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WebAssembly module
API
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Module analysis/api/v1/wasm/da25c5dc95e7288f601b7f6666b44a1a2b3e41c238a9ac2b81cab3f5f522ea0bDecompiled code/api/v1/wasm/da25c5dc95e7288f601b7f6666b44a1a2b3e41c238a9ac2b81cab3f5f522ea0b/code

da25c5dc95e7288f601b7f6666b44a1a2b3e41c238a9ac2b81cab3f5f522ea0b

Known library: .NET runtimeDense dataHashing 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. 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, 2026-10-23.
Findings
Dense data, Hashing or cipher loops. Leads, not verdicts: legitimate modules show these too.
Size
2.4 MiB
First seen
2026-10-23
Last seen
2026-10-23
Public scans
1
Functions
8904
Imports
98
Exports
99
Data segments
1838

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 2222SHA-1 ·
  • function 2223SHA-1 · constants in its code

Decompiled code

8,903 of 8,904 functions decompiled to C-like pseudocode; 98 more are imported from the page.

  • 1 of 8,904 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, 10 sections.

SectionOffsetSizeItems
type0x82.1 KiB248
import0x86d2.4 KiB98
function0x12038.7 KiB8,904
table0x34ef9 bytes1
memory0x34f89 bytes1
global0x350121 bytes3
export0x35162.1 KiB99
element0x3d9d8.1 KiB1
code0x5e261.8 MiB8,904
data0x1db6ef516.2 KiB1,838
Memory
256 pages (16.0 MiB), up to 32,768 pages (2.0 GiB)
Table
4,172 entries, up to 4,172 entries, funcref
Globals
3
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. 1,838 segments, 503.3 KiB in all. The chart shows 65: the first 64 and every encrypted or compressed one.

1,773 segments not drawn (398.6 KiB)02468Segment 0: 93,766 bytes, 5.43 bits per byteSegment 2: 21 bytes, 0.7 bits per byteSegment 3: 105 bytes, 1.08 bits per byteSegment 4: 41 bytes, 0.84 bits per byteSegment 5: 29 bytes, 0.85 bits per byteSegment 6: 137 bytes, 1.18 bits per byteSegment 8: 569 bytes, 1.03 bits per byteSegment 9: 81 bytes, 0.81 bits per byteSegment 10: 33 bytes, 1.26 bits per byteSegment 11: 773 bytes, 1.13 bits per byteSegment 12: 181 bytes, 0.94 bits per byteSegment 13: 13 bytes, 0.99 bits per byteSegment 14: 217 bytes, 0.99 bits per byteSegment 15: 53 bytes, 1.18 bits per byteSegment 17: 125 bytes, 0.82 bits per byteSegment 18: 41 bytes, 0.84 bits per byteSegment 19: 37 bytes, 0.84 bits per byteSegment 20: 81 bytes, 0.83 bits per byteSegment 21: 5 bytes, 0.97 bits per byteSegment 22: 97 bytes, 0.81 bits per byteSegment 24: 69 bytes, 0.81 bits per byteSegment 25: 669 bytes, 0.81 bits per byteSegment 26: 193 bytes, 0.76 bits per byteSegment 27: 9 bytes, 0.92 bits per byteSegment 28: 209 bytes, 0.82 bits per byteSegment 29: 21 bytes, 0.86 bits per byteSegment 30: 21 bytes, 0.86 bits per byteSegment 33: 237 bytes, 1.18 bits per byteSegment 34: 17 bytes, 1.56 bits per byteSegment 35: 21 bytes, 0.86 bits per byteSegment 36: 57 bytes, 1.26 bits per byteSegment 37: 693 bytes, 1.36 bits per byteSegment 38: 5 bytes, 1.37 bits per byteSegment 39: 13 bytes, 1.2 bits per byteSegment 40: 13 bytes, 0.99 bits per byteSegment 41: 53 bytes, 0.9 bits per byteSegment 42: 93 bytes, 1.09 bits per byteSegment 43: 9 bytes, 0.99 bits per byteSegment 44: 17 bytes, 1.26 bits per byteSegment 46: 114 bytes, 2.24 bits per byteSegment 47: 6 bytes, 1.92 bits per byteSegment 48: 6 bytes, 1.92 bits per byteSegment 49: 6 bytes, 1.92 bits per byteSegment 50: 6 bytes, 1.92 bits per byteSegment 51: 6 bytes, 1.92 bits per byteSegment 52: 6 bytes, 1.92 bits per byteSegment 53: 6 bytes, 1.92 bits per byteSegment 54: 6 bytes, 1.92 bits per byteSegment 55: 13 bytes, 2.03 bits per byteSegment 56: 5 bytes, 1.37 bits per byteSegment 57: 5 bytes, 1.37 bits per byteSegment 58: 5 bytes, 1.37 bits per byteSegment 59: 5 bytes, 1.37 bits per byteSegment 60: 5 bytes, 1.37 bits per byteSegment 61: 5 bytes, 1.37 bits per byteSegment 62: 5 bytes, 0.97 bits per byteSegment 63: 6 bytes, 1.92 bits per byteSegment 85: 8,225 bytes, 7.94 bits per byte
data segment encrypted or compressed 1,773 segments not drawn 7.5 bits per byteHeight: bits per byte. Width: share of all the data.
  • Segment 85: 8,225 bytes at 7.94 bits per byte

Imports (98)

  • env.__assert_fail
  • env.mono_wasm_invoke_js_blazor
  • env.mono_wasm_invoke_js_marshalled
  • env.mono_wasm_invoke_js_unmarshalled
  • env.emscripten_asm_const_int
  • env.exit
  • env.mono_wasm_invoke_js_with_args
  • env.mono_wasm_get_object_property
  • env.mono_wasm_get_by_index
  • env.mono_wasm_set_object_property
  • env.mono_wasm_set_by_index
  • env.mono_wasm_get_global_object
  • env.mono_wasm_create_cs_owned_object
  • env.mono_wasm_release_cs_owned_object
  • env.mono_wasm_typed_array_to_array
  • env.mono_wasm_typed_array_copy_to
  • env.mono_wasm_typed_array_from
  • env.mono_wasm_typed_array_copy_from
  • env.mono_wasm_add_event_listener
  • env.mono_wasm_remove_event_listener
  • env.compile_function
  • env.abort
  • env.strftime
  • env.gettimeofday
  • env.localtime_r
  • env.time
  • env.clock_getres
  • env.clock_gettime
  • env.schedule_background_exec
  • env.mono_set_timeout
  • env.__cxa_allocate_exception
  • env.__cxa_throw
  • env.invoke_vi
  • env.__cxa_find_matching_catch_3
  • env.getTempRet0
  • env.llvm_eh_typeid_for
  • env.__cxa_begin_catch
  • env.__cxa_end_catch
  • env.__resumeException
  • env.difftime
  • env.mono_wasm_asm_loaded
  • env.mono_wasm_fire_debugger_agent_message
  • env.gai_strerror
  • env.flock
  • env.dotnet_browser_entropy
  • env.tzset
  • env.__sys_chmod
  • env.__sys_mkdir
  • env.__sys_fstatfs64
  • env.__sys_fchmod

Exports (99)

Scripts that carry or load it

  • winsnesstuga.se 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
env.__assert_failstrlen (name) < 100
env.__assert_failruntime/driver.c
env.__assert_failget_native_to_interp
env.__assert_failnum_char > 0 && num_char == str_len
env.__assert_failmono_wasm_load_runtime
env.__assert_failwasm_dl_symbol
env.__assert_faillength >= 0
env.__assert_failmono_wasm_string_from_utf16

In our sandbox

  • Produced 6 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. Showing 4 of 6.

  1. `!a!b!c!d!e!f!g!h!i!j!k!l!m!n!o!
  2. p!q!r!s!t!u!v!w!x!y!z!{!|!}!~!
  3. 0,1,2,3,4,5,6,7,8,9,:,;,<,=,>,?,@,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,[,\,],^,
  4. LC_CTYPE

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: 1 block, 8.0 KiB (1.6% of its data)
  • 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.

  • 7fa6fc38…4bee822.8 MiB · first seen 2026-10-05 · 380 functions in common (10% of this module's, 10% of that one's)
  • b3a1014c…ae72e42.8 MiB · first seen 2026-10-16 · 380 functions in common (10% of this module's, 10% of that one's)
  • 0c214988…c901d725.1 KiB · first seen 2026-10-11 · 6 functions in common (under 1% of this module's, 17% of that one's)

Seen on 1 public scan

PageTitleSeenHow it got there
winsnesstuga.seWinsnes stuga2026-10-23Built by a script at run time; Downloaded as a file