4fb01b1895e824517bdea6adad1fbb4c061226ad4773f0e925b0097c1ddddb59

How it was built

Written in Rust. wasm-bindgen connects it to the page's JavaScript.

Language

RustImplied: wasm-bindgen is only used with Rust.

Connects to JavaScript

wasm-bindgenRust's bridge to JavaScript. It writes glue code on both sides, so the module can call page functions such as fetch or the DOM, and the page can call the module.

Read from text inside the module (its build metadata and paths the compiler left) and from its import and export names. Whoever builds a module can change or remove these, so treat them as hints. They say how a module was made, not what it does.

What it is made of

Hashing and cipher code

Algorithms recognised from their published constants, tables and rotation amounts: BLAKE2b, BLAKE2s or BLAKE3, Blowfish, CRC-32, ChaCha20, Keccak (SHA-3), SHA-1 or RIPEMD-160, SHA-256, SHA-512, SHA-512 or BLAKE2b, Salsa20, Salsa20 or ChaCha. Legitimate modules use them all the time, for hashing, captchas and encryption, so this is a lead, not a verdict.

• function 299BLAKE2b · constants in its code, its rotation amounts
• function 301SHA-512 · a table it reads, its rotation amounts
• function 310SHA-256, SHA-512 · a table it reads, its rotation amounts
• function 342BLAKE2b · constants in its code, its rotation amounts
• function 366BLAKE2s or BLAKE3 · constants in its code, its rotation amounts
• function 550BLAKE2b · its rotation amounts
• function 663ChaCha20 · its rotation amounts
• function 691Salsa20 or ChaCha · a table it reads
• function 952Keccak (SHA-3) · its rotation amounts
• function 1007Blowfish · a table it reads
• function 1203Keccak (SHA-3) · its rotation amounts
• function 1691ChaCha20, Salsa20 or ChaCha · constants in its code, a table it reads, its rotation amounts
• function 1830Salsa20 ·
• function 1857SHA-512 or BLAKE2b · constants in its code
• function 2557Salsa20 or ChaCha · a table it reads
• function 4189Salsa20 or ChaCha · a table it reads
• function 4553BLAKE2b · its rotation amounts
• function 5026SHA-512 or BLAKE2b · constants in its code
• function 5480ChaCha20 · its rotation amounts
• function 5489Salsa20 · its rotation amounts

Showing 20 of 22 functions.

Decompiled code

15,542 of 15,557 functions decompiled to C-like pseudocode; 291 more are imported from the page.

• 15 of 15,557 functions could not be decompiled.

Decompiled code is a reconstruction from the file, so names and types are often guesses. Query values in URLs are masked here; the downloaded file is unchanged.

File layout

WebAssembly binary format version 1, core module, 11 sections (1 custom).

Memory

46 pages (2.9 MiB), no upper limit

Table

4,435 entries, up to 4,435 entries, funcref

Globals

1

Element segments

1

Function names

none (names were stripped)

Data segments

Each bar is one segment of the module's data: as wide as its size, as tall as its entropy. Bars above the dashed line are encrypted or compressed. 4,144 segments, 1.8 MiB in all. The chart shows 65: the first 64 and every encrypted or compressed one.

• Segment 752: 4,962 bytes at 7.76 bits per byte

Scripts that carry or load it

• vault.bitwarden.com loads it; the script is minified or bundled.

From public scans. A script loads a module when it fetches or compiles it.

Text it passes to the page

Fixed text the module hands to the page's JavaScript when it calls an import, read from the module file. Imports that reach the network, run code or change the page come first; web addresses are shown as their host.

In our sandbox

• Produced 9 strings at run time, listed below.
• Cleared 7 data segments while running: memory reused, not decryption.

Checks we ran

• Threat-feed matches: none
• Names of mining software or pools: none
• CryptoNight mining structure: not found
• Hashing or cipher loops: 17 functions (common in codecs and captchas)
• Known hashing or cipher algorithms: BLAKE2b, BLAKE2s or BLAKE3, Blowfish, CRC-32, ChaCha20, Keccak (SHA-3), SHA-1 or RIPEMD-160, SHA-256, SHA-512, SHA-512 or BLAKE2b, Salsa20, Salsa20 or ChaCha
• Encrypted or compressed data: 1 block, 4.8 KiB (0.3% of its data)
• JavaScript stored inside: none
• Other modules inside: none
• Imports that read browser or page details: 2
• Function names: removed (usual in release builds)

Static checks of the file: nothing in it was run for these. A finding is a lead, not a verdict.

Shares code with

Other modules that contain some of the same functions. They are ranked by functions few modules have, so a language's own runtime does not link every module built with it. Shared code often means a shared library or the same developer. It is a lead, not a verdict.

• f754e515…b79c52643.9 KiB · first seen 2026-10-24 · 75 functions in common (1% of this module's, 10% of that one's)

Seen on 1 public scan