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WebAssembly module
API
This view is built from:
Module analysis/api/v1/wasm/4f80b2f95ba3d1e499c290d20718f91e3d6c356f9ee1dc3eba57d86bbb5b47fbDecompiled code/api/v1/wasm/4f80b2f95ba3d1e499c290d20718f91e3d6c356f9ee1dc3eba57d86bbb5b47fb/code

4f80b2f95ba3d1e499c290d20718f91e3d6c356f9ee1dc3eba57d86bbb5b47fb

Hashing or cipher loops
Download .wasmSearch scans with this module

The file is the module exactly as the page had it. WebAssembly does nothing on its own: it runs only when a script instantiates it. Labels describe what the module contains and are leads, not verdicts.

At a glance

What it is
Not identified. Its build does not name it and it matches no library we know.
Names it came with
File name: stark-crypto-wrapper-wasm. Its build and the addresses it came from say so; whoever builds a module chooses these, so they are hints.
How it was built
Written in Rust. wasm-bindgen connects it to the page's JavaScript.
What it can do
None of its imports reaches the network, runs code or changes the page. Judged from the names of its imports.
Where we saw it
On 1 public scan, 2026-10-17.
Findings
Hashing or cipher loops. Leads, not verdicts: legitimate modules show these too.
Size
219.1 KiB
First seen
2026-10-17
Last seen
2026-10-17
Public scans
1
Functions
205
Imports
2
Exports
17
Data segments
31

How it was built

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

Language
RustThe Rust compiler (rustc) left its name in the module.
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.
Rewritten after compiling
walrusA library for rewriting compiled modules. wasm-bindgen runs it on every build, so it comes with wasm-bindgen and says nothing more about 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

8 Rust crates from crates.io, with the versions it was built with:

Build tools and versions it names:

  • Rust
  • rustc 1.91.0 (f8297e351 2025-10-28)
  • walrus 0.23.3
  • wasm-bindgen 0.2.104 (4ea9d98ce)

Read from text the build left in the module: source paths, build metadata and .NET metadata. Whoever builds a module can change or remove it, so treat it as a hint.

Hashing and cipher code

Algorithms recognised from their published constants, tables and rotation amounts: SHA-256. Legitimate modules use them all the time, for hashing, captchas and encryption, so this is a lead, not a verdict.

  • function 4SHA-256 · its rotation amounts
  • function 9SHA-256 · a table it reads
  • function 11SHA-256 · a table it reads
  • function 24SHA-256 · a table it reads
  • generate_private_key_from_eth_signatureSHA-256 · a table it reads

Decompiled code

205 of 205 functions decompiled to C-like pseudocode; 2 more are imported from the page.

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.

FunctionSizeBlocksComplexityNotes
No functions match.

File layout

WebAssembly binary format version 1, core module, 13 sections (2 custom).

SectionOffsetSizeItems
type0x8261 bytes27
import0x10d84 bytes2
function0x161210 bytes205
table0x23311 bytes2
memory0x23e5 bytes1
global0x24311 bytes1
export0x24e359 bytes17
element0x3b5138 bytes1
datacount0x43f3 bytes
code0x442196.3 KiB205
data0x3158521.5 KiB31
custom: producers0x36b82126 bytes
custom: target_features0x36c00109 bytes
Memory
17 pages (1.1 MiB), no upper limit
Table 0
76 entries, up to 76 entries, funcref
Table 1
128 entries, no upper limit, externref
Globals
1
Element segments
1
Declared data segments
31
Function names
none (names were stripped)
Target features
+mutable-globals +nontrapping-fptoint +bulk-memory +sign-ext +reference-types +multivalue

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. 31 segments, 21.2 KiB in all.

02468Segment 0: 6,311 bytes, 5.5 bits per byteSegment 1: 152 bytes, 5.07 bits per byteSegment 2: 257 bytes, 5.24 bits per byteSegment 3: 49 bytes, 3.03 bits per byteSegment 4: 249 bytes, 4.22 bits per byteSegment 5: 221 bytes, 4.65 bits per byteSegment 7: 165 bytes, 3.86 bits per byteSegment 8: 81 bytes, 4.12 bits per byteSegment 9: 144 bytes, 2.91 bits per byteSegment 10: 8 bytes, 1.06 bits per byteSegment 11: 4,625 bytes, 7.42 bits per byteSegment 12: 5 bytes, 2.32 bits per byteSegment 13: 21 bytes, 3.46 bits per byteSegment 14: 53 bytes, 3.69 bits per byteSegment 15: 117 bytes, 4.25 bits per byteSegment 16: 245 bytes, 4.57 bits per byteSegment 17: 501 bytes, 4.58 bits per byteSegment 18: 1,013 bytes, 4.67 bits per byteSegment 19: 157 bytes, 2.38 bits per byteSegment 20: 5 bytes, 1.92 bits per byteSegment 21: 21 bytes, 2.25 bits per byteSegment 22: 53 bytes, 2.26 bits per byteSegment 23: 117 bytes, 2.49 bits per byteSegment 24: 245 bytes, 2.7 bits per byteSegment 25: 501 bytes, 2.81 bits per byteSegment 26: 1,013 bytes, 2.96 bits per byteSegment 27: 1,569 bytes, 4.21 bits per byteSegment 28: 3,842 bytes, 6.6 bits per byte
data segment encrypted or compressed 7.5 bits per byteHeight: bits per byte. Width: share of all the data.

Imports (2)

Imports from wbg are wasm-bindgen glue. Each __wbg_… import calls one JavaScript function in the page, and its name says which (__wbg_fetch_… calls fetch). The __wbindgen_… imports are wasm-bindgen's own helpers for strings, errors and memory.

  • wbg.__wbg_wbindgenthrow_451ec1a8469d7eb6
  • wbg.__wbindgen_init_externref_table

Exports (17)

Scripts that carry or load it

  • app.extended.exchange loads it; the script is minified or bundled.

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

In our sandbox

  • Produced 4 strings at run time, listed below.

Strings it produced at run time

Text that appeared while it ran and is not in the file: decoded, decrypted or built by its code. Web addresses are shown as their host.

  1. attempted to take ownership of Rust value while it was borrowed/home/runner/.cargo/registry/src/index.crates.io-1949cf8c
  2. Invalid signature length
  3. Invalid base_asset_id_hex: FromStrError(EmptyString)
  4. Invalid collateral_id_hex: FromStrError(EmptyString)

Checks we ran

  • Threat-feed matches: none
  • Names of mining software or pools: none
  • CryptoNight mining structure: not found
  • Hashing or cipher loops: 1 function (common in codecs and captchas)
  • Known hashing or cipher algorithms: SHA-256
  • Encrypted or compressed data: none
  • JavaScript stored inside: none
  • Other modules inside: none
  • Imports that read browser or page details: none
  • 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.

  • ffbb49b4…7b418e1.4 MiB · first seen 2026-10-27 · 13 functions in common (10% of this module's, 1% of that one's)
  • 1edcf456…31803059.8 KiB · first seen 2026-10-04 · 8 functions in common (6% of this module's, 11% of that one's)

Seen on 1 public scan

PageTitleSeenHow it got there
app.extended.exchange81,361 USD | BTC-USD | Extended2026-10-17Downloaded as a file