Unity Unity3d UnityFS

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Unity3d

• Format Type : Archive
  
• Endian Order : Little Endian / Big Endian
  
• Signature : UnityFS
  

Format Specifications

// Unity3d file format

// header
8 bytes (char) - signature + null // "UnityFS"
4 bytes (uint32) - version  // 6 or 7
6 bytes (char) - minimum player version + null  // e.g. "5.x.x."
12 bytes (char) - file engine version + null // e.g. "2017.4.35f1."
8 bytes (uint64) - archive size
4 bytes (uint32) - compressed "info block" data size
4 bytes (uint32) - uncompressed "info block" data size
4 bytes (uint32) - flags


// info block
// Note: this section may be compressed with LZ4
{
   // blocks info
   16 bytes - hash
   4 bytes (uint32) - number of blocks  
   num_of_blocks *
   {
      4 bytes (uint32) - uncompressed block size
      4 bytes (uint32) - compressed block size
      2 bytes (uint16) - flags
   }

   // paths info
   4 bytes (uint32) - number of paths
   num_of_paths *
   {
      8 bytes (uint64) - path location
      8 bytes (uint64) - size of the uncompressed data
      4 bytes (uint32) - flags  // 0x04 - serialized file
      37 bytes (char) - filepath  // e.g. "CAB-c0f952eacf35e09957047188fc534360"
   }
}

   
// data
num_of_files *
{
   x bytes - file data  // may be compressed with LZ4
}  

Notes and Comments

• UnityFS is a new asset bundle format introduced in Unity 5 Engine.
• Files inside archive may be compressed with LZ4 compression method.
• Archive may be partially or fully encrypted with XOR or with AES.
• In some games filenames of unity3d archives may be hashed, for example "06477b71ac17b5740482e85abc24da14" and they don't have any extension.

Games

Games using this file format:

Game Title	Platform	Unity version	Extension	Is encrypted?
A Short Hike	PC	2019.4.28f1	*.BUNDLE	Not encrypted
Alternative girls 2	Android	2019.4.9f1	no extension	Not encrypted
Ares Chronicles	Android / PC	2018.4.18f1	*.UNITY3D	unknown encryption, more info here
Argonavis from BanG Dream! AAside	Android	2019.4.23f1	no extension	encrypted with XOR, key is "CB 69 BF 09"
Atlantis	Android	unknown	*.BUNDLE	unknown encryption, more info here
Blacksad: Under The Skin	PC	2018.4.5f1	no extension	unknown
Blankos Block Party	unknown	2020.3.18f1	no-extension	unknown encryption, more info here.
Brave's Rage	PC	2020.3.22f1c1	no-extension	encrypted with AES, "OOKAMI" signature, script available here
Cardinal Chains	PC	2018.4.36f1	*.UNITY3D	Not encrypted
Cloud Gardens	PC	2020.3.26f1	unknown	Not encrypted
Doula Continent: Soul Master Duel	Android	2019.4.13f1	*.ASSETBUNDLE	unknown encryption
Ensemble Stars	Android	unknown	*.Z	unknown encryption
Figment	PC	2018.2.6f1	no extension	Not encrypted
FunDoll	PC	unknown	*.BYTES	unknown encryption
Game of Nightmares	iOS	2019.4.22f1	no extension	encrypted with XOR, key is "0x0B", more info here
Girl Cafe Gun	PC	unknown	*.U	unknown encryption
Hatsune Miku: Colorful Stage	Android	unknown	unknown	unknown encryption, more info here
Idolish7	Android	unknown	no extension	unknown encryption
KartRider Rush	unknown	unknown	*.UNITY3D	unknown encryption, different signature "FBAU"
Lapis Re:Lights	Android	unknown	*.BDL	unknown encryption, more info here. Possibly first byte of every 7 bytes is XORed with 0xEE.
Life Is Strange: Before the Storm Remastered	PC	2019.4.0f1	*.BYTES	Not encrypted
Marvel Duel	Android	2019.4.21f1	no extension	encrypted using extra 20-bytes header: "MARVEL DUAL PACKAGE " and multiple UnityFS files joined together in one big file. Archives may be splitted with this script.
NEO: The World Ends With You	PC	unknown	*.UNITY3D	encrypted with AES-128-CBC, read more here
Promesa	PC	2018.4.29f1	*.BUNDLE	Not encrypted
Punishing: Gray Raven (version 1.9.1 and older)	Android	2017.4.35f1	no extension	encrypted using extra 4-bytes header "Kuro" added before "UnityFS" signature
Ragnarok Origin	Android	2018.4.15f1	*.BLOCK	unknown encryption
Return to Empire (Age of Empires Mobile)	Android	2019.4.0f1.2	*.K	unknown encryption (missing header?)
Shadowverse	Android	2018.4.24f1	*.UNITY3D	unknown
The Land of Douluo: Soul Master Showdown	Android	2019.4.13f1	*.ASSETBUNDLE	unknown encryption, more info here.
Wings of Destiny M	Android	2018.4.24f1	*.UNITY3D	unknown encryption, more info here
Xproject	Android	unknown	no extension	unknown encryption, more info here

quickBMS Scripts

See List of Unity Tools article on this wiki.

Compatible Programs

See List of Unity Tools article on this wiki.

See Also

• Analysis of Asset Bundle Format
• Deep dive into UnityFS
• Unity Assets file format

Gallery

• 

  UABE

• 

  UnityEx

• 

  AssetStudio