unsquashfs utility), but got the issue, every time build process show error in one place: ./build.sh:...
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96 views

File Decryption Problems

over the past year, I provided an English patch to a community of thousands of players of a game I love and which is not available in English (just Chinese and Korean). Sadly, besides me, other ...
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252 views

Compression algorithm working with bitstream

I'm trying to reverse decompression algorithm for one of old games. After some reversing I found that it reads bit stream, not byte by byte. It looks like this: std::vector<uint32_t> TABLE_1 = {...
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217 views

Unsquashfs fails partways with gzip error code -5

I have been trying to unsquash a system.sfs file in order to modify the directories. however, unsquashfs system.sfs returns the following output: Parallel unsquashfs: Using 8 processors 1 inodes (...
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492 views

Custom image format decoding

TL;DR: is there any chance of decoding custom picture format in case I have sufficient amount of data? Please see examples at end. I have binary files of an old DOS diskmag (late 90's). After couple ...
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1k views

How to decompress a custom game data file?

So here's the rundown: The files in themselves are .spc. Normally, you'd think this is a spectrum file, but it's a custom file made by the developer themselves. It contains an image that is used/will ...
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86 views

Do any of these details contradict the idea that theory that this file is encrypted with Blowfish?

I have a file which has been encrypted with some unknown algorithm. Doing research on the file format, I stumbled across a website that claimed (without explaining why) that these files were encrypted ...
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260 views

Reading stp (Designaknit Stitch Pattern)-Files

I want to write a small knitting program for my wife. In it, I will also read * .stp files (Stitch pattern). These are small files containing a graphic created by the program DesignaKnit and many of ...
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1k views

Converting Duden dictionaries for Stardict/Goldendict

I’ve a bunch of first-class German dictionaries by Duden (the main German dictionary publisher) which, sadly, use a closed proprietary data format and their dedicated Duden-Bibliothek application (...
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297 views

Reversing raw byte storage scheme on BusyBox-based network video recorder

I have a network video recorder - the Swann NVR8-7085. It had telnet enabled and I managed to figure out the user/pass to get in (I downloaded the firmware from the site, extracted the squashfs ...
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591 views

Windows Media Player - library format

Is anyone aware of any documentation (official or reverse-engineered) on the Windows Media Player library / database .wmdb format? (Specifically WMP 12). The file resides at C:\Users\[username]\...
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35 views

What is .pb file format?

TL;DR: What file format is this (if it's not a private file format) and how do I parse it? Before I say anything I want to say that I am new to reverse engineering and StackExchange. I am trying to ...
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61 views

Extracting sprites from old DOS game

I'm trying to extract the sprites from the old dos version of Street Fighter 2 The sprites are spread over a couple files (SPRITES1.SF2, SPRITES2.SF2), there is another binary file called INDEX.SF2, ...
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29 views

Decoding an .iwa file

I am looking to view the contents of an .iwa file in my Apple Numbers project. It seems like the format is a protobuf wrapped in snappy. I was wondering if there was a relatively simple/crude way to ...
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20 views

View Apple Numbers file format

I have a very tiny Apply Numbers file: And I have saved it here: https://drive.google.com/file/d/1nyGJan-D9Jn0mddjAZQikFmUHi5ceIya/view?usp=sharing. Is there a way in which I can view the file in a ...
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59 views

Can I reverse engineer original file names?

I'm new to IT and I turned my external hard-drive into a windows boot disc. I managed to recover files with testdisc & photorec_win. The downside is I got more than I bargened for and I have twice ...
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28 views

Cannot find audio file type

I'm trying to find the audio file type of this file (extension wtj) around 8 minutes). I extracted it from a music box. I've tried many things: Open in Winamp and VLC => no luck Open with ...
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129 views

Need help learning to extract and modify PS1 ISO files

I was wanting to make a randomizer for a playstation game, Parasite Eve 2. I've spent a ton of time trying to figure this out just googling around and eventually wound up here. Does anyone have an ...
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248 views

Binwalk on flash dump yielding useless files and empty file systems

I have been investigating some routers by desoldering their nand flash and dumping them using a flash programmer. However when I use binwalk on these dumps I end up with fragments of files mixed in ...
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85 views

What kind of integer obfuscation is this?

I'm looking at the network traffic of a game submitting the user's score to the high-score server. The score value seems to be obfuscated in some way. The score is a non-negative integer, and not more ...
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1answer
72 views

Algorithm for decoding database like file structure

I am working on an automatic decode tool for a database like file structure. The file consists of a header and a body. Information that is known before trying to decode the file: Number of rows and ...
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34 views

Is there a list/property of the vulnerabilities so that, if pentested for, can read but not overwrite the system?

The question is a bit hard to explain, so I go with an example. Suppose the UFO crashed on Earth. The aliens are dead, but their on-board computer is intact. You were tasked to dump the computer's ...
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71 views

I have a .exe program file compiled using Intel Fortran 8.1. for windows 10. Can I edit the code off the .exe file?

I have a .exe program file compiled using Intel Fortran 8.1 for Windows under WinXP with 64-bit Windows 10 system. Can I edit the code off the .exe file? I need to change a value in the code. Thank ...