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WebAssembly module
API
This view is built from:
Module analysis/api/v1/wasm/c5e7fd13c6485a3ac9f476dfef2b740d99e2ffc288f7768f94b652708c514184Decompiled code/api/v1/wasm/c5e7fd13c6485a3ac9f476dfef2b740d99e2ffc288f7768f94b652708c514184/code

c5e7fd13c6485a3ac9f476dfef2b740d99e2ffc288f7768f94b652708c514184

Known library: .NET runtimeHashing 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
Known library: .NET runtime.
Names it came with
File name: dotnet-native. Its build and the addresses it came from say so; whoever builds a module chooses these, so they are hints.
How it was built
Compiled with Emscripten, usually from C or C++.
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
1.4 MiB
First seen
2026-10-17
Last seen
2026-10-17
Public scans
1
Functions
5545
Imports
65
Exports
189
Data segments
1727

Analysis limits

Only its first 2,000 strings were read.

How it was built

Compiled with Emscripten, usually from C or C++.

Language
C or C++, probablyNot named. Emscripten and clang mostly compile C and C++.
Compiler
EmscriptenThe toolchain that compiles C and C++ (sometimes Rust) for the web. It comes with the JavaScript that loads the module.
System interface
WASIStandard calls for clocks, random numbers and files. In a browser the page's own JavaScript provides them.
Compiler backend
LLVMThe code generator behind rustc, clang, Emscripten and TinyGo.

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.

Hashing and cipher code

Algorithms recognised from their published constants, tables and rotation amounts: CRC-32, SHA-1. Legitimate modules use them all the time, for hashing, captchas and encryption, so this is a lead, not a verdict.

  • function 1621SHA-1 ·
  • function 1623SHA-1 · constants in its code

Decompiled code

5,543 of 5,545 functions decompiled to C-like pseudocode; 65 more are imported from the page.

  • 2 of 5,545 functions could not be decompiled.

Beyond WebAssembly 1.0: Exception handling (11 functions), Vector (SIMD) instructions (281 functions).

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, 12 sections.

SectionOffsetSizeItems
type0x8824 bytes111
import0x3401.9 KiB65
function0xab75.4 KiB5,545
table0x20657 bytes1
memory0x206c9 bytes1
tag0x20755 bytes
global0x207a21 bytes3
export0x208f4.5 KiB189
element0x328f3.2 KiB1
datacount0x3f6b4 bytes
code0x3f6f1.1 MiB5,545
data0x1115ba384.0 KiB1,727
Memory
512 pages (32.0 MiB), up to 32,768 pages (2.0 GiB)
Table
1,646 entries, no upper limit, funcref
Globals
3
Element segments
1
Declared data segments
1,727
Exception tags
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. 1,727 segments, 371.9 KiB in all. The chart shows 64: the first 64 and every encrypted or compressed one.

1,663 segments not drawn (260.1 KiB)02468Segment 0: 105,218 bytes, 5.18 bits per byteSegment 1: 1,380 bytes, 7.03 bits per byteSegment 2: 691 bytes, 1.94 bits per byteSegment 3: 37 bytes, 0.75 bits per byteSegment 4: 105 bytes, 1.08 bits per byteSegment 5: 41 bytes, 0.84 bits per byteSegment 6: 33 bytes, 0.85 bits per byteSegment 7: 161 bytes, 1.16 bits per byteSegment 9: 537 bytes, 1.01 bits per byteSegment 11: 81 bytes, 0.88 bits per byteSegment 12: 41 bytes, 1.24 bits per byteSegment 13: 773 bytes, 1.13 bits per byteSegment 14: 177 bytes, 0.98 bits per byteSegment 15: 53 bytes, 1.13 bits per byteSegment 16: 221 bytes, 1.05 bits per byteSegment 18: 133 bytes, 1.07 bits per byteSegment 19: 21 bytes, 0.86 bits per byteSegment 20: 5 bytes, 0.97 bits per byteSegment 21: 93 bytes, 0.82 bits per byteSegment 22: 41 bytes, 0.84 bits per byteSegment 23: 41 bytes, 0.84 bits per byteSegment 24: 105 bytes, 0.82 bits per byteSegment 25: 9 bytes, 0.92 bits per byteSegment 26: 25 bytes, 0.86 bits per byteSegment 27: 65 bytes, 0.83 bits per byteSegment 29: 65 bytes, 0.81 bits per byteSegment 30: 669 bytes, 0.81 bits per byteSegment 31: 157 bytes, 0.82 bits per byteSegment 32: 17 bytes, 0.87 bits per byteSegment 33: 49 bytes, 0.83 bits per byteSegment 34: 221 bytes, 0.82 bits per byteSegment 35: 101 bytes, 0.82 bits per byteSegment 36: 21 bytes, 0.86 bits per byteSegment 37: 9 bytes, 0.92 bits per byteSegment 38: 21 bytes, 0.79 bits per byteSegment 41: 233 bytes, 1.17 bits per byteSegment 42: 17 bytes, 1.56 bits per byteSegment 43: 45 bytes, 1.1 bits per byteSegment 44: 49 bytes, 1.25 bits per byteSegment 45: 681 bytes, 1.39 bits per byteSegment 46: 5 bytes, 1.37 bits per byteSegment 47: 13 bytes, 1.2 bits per byteSegment 48: 5 bytes, 0.97 bits per byteSegment 49: 5 bytes, 0.97 bits per byteSegment 50: 85 bytes, 1.15 bits per byteSegment 52: 41 bytes, 1.13 bits per byteSegment 53: 5 bytes, 1.37 bits per byteSegment 54: 41 bytes, 0.98 bits per byteSegment 55: 13 bytes, 1.14 bits per byteSegment 57: 17 bytes, 1.09 bits per byteSegment 58: 9 bytes, 1.22 bits per byteSegment 59: 1,585 bytes, 5.08 bits per byteSegment 61: 69 bytes, 1.31 bits per byteSegment 62: 17 bytes, 0.95 bits per byteSegment 63: 135 bytes, 4.28 bits per byte
data segment encrypted or compressed 1,663 segments not drawn 7.5 bits per byteHeight: bits per byte. Width: share of all the data.

Imports (65)

  • env.__assert_fail
  • env.mono_wasm_trace_logger
  • env.abort
  • env.emscripten_force_exit
  • env.exit
  • env.mono_wasm_bind_js_import_ST
  • env.mono_wasm_invoke_jsimport_ST
  • env.mono_wasm_release_cs_owned_object
  • env.mono_wasm_resolve_or_reject_promise
  • env.mono_wasm_invoke_js_function
  • env.mono_wasm_cancel_promise
  • env.mono_wasm_console_clear
  • env.mono_wasm_get_locale_info
  • env.mono_wasm_set_entrypoint_breakpoint
  • env.mono_interp_tier_prepare_jiterpreter
  • env.mono_interp_jit_wasm_entry_trampoline
  • env.mono_interp_invoke_wasm_jit_call_trampoline
  • env.mono_interp_jit_wasm_jit_call_trampoline
  • env.mono_interp_flush_jitcall_queue
  • env.mono_interp_record_interp_entry
  • env.mono_wasm_free_method_data
  • env.strftime
  • env.mono_wasm_process_current_pid
  • env.schedule_background_exec
  • env.mono_wasm_schedule_timer
  • env.mono_wasm_browser_entropy
  • wasi_snapshot_preview1.environ_sizes_get
  • wasi_snapshot_preview1.environ_get
  • env.__syscall_faccessat
  • wasi_snapshot_preview1.fd_close
  • env.emscripten_date_now
  • env._emscripten_get_now_is_monotonic
  • env.emscripten_get_now
  • env.emscripten_get_now_res
  • env.__syscall_fcntl64
  • env.__syscall_openat
  • env.__syscall_ioctl
  • wasi_snapshot_preview1.fd_write
  • wasi_snapshot_preview1.fd_read
  • env.__syscall_fstat64
  • env.__syscall_stat64
  • env.__syscall_newfstatat
  • env.__syscall_lstat64
  • wasi_snapshot_preview1.fd_sync
  • env.__syscall_ftruncate64
  • env.__syscall_getcwd
  • wasi_snapshot_preview1.fd_seek
  • env.__syscall_mkdirat
  • env._localtime_js
  • env._gmtime_js

Exports (189)

Scripts that carry or load it

  • hospitality.fulhamfc.com loads it.

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
env.__assert_failC:\Program Files\dotnet\packs\Microsoft.NETCore.App.Runtime.Mono.browser-wasm\10.0.12\runtimes\browser-wasm\native\src\r
env.__assert_failmono_wasm_marshal_get_managed_wrapper
env.__assert_failklass
env.__assert_failmanagedWrapper
env.__assert_failC:\Program Files\dotnet\packs\Microsoft.NETCore.App.Runtime.Mono.browser-wasm\10.0.12\runtimes\browser-wasm\native\src
env.__assert_failmono_wasm_add_assembly
env.__assert_failC:\Program Files\dotnet\packs\Microsoft.NETCore.App.Runtime.Mono.browser-wasm\10.0.12\runtimes\browser-wasm\native\src\d
env.__assert_failmono_wasm_add_satellite_assembly
env.__assert_failnum_char > 0 && num_char == id_len
env.__assert_failsatellite_assembly_name
env.__assert_failsatellite_assembly_culture
env.__assert_failslots
env.__assert_failhandle != sysglobal_native_handle
env.__assert_failwasm_dl_symbol
env.__assert_failC:\Program Files\dotnet\packs\Microsoft.NETCore.App.Runtime.Mono.browser-wasm\10.0.12\runtimes\browser-wasm\native\sr
env.__assert_failmono_wasm_assembly_get_entry_point
env.__assert_failC:\Program Files\dotnet\packs\Microsoft.NETCore.App.Runtime.Mono.browser-wasm\10.0.12\runtimes\browser-wasm\native\src\c
env.__assert_failmono_wasm_bind_assembly_exports
env.__assert_failmono_wasm_get_assembly_export
env.__assert_failmono_wasm_setenv
env.__assert_faillength >= 0
env.__assert_failmono_wasm_string_from_utf16_ref
env.__assert_failC:\Program Files\dotnet\packs\Microsoft.NETCore.App.Runtime.Mono.browser-wasm\10.0.12\runtimes\browser-
env.__assert_fail_mono_wasm_assembly_load
env.__assert_failaname
env.__assert_failC:\Program Files\dotnet\packs\Microsoft.NETCore.App.Runtime.Mono.browser-wasm\10.0.12\runtimes\browser-was
env.__assert_failmono_wasm_assembly_find_class
env.__assert_failmono_wasm_assembly_find_method
env.__assert_failC:\Program Files\dotnet\packs\Microsoft.NETCore.App.Runtime.Mono.browser-wasm\10.0.12\runtimes\browser-wasm\native\s
env.__assert_failicall_table_lookup

Showing 30 of 37.

In our sandbox

  • Produced 8 strings at run time, listed below.
  • Ran a long busy loop (often hashing).

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. /__w/1/s/src/runtime/src/mono/mono/sgen/sgen-internal.c:120 <disabled>
  2. /__w/1/s/src/runtime/src/mono/mono/sgen/sgen-int
  3. /__w/1/s/src/runtime/src/mono/mono/sgen/sgen-internal.c:120 <disabled>/__w/1/s/src/runtime/src/mono/mono/sgen/sgen-inter
  4. (null)/(null)
  5. /__w/1/s/src
  6. /mono/mono/sgen/sgen-int
  7. <disabled>' not met
  8. 1/s/src/runtime/src/mono/mon

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: CRC-32, SHA-1
  • 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.

  • 253c5777…b0363d2.9 MiB · first seen 2026-10-08 · 622 functions in common (28% of this module's, 15% of that one's)
  • fff19979…9f7df92.9 MiB · first seen 2026-10-18 · 622 functions in common (28% of this module's, 15% of that one's)
  • 26ad7a0c…a549eb2.9 MiB · first seen 2026-10-03 · 620 functions in common (28% of this module's, 15% of that one's)
  • 7fa6fc38…4bee822.8 MiB · first seen 2026-10-05 · 330 functions in common (15% of this module's, 8% of that one's)
  • b3a1014c…ae72e42.8 MiB · first seen 2026-10-16 · 330 functions in common (15% of this module's, 8% of that one's)

Seen on 1 public scan

PageTitleSeenHow it got there
hospitality.fulhamfc.comFulham v Hull City Hospitality | The Riverside | Fulham2026-10-17Built by a script at run time; Downloaded as a file