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
18 Rust crates from crates.io, with the versions it was built with:
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.
| Function | Size | Blocks | Complexity | Notes |
|---|---|---|---|---|
| No functions match. | ||||
File layout
WebAssembly binary format version 1, core module, 11 sections (1 custom).
| Section | Offset | Size | Items |
|---|---|---|---|
| type | 0x8 | 335 bytes | 45 |
| import | 0x157 | 1.1 KiB | 31 |
| function | 0x5da | 580 bytes | 575 |
| table | 0x81e | 9 bytes | 1 |
| memory | 0x827 | 5 bytes | 1 |
| global | 0x82c | 11 bytes | 1 |
| export | 0x837 | 155 bytes | 7 |
| element | 0x8d2 | 336 bytes | 1 |
| code | 0xa22 | 176.6 KiB | 575 |
| data | 0x2cc65 | 47.0 KiB | 49 |
| custom: producers | 0x38832 | 62 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.
- 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.
| Import | Text |
|---|---|
| wbg.__wbg_newnoargs_105ed471475aaf50 | return this |
| wbg.__wbindgen_string_new | crypto |
| wbg.__wbindgen_throw | closure 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.
- PKCS#1 ASN.1 error:
- core/src/str/pattern.rs
- - 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.
Seen on 1 public scan
| Page | Title | Seen | How it got there |
|---|---|---|---|
| search.bilibili.com | 搜索 - 哔哩哔哩_bilibili | 2026-10-15 | Built by a script at run time; Loaded from a data: URL; Embedded in a script |