f28f166985a262a8e2980348c0f25e95f37f1a76e96b6e9474f051bc4483f317

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
From s1.hdslb.com. 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
Its imports reach: cryptography. Judged from the names of its imports.
Where we saw it
On 1 public scan, 2026-10-15.
Findings
Hashing or cipher loops. Leads, not verdicts: legitimate modules show these too.
Size
226.1 KiB
First seen
2026-10-15
Last seen
2026-10-15
Public scans
1
Functions
575
Imports
31
Exports
7
Data segments
49

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

Build tools and versions it names:

  • walrus 0.23.3
  • wasm-bindgen 0.2.100

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.

Decompiled code

574 of 575 functions decompiled to C-like pseudocode; 31 more are imported from the page.

  • 1 of 575 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.

FunctionSizeBlocksComplexityNotes
No functions match.

File layout

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

SectionOffsetSizeItems
type0x8335 bytes45
import0x1571.1 KiB31
function0x5da580 bytes575
table0x81e9 bytes1
memory0x8275 bytes1
global0x82c11 bytes1
export0x837155 bytes7
element0x8d2336 bytes1
code0xa22176.6 KiB575
data0x2cc6547.0 KiB49
custom: producers0x3883262 bytes
Memory
17 pages (1.1 MiB), no upper limit
Table
169 entries, up to 169 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. 49 segments, 46.5 KiB in all.

02468Segment 0: 755 bytes, 5.08 bits per byteSegment 1: 217 bytes, 4.78 bits per byteSegment 2: 197 bytes, 4.76 bits per byteSegment 3: 906 bytes, 5.15 bits per byteSegment 5: 833 bytes, 5.14 bits per byteSegment 6: 3,274 bytes, 5.96 bits per byteSegment 7: 5,578 bytes, 5.36 bits per byteSegment 8: 2,529 bytes, 4.77 bits per byteSegment 9: 165 bytes, 4.27 bits per byteSegment 10: 957 bytes, 5.03 bits per byteSegment 11: 51 bytes, 2.96 bits per byteSegment 12: 881 bytes, 5.04 bits per byteSegment 13: 1,249 bytes, 5.29 bits per byteSegment 14: 3,653 bytes, 7.43 bits per byteSegment 16: 1,281 bytes, 2.02 bits per byteSegment 21: 2 bytes, 1 bits per byteSegment 22: 2 bytes, 1 bits per byteSegment 23: 2 bytes, 1 bits per byteSegment 24: 3 bytes, 1.58 bits per byteSegment 25: 3 bytes, 1.58 bits per byteSegment 26: 3 bytes, 1.58 bits per byteSegment 27: 3 bytes, 1.58 bits per byteSegment 28: 4 bytes, 2 bits per byteSegment 29: 4 bytes, 2 bits per byteSegment 30: 4 bytes, 2 bits per byteSegment 31: 5 bytes, 2.32 bits per byteSegment 32: 5 bytes, 2.32 bits per byteSegment 33: 5 bytes, 2.32 bits per byteSegment 34: 6 bytes, 2.58 bits per byteSegment 35: 6 bytes, 2.58 bits per byteSegment 36: 6 bytes, 2.58 bits per byteSegment 37: 6 bytes, 2.58 bits per byteSegment 38: 7 bytes, 2.81 bits per byteSegment 39: 7 bytes, 2.81 bits per byteSegment 40: 10,316 bytes, 6.79 bits per byteSegment 41: 1,588 bytes, 6.08 bits per byteSegment 42: 5 bytes, 2.32 bits per byteSegment 43: 2,904 bytes, 5.68 bits per byteSegment 44: 51 bytes, 1.3 bits per byteSegment 45: 4,675 bytes, 6.3 bits per byteSegment 47: 49 bytes, 1.11 bits per byteSegment 17: 5,457 bytes, 7.93 bits per byte
data segment encrypted or compressed 7.5 bits per byteHeight: bits per byte. Width: share of all the data.
  • Segment 17: 5,457 bytes at 7.93 bits per byte

Imports (31)

Can reach: crypto.

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.__wbindgen_string_new
  • wbg.__wbindgen_object_drop_ref
  • wbg.__wbindgen_is_object
  • wbg.__wbg_crypto_574e78ad8b13b65f
  • wbg.__wbg_process_dc0fbacc7c1c06f7
  • wbg.__wbg_versions_c01dfd4722a88165
  • wbg.__wbg_node_905d3e251edff8a2
  • wbg.__wbindgen_is_string
  • wbg.__wbg_require_60cc747a6bc5215a
  • wbg.__wbg_msCrypto_a61aeb35a24c1329
  • wbg.__wbg_randomFillSync_ac0988aba3254290
  • wbg.__wbg_getRandomValues_b8f5dbd5f3995a9e
  • wbg.__wbindgen_is_function
  • wbg.__wbg_newnoargs_105ed471475aaf50
  • wbg.__wbindgen_is_undefined
  • wbg.__wbg_call_672a4d21634d4a24
  • wbg.__wbg_call_7cccdd69e0791ae2
  • wbg.__wbindgen_object_clone_ref
  • wbg.__wbg_buffer_609cc3eee51ed158
  • wbg.__wbg_static_accessor_GLOBAL_THIS_56578be7e9f832b0
  • wbg.__wbg_static_accessor_SELF_37c5d418e4bf5819
  • wbg.__wbg_static_accessor_WINDOW_5de37043a91a9c40
  • wbg.__wbg_static_accessor_GLOBAL_88a902d13a557d07
  • wbg.__wbg_newwithbyteoffsetandlength_d97e637ebe145a9a
  • wbg.__wbg_new_a12002a7f91c75be
  • wbg.__wbg_newwithlength_a381634e90c276d4
  • wbg.__wbg_subarray_aa9065fa9dc5df96
  • wbg.__wbg_set_65595bdd868b3009
  • wbg.__wbindgen_debug_string
  • wbg.__wbindgen_throw
  • wbg.__wbindgen_memory

Exports (7)

Scripts that carry or load it

  • s1.hdslb.com carries it as text and 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.

ImportText
wbg.__wbg_newnoargs_105ed471475aaf50return this
wbg.__wbindgen_string_newcrypto
wbg.__wbindgen_throwclosure invoked recursively or after being dropped

In our sandbox

  • Produced 3 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. PKCS#1 ASN.1 error:
  2. core/src/str/pattern.rs
  3. - EOF while parsing a value at line 1 column 0

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: none recognised
  • Encrypted or compressed data: none
  • JavaScript stored inside: none
  • Other modules inside: none
  • Imports that read browser or page details: 1
  • 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.

  • 4eb7b21e…cfee2d35.2 KiB · first seen 2026-10-05 · 12 functions in common (4% of this module's, 34% of that one's)
  • fe802a87…76a6d997.6 KiB · first seen 2026-10-20 · 12 functions in common (4% of this module's, 14% of that one's)
  • 6e45ba2c…cd5f7844.9 KiB · first seen 2026-10-16 · 8 functions in common (3% of this module's, 14% of that one's)
  • 1edcf456…31803059.8 KiB · first seen 2026-10-04 · 8 functions in common (3% of this module's, 11% of that one's)

Seen on 1 public scan

PageTitleSeenHow it got there
search.bilibili.com搜索 - 哔哩哔哩_bilibili2026-10-15Built by a script at run time; Loaded from a data: URL; Embedded in a script