Analysis

  • user interaction
    yes
  • max time kernel
    148s
  • max time network
    125s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260513-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    02/08/2026, 23:11

General

  • Target
    https://github.com/Seralyth/Seralyth-Menu/releases/latest/download/Seralyth-Menu.dll
  • Sample260802-26d2wsyvbx
Score
6/10

Malware Config

Signatures

  • Drops desktop.ini file(s) 3 IoCs
  • Checks processor information in registry 2 TTPs 18 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Modifies registry class 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of FindShellTrayWindow 7 IoCs
  • Suspicious use of SetWindowsHookEx 10 IoCs
  • Suspicious use of WriteProcessMemory 36 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Program Files\Mozilla Firefox\firefox.exe
    "C:\Program Files\Mozilla Firefox\firefox.exe" -osint -url "https://github.com/Seralyth/Seralyth-Menu/releases/latest/download/Seralyth-Menu.dll"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:4336
    • C:\Program Files\Mozilla Firefox\firefox.exe
      "C:\Program Files\Mozilla Firefox\firefox.exe" -osint -url https://github.com/Seralyth/Seralyth-Menu/releases/latest/download/Seralyth-Menu.dll
      2⤵
      • Drops desktop.ini file(s)
      • Checks processor information in registry
      • Modifies registry class
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:5088
      • C:\Program Files\Mozilla Firefox\firefox.exe
        "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -parentBuildID 20250130195129 -prefsHandle 2040 -prefsLen 27099 -prefMapHandle 2044 -prefMapSize 270279 -ipcHandle 2100 -initialChannelId {f06a3a81-3796-449e-9578-b82f3fc6b571} -parentPid 5088 -crashReporter "\\.\pipe\gecko-crash-server-pipe.5088" -appDir "C:\Program Files\Mozilla Firefox\browser" - 1 gpu
        3⤵
          PID:2588
        • C:\Program Files\Mozilla Firefox\firefox.exe
          "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -parentBuildID 20250130195129 -prefsHandle 2484 -prefsLen 27135 -prefMapHandle 2488 -prefMapSize 270279 -ipcHandle 2508 -initialChannelId {58d8fb40-4db3-477f-aaeb-0d390cd1d549} -parentPid 5088 -crashReporter "\\.\pipe\gecko-crash-server-pipe.5088" -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - 2 socket
          3⤵
            PID:4420
          • C:\Program Files\Mozilla Firefox\firefox.exe
            "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -isForBrowser -prefsHandle 3764 -prefsLen 25164 -prefMapHandle 3768 -prefMapSize 270279 -jsInitHandle 3772 -jsInitLen 253512 -parentBuildID 20250130195129 -ipcHandle 3780 -initialChannelId {9837920a-1991-4b90-8a9a-6c481a91cf7e} -parentPid 5088 -crashReporter "\\.\pipe\gecko-crash-server-pipe.5088" -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - 3 tab
            3⤵
            • Checks processor information in registry
            PID:2140
          • C:\Program Files\Mozilla Firefox\firefox.exe
            "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -parentBuildID 20250130195129 -prefsHandle 3952 -prefsLen 27276 -prefMapHandle 3956 -prefMapSize 270279 -ipcHandle 3908 -initialChannelId {9f71f657-ff66-419c-9d65-282a4496557a} -parentPid 5088 -crashReporter "\\.\pipe\gecko-crash-server-pipe.5088" -appDir "C:\Program Files\Mozilla Firefox\browser" - 4 rdd
            3⤵
              PID:1524
            • C:\Program Files\Mozilla Firefox\firefox.exe
              "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -isForBrowser -prefsHandle 4372 -prefsLen 34775 -prefMapHandle 4376 -prefMapSize 270279 -jsInitHandle 4380 -jsInitLen 253512 -parentBuildID 20250130195129 -ipcHandle 4344 -initialChannelId {c1c49469-f4d7-4d1a-8e21-9adb3a32a737} -parentPid 5088 -crashReporter "\\.\pipe\gecko-crash-server-pipe.5088" -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - 5 tab
              3⤵
              • Checks processor information in registry
              PID:4328
            • C:\Program Files\Mozilla Firefox\firefox.exe
              "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -parentBuildID 20250130195129 -sandboxingKind 0 -prefsHandle 2820 -prefsLen 34905 -prefMapHandle 4964 -prefMapSize 270279 -ipcHandle 4956 -initialChannelId {9feb4319-b9a3-44f1-94bb-914af3898ac4} -parentPid 5088 -crashReporter "\\.\pipe\gecko-crash-server-pipe.5088" -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - 6 utility
              3⤵
              • Checks processor information in registry
              PID:3352
            • C:\Program Files\Mozilla Firefox\firefox.exe
              "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -isForBrowser -prefsHandle 5100 -prefsLen 32845 -prefMapHandle 5104 -prefMapSize 270279 -jsInitHandle 5108 -jsInitLen 253512 -parentBuildID 20250130195129 -ipcHandle 5116 -initialChannelId {5189761f-3f1c-4005-a7c5-941325b7f40b} -parentPid 5088 -crashReporter "\\.\pipe\gecko-crash-server-pipe.5088" -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - 7 tab
              3⤵
              • Checks processor information in registry
              PID:4048
            • C:\Program Files\Mozilla Firefox\firefox.exe
              "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -isForBrowser -prefsHandle 5144 -prefsLen 32845 -prefMapHandle 5148 -prefMapSize 270279 -jsInitHandle 5152 -jsInitLen 253512 -parentBuildID 20250130195129 -ipcHandle 5160 -initialChannelId {e35bde26-7112-49e2-9cb2-eb4f60065f10} -parentPid 5088 -crashReporter "\\.\pipe\gecko-crash-server-pipe.5088" -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - 8 tab
              3⤵
              • Checks processor information in registry
              PID:4580
            • C:\Program Files\Mozilla Firefox\firefox.exe
              "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -isForBrowser -prefsHandle 5516 -prefsLen 32845 -prefMapHandle 5520 -prefMapSize 270279 -jsInitHandle 5524 -jsInitLen 253512 -parentBuildID 20250130195129 -ipcHandle 5528 -initialChannelId {43f8d40a-97b9-4b5d-907c-96f5431006d6} -parentPid 5088 -crashReporter "\\.\pipe\gecko-crash-server-pipe.5088" -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - 9 tab
              3⤵
              • Checks processor information in registry
              PID:2888

        Network

              MITRE ATT&CK Enterprise v16

              Replay Monitor

              Loading Replay Monitor...

              Downloads

              activity-stream.discovery_stream.json.tmp

              • Path C:\Users\Admin\AppData\Local\Mozilla\Firefox\Profiles\2d5mkwou.default-release\activity-stream.discovery_stream.json.tmp
              • Size 75KB
              • SHA256 c6be71443e975e2037bd07c7325bc629858ea7d3d7b7db9cd38fb48f602a144b
              • MD5 SHA1 SHA512 SSDEEP TLSH

              data.safe.tmp

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\2d5mkwou.default-release\datareporting\glean\db\data.safe.tmp
              • Size 3KB
              • SHA256 9aab93d835f678d50e90c9508dba8b75dc6cf807d9d8aec144f8040dc81f5c30
              • MD5 SHA1 SHA512 TLSH

              data.safe.tmp

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\2d5mkwou.default-release\datareporting\glean\db\data.safe.tmp
              • Size 6KB
              • SHA256 dfea2c4d274d9bb82906bd808ca73451d4b98b38660b34d6dbdcb5b094792485
              • MD5 SHA1 SHA512 SSDEEP TLSH

              events

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\2d5mkwou.default-release\datareporting\glean\events\events
              • Size 1KB
              • SHA256 998dee4a2c114ffadac7626e074ef00ca1e65c5091586d7c5ac21b9219490acb
              • MD5 SHA1 SHA512 TLSH

              3216738e-b1ef-4fa1-8a31-26b63c3837d4

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\2d5mkwou.default-release\datareporting\glean\pending_pings\3216738e-b1ef-4fa1-8a31-26b63c3837d4
              • Size 883B
              • SHA256 5c9fcd4f3065e3c6b30957288b0f1365ce2c1643a5af9d69eb449e98182a7bec
              • MD5 SHA1 SHA512 TLSH

              6232d8a4-4848-4d31-af63-ade6e93f51dd

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\2d5mkwou.default-release\datareporting\glean\pending_pings\6232d8a4-4848-4d31-af63-ade6e93f51dd
              • Size 235B
              • SHA256 9b5f58d7285cd07aa6db003c33a45ff8aa2db3cc2742667d72bbfea5e17db963
              • MD5 SHA1 SHA512 TLSH

              8e5a46b5-8f72-42c9-9ce5-23fed9cdc700

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\2d5mkwou.default-release\datareporting\glean\pending_pings\8e5a46b5-8f72-42c9-9ce5-23fed9cdc700
              • Size 15KB
              • SHA256 91718d9b78ddc3b8cceb4399694ed9426ca7ed178886f377d630456985e1b002
              • MD5 SHA1 SHA512 SSDEEP TLSH

              b1cd556d-8be8-4ef9-b061-1e3884072c4d

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\2d5mkwou.default-release\datareporting\glean\pending_pings\b1cd556d-8be8-4ef9-b061-1e3884072c4d
              • Size 886B
              • SHA256 173bea48a25f128587d6e91516d7946dd69a3ad93d590b8cef8ec7bca7203d3d
              • MD5 SHA1 SHA512 TLSH

              d3b398d3-b3e8-4fef-bf59-717699741fdb

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\2d5mkwou.default-release\datareporting\glean\pending_pings\d3b398d3-b3e8-4fef-bf59-717699741fdb
              • Size 2KB
              • SHA256 2bae26817c12d4abe936a7f3beec0ac6a864e1e5c4c25f7101483284e6f56d88
              • MD5 SHA1 SHA512 TLSH

              f9345bf4-0320-40e1-af66-08ae86bb981c

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\2d5mkwou.default-release\datareporting\glean\pending_pings\f9345bf4-0320-40e1-af66-08ae86bb981c
              • Size 235B
              • SHA256 6cb922f0d55c14e2fe5051c29e38de852bde3c93537a47dcc0126de8fa6a3186
              • MD5 SHA1 SHA512 TLSH

              prefs-1.js

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\2d5mkwou.default-release\prefs-1.js
              • Size 7KB
              • SHA256 42915769197921d167a57afaae597f3886707130747da54ed9946a62d02996d2
              • MD5 SHA1 SHA512 SSDEEP TLSH

              prefs-1.js

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\2d5mkwou.default-release\prefs-1.js
              • Size 6KB
              • SHA256 874bdeec0a29f03c960a5bb10d7762fca546b33be6c5d1371a8ef729a510371a
              • MD5 SHA1 SHA512 SSDEEP TLSH

              prefs.js

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\2d5mkwou.default-release\prefs.js
              • Size 6KB
              • SHA256 ef86b6baed72706aa11783dfe0fd66f1e84e038b759c5f36b7fc573372fdcc41
              • MD5 SHA1 SHA512 SSDEEP TLSH

              prefs.js

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\2d5mkwou.default-release\prefs.js
              • Size 6KB
              • SHA256 b524968118e28ffee245123834d70d27c796468123a250ff3c95ce99fc50ec30
              • MD5 SHA1 SHA512 SSDEEP TLSH

              recovery.baklz4

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\2d5mkwou.default-release\sessionstore-backups\recovery.baklz4
              • Size 1KB
              • SHA256 ba2bf6d36f16cadc3604bc2947aff733db97ef6646e7b057fa8e5648b3e074d5
              • MD5 SHA1 SHA512 TLSH

              recovery.jsonlz4

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\2d5mkwou.default-release\sessionstore-backups\recovery.jsonlz4
              • Size 1KB
              • SHA256 eb2c001da41eba79b21351f8d8066ae2c4fbe669f0792d1449914f8ca24e1bd8
              • MD5 SHA1 SHA512 TLSH