Analysis

  • user interaction
    yes
  • max time kernel
    898s
  • max time network
    893s
  • platform
    windows11-21h2_x64
  • resource
    win11-20260513-en
  • resource tags

    arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-x64systemwindows
  • submitted
    28/08/2026, 18:58

General

  • Target
    avcodec-62.dll
  • Size 1.6MB
  • Sample260828-xmkccasdnc
  • SHA256 f0d91729a24dba84020badaaf7bb6f429b8283840e8f9239d0c8bb69fdc183a4
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • Drops desktop.ini file(s) 3 IoCs
  • System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Checks processor information in registry 2 TTPs 20 IoCs

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

  • Modifies registry class 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of FindShellTrayWindow 6 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 41 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:\Windows\system32\rundll32.exe
    rundll32.exe C:\Users\Admin\AppData\Local\Temp\avcodec-62.dll,#1
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2140
    • C:\Windows\SysWOW64\rundll32.exe
      rundll32.exe C:\Users\Admin\AppData\Local\Temp\avcodec-62.dll,#1
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1760
  • C:\Program Files\Mozilla Firefox\firefox.exe
    "C:\Program Files\Mozilla Firefox\firefox.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1076
    • C:\Program Files\Mozilla Firefox\firefox.exe
      "C:\Program Files\Mozilla Firefox\firefox.exe"
      2⤵
      • Drops desktop.ini file(s)
      • Checks processor information in registry
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:980
      • C:\Program Files\Mozilla Firefox\firefox.exe
        "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -parentBuildID 20250130195129 -prefsHandle 1980 -prefsLen 27097 -prefMapHandle 1984 -prefMapSize 270279 -ipcHandle 2060 -initialChannelId {686a7b97-daff-41a4-af20-0f746c221772} -parentPid 980 -crashReporter "\\.\pipe\gecko-crash-server-pipe.980" -appDir "C:\Program Files\Mozilla Firefox\browser" - 1 gpu
        3⤵
          PID:4156
        • C:\Program Files\Mozilla Firefox\firefox.exe
          "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -parentBuildID 20250130195129 -prefsHandle 2412 -prefsLen 27133 -prefMapHandle 2416 -prefMapSize 270279 -ipcHandle 2436 -initialChannelId {3948e641-7c7d-43f3-a2f9-bbfe28a15550} -parentPid 980 -crashReporter "\\.\pipe\gecko-crash-server-pipe.980" -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - 2 socket
          3⤵
            PID:1052
          • C:\Program Files\Mozilla Firefox\firefox.exe
            "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -isForBrowser -prefsHandle 3652 -prefsLen 27274 -prefMapHandle 3656 -prefMapSize 270279 -jsInitHandle 3660 -jsInitLen 253512 -parentBuildID 20250130195129 -ipcHandle 3668 -initialChannelId {cdb13df9-f3df-4a10-86e4-d87d38854991} -parentPid 980 -crashReporter "\\.\pipe\gecko-crash-server-pipe.980" -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - 3 tab
            3⤵
            • Checks processor information in registry
            PID:2636
          • C:\Program Files\Mozilla Firefox\firefox.exe
            "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -parentBuildID 20250130195129 -prefsHandle 3844 -prefsLen 27274 -prefMapHandle 3848 -prefMapSize 270279 -ipcHandle 3796 -initialChannelId {334aaee5-876d-488d-8028-db54b164277e} -parentPid 980 -crashReporter "\\.\pipe\gecko-crash-server-pipe.980" -appDir "C:\Program Files\Mozilla Firefox\browser" - 4 rdd
            3⤵
              PID:4252
            • C:\Program Files\Mozilla Firefox\firefox.exe
              "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -isForBrowser -prefsHandle 3184 -prefsLen 34773 -prefMapHandle 1416 -prefMapSize 270279 -jsInitHandle 2728 -jsInitLen 253512 -parentBuildID 20250130195129 -ipcHandle 2656 -initialChannelId {c319c251-1090-4288-b2a2-8443645fbeb5} -parentPid 980 -crashReporter "\\.\pipe\gecko-crash-server-pipe.980" -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - 5 tab
              3⤵
              • Checks processor information in registry
              PID:1340
            • C:\Program Files\Mozilla Firefox\firefox.exe
              "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -parentBuildID 20250130195129 -sandboxingKind 0 -prefsHandle 4832 -prefsLen 35010 -prefMapHandle 4704 -prefMapSize 270279 -ipcHandle 4632 -initialChannelId {6578ff45-abad-444a-9c26-044ea3c3bf41} -parentPid 980 -crashReporter "\\.\pipe\gecko-crash-server-pipe.980" -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - 6 utility
              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 5032 -prefsLen 32900 -prefMapHandle 5036 -prefMapSize 270279 -jsInitHandle 5040 -jsInitLen 253512 -parentBuildID 20250130195129 -ipcHandle 5048 -initialChannelId {94b1a392-1d79-4247-80d7-af0153493f12} -parentPid 980 -crashReporter "\\.\pipe\gecko-crash-server-pipe.980" -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - 7 tab
              3⤵
              • Checks processor information in registry
              PID:2388
            • C:\Program Files\Mozilla Firefox\firefox.exe
              "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -isForBrowser -prefsHandle 5288 -prefsLen 32952 -prefMapHandle 5284 -prefMapSize 270279 -jsInitHandle 5280 -jsInitLen 253512 -parentBuildID 20250130195129 -ipcHandle 5272 -initialChannelId {1e62b31f-51de-46bc-aaf6-4fb3dc2f747d} -parentPid 980 -crashReporter "\\.\pipe\gecko-crash-server-pipe.980" -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - 8 tab
              3⤵
              • Checks processor information in registry
              PID:1436
            • C:\Program Files\Mozilla Firefox\firefox.exe
              "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -isForBrowser -prefsHandle 5440 -prefsLen 32952 -prefMapHandle 5444 -prefMapSize 270279 -jsInitHandle 5448 -jsInitLen 253512 -parentBuildID 20250130195129 -ipcHandle 5456 -initialChannelId {615b4d9f-5bba-4135-8975-d2c209a57d63} -parentPid 980 -crashReporter "\\.\pipe\gecko-crash-server-pipe.980" -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - 9 tab
              3⤵
              • Checks processor information in registry
              PID:4616
            • C:\Program Files\Mozilla Firefox\firefox.exe
              "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -isForBrowser -prefsHandle 6324 -prefsLen 37270 -prefMapHandle 6548 -prefMapSize 270279 -jsInitHandle 6576 -jsInitLen 253512 -parentBuildID 20250130195129 -ipcHandle 6648 -initialChannelId {86e1c9e0-31b2-44f3-aed5-dc6f372543a4} -parentPid 980 -crashReporter "\\.\pipe\gecko-crash-server-pipe.980" -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - 10 tab
              3⤵
              • Checks processor information in registry
              PID:4296
        • C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\MiniSearchHost.exe
          "C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\MiniSearchHost.exe" -ServerName:MiniSearchUI.AppXj3y73at8fy1htwztzxs68sxx1v7cksp7.mca
          1⤵
          • Modifies registry class
          • Suspicious use of SetWindowsHookEx
          PID:2692

        Network

              MITRE ATT&CK Enterprise v16

              Replay Monitor

              Loading Replay Monitor...

              Downloads

              5E43012191E7B1F510ACD5BF039D8BF1B9A277B2

              • Path C:\Users\Admin\AppData\Local\Mozilla\Firefox\Profiles\9tz20xb5.default-release\cache2\entries\5E43012191E7B1F510ACD5BF039D8BF1B9A277B2
              • Size 16KB
              • SHA256 ab175349676889eb18d0906888f8e4a3fbe03ac3c170e13052e9bb0987d33f08
              • MD5 SHA1 SHA512 SSDEEP TLSH

              6DED9FE7A50E8290358DC1D8C755B05692CB9E36

              • Path C:\Users\Admin\AppData\Local\Mozilla\Firefox\Profiles\9tz20xb5.default-release\cache2\entries\6DED9FE7A50E8290358DC1D8C755B05692CB9E36
              • Size 512KB
              • SHA256 e592c4e2dfffd295f57a4a27bb2d4f5cf5c37459f296c2b06f40139d01350a23
              • MD5 SHA1 SHA512 SSDEEP TLSH

              86DDBDE5E1EAFC4C588EE71FB531985C95CCC542

              • Path C:\Users\Admin\AppData\Local\Mozilla\Firefox\Profiles\9tz20xb5.default-release\cache2\entries\86DDBDE5E1EAFC4C588EE71FB531985C95CCC542
              • Size 16KB
              • SHA256 4ab594dd0bb13d462e8fd298f9983210ba30ceda9cbc832228774eae34322243
              • MD5 SHA1 SHA512 SSDEEP TLSH

              SearchHoverUnifiedTileModelCache.dat

              • Path C:\Users\Admin\AppData\Local\Packages\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\TempState\SearchHoverUnifiedTileModelCache.dat
              • Size 21KB
              • SHA256 af324cd946cec1bf4fffd89728db43f4409393fbb466a3beb7c6b357e1a7c032
              • MD5 SHA1 SHA512 SSDEEP TLSH

              SearchHoverUnifiedTileModelCache.dat

              • Path C:\Users\Admin\AppData\Local\Packages\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\TempState\SearchHoverUnifiedTileModelCache.dat
              • Size 21KB
              • SHA256 8aa20b4b85352dac91eb6e840dca70a9e1f4032967da8cbde10a37442e3253a4
              • MD5 SHA1 SHA512 SSDEEP TLSH

              tmpaddon

              • Path C:\Users\Admin\AppData\Local\Temp\tmpaddon
              • Size 11KB
              • SHA256 ddf3ba4e25a622276755133e0cce5605b83719c7cab3546e09acbfed00d6a986
              • MD5 SHA1 SHA512 SSDEEP TLSH

              tmpaddon

              • Path C:\Users\Admin\AppData\Local\Temp\tmpaddon
              • Size 21.6MB
              • SHA256 7b81444b063f81e77c527c5589e86836cc2f7328deb2772300ccc7dc9e2510c3
              • MD5 SHA1 SHA512 SSDEEP TLSH

              data.safe.tmp

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\9tz20xb5.default-release\datareporting\glean\db\data.safe.tmp
              • Size 6KB
              • SHA256 494090b1b1975dea1d0e78edd0b9cdbdbc536475179982bb4bfd07894d1f3cf1
              • MD5 SHA1 SHA512 SSDEEP TLSH

              data.safe.tmp

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\9tz20xb5.default-release\datareporting\glean\db\data.safe.tmp
              • Size 7KB
              • SHA256 d353fe5c84952de11ab63bbd34d56070471ab9aef1298ec674e35780cb204145
              • MD5 SHA1 SHA512 SSDEEP TLSH

              events

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\9tz20xb5.default-release\datareporting\glean\events\events
              • Size 1KB
              • SHA256 1a270ca737ec0067ec0057a0e6f788758976bfb06685172df82fd8c6b869146c
              • MD5 SHA1 SHA512 TLSH

              1a1c46ef-3f5e-44aa-8081-bfe43dfbb44c

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\9tz20xb5.default-release\datareporting\glean\pending_pings\1a1c46ef-3f5e-44aa-8081-bfe43dfbb44c
              • Size 235B
              • SHA256 dce533835ecbc89b8e9ec6defa1f61e7f3627831b4943ec32d02bf89cfb539dd
              • MD5 SHA1 SHA512 TLSH

              2ae4e89a-5ca0-4e49-bd51-1a6560b56e53

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\9tz20xb5.default-release\datareporting\glean\pending_pings\2ae4e89a-5ca0-4e49-bd51-1a6560b56e53
              • Size 235B
              • SHA256 debebc4db25f904ef290ac14f0e89ede04f07ffef36c03e68e4929fe9425507d
              • MD5 SHA1 SHA512 TLSH

              600f43a8-fe79-463d-bffa-7efda7f1d2ac

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\9tz20xb5.default-release\datareporting\glean\pending_pings\600f43a8-fe79-463d-bffa-7efda7f1d2ac
              • Size 2KB
              • SHA256 f25f9be052b9d9f2cd8e8858a09843f376900160b06e0ee5f8997593e064a381
              • MD5 SHA1 SHA512 TLSH

              77851419-b0b8-4cb8-ad4f-dfe34ce4f268

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\9tz20xb5.default-release\datareporting\glean\pending_pings\77851419-b0b8-4cb8-ad4f-dfe34ce4f268
              • Size 883B
              • SHA256 15feaf985dc7f5b3f567b38e41e247a62aaa07070756de664b9ef3357754df33
              • MD5 SHA1 SHA512 TLSH

              7cd68b01-a175-4922-99c0-20415faab17b

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\9tz20xb5.default-release\datareporting\glean\pending_pings\7cd68b01-a175-4922-99c0-20415faab17b
              • Size 886B
              • SHA256 4c2972f2c8bbfd2b7af4efade176e3b00805f20c5bc4d7b3cf464cb87d5c1097
              • MD5 SHA1 SHA512 TLSH

              db67562f-8025-4121-95dc-148577307018

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\9tz20xb5.default-release\datareporting\glean\pending_pings\db67562f-8025-4121-95dc-148577307018
              • Size 16KB
              • SHA256 3dd2dddf35a6c9f1f0b6f993e3650990825bebbe53831755e9f5fd3440c2533a
              • MD5 SHA1 SHA512 SSDEEP TLSH

              extensions.json

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\9tz20xb5.default-release\extensions.json
              • Size 16KB
              • SHA256 1466a6666464524beadd1f0739747afc48d8930cc9b59ece53a1f4bed292535a
              • MD5 SHA1 SHA512 SSDEEP TLSH

              gmpopenh264.dll

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\9tz20xb5.default-release\gmp-gmpopenh264\2.6.0\gmpopenh264.dll
              • Size 1.1MB
              • SHA256 37c005a7789747b412d6c0a6a4c30d15732da3d857b4f94b744be1a67231b651
              • MD5 SHA1 SHA512 SSDEEP TLSH

              gmpopenh264.info

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\9tz20xb5.default-release\gmp-gmpopenh264\2.6.0\gmpopenh264.info
              • Size 116B
              • SHA256 fe7686a6281f0ab519c32c788ce0da0d01640425018dcffcfcb81105757f6fe6
              • MD5 SHA1 SHA512 TLSH

              LICENSE.tmp

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\9tz20xb5.default-release\gmp-widevinecdm\4.10.3050.0\LICENSE.tmp
              • Size 473B
              • SHA256 20de375707692099b3132084695377ce5fec0aec05813dedcce094b8eda44386
              • MD5 SHA1 SHA512 TLSH

              manifest.json

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\9tz20xb5.default-release\gmp-widevinecdm\4.10.3050.0\manifest.json
              • Size 1002B
              • SHA256 2894996540fabbd346ed4ced8386ca77d6badf60372e307ee15c906c30340d0d
              • MD5 SHA1 SHA512 TLSH

              widevinecdm.dll

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\9tz20xb5.default-release\gmp-widevinecdm\4.10.3050.0\widevinecdm.dll
              • Size 21.6MB
              • SHA256 f1216e26ee8c27f938d7722427d29f190e569ed83d0ba16ea872cae684b97602
              • MD5 SHA1 SHA512 SSDEEP TLSH

              prefs-1.js

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\9tz20xb5.default-release\prefs-1.js
              • Size 8KB
              • SHA256 407c51100a178ccc7bb3aa1b8b09280b0ce5a177d4e16b8980338aa8e7104d7d
              • MD5 SHA1 SHA512 SSDEEP TLSH

              prefs.js

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\9tz20xb5.default-release\prefs.js
              • Size 6KB
              • SHA256 4b8a934339cb4c970e10b1c998011d665e149cea1a587ba2502a3f329966fa8b
              • MD5 SHA1 SHA512 SSDEEP TLSH

              prefs.js

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\9tz20xb5.default-release\prefs.js
              • Size 7KB
              • SHA256 d68181b8f9e23a0b5638ee85dd30c230487e14860e5f2dd0288982d93debfef1
              • MD5 SHA1 SHA512 SSDEEP TLSH

              prefs.js

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\9tz20xb5.default-release\prefs.js
              • Size 6KB
              • SHA256 4f86771a0736b84a96dcc15cff7af56664879d9c00b07bc2dc4fc372f5c31765
              • MD5 SHA1 SHA512 SSDEEP TLSH

              recovery.jsonlz4

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\9tz20xb5.default-release\sessionstore-backups\recovery.jsonlz4
              • Size 1KB
              • SHA256 1a91ea04409d1c2561bd430b0c8c29f95c1090a4af85f3c884240831c068afdf
              • MD5 SHA1 SHA512 TLSH

              3870112724rsegmnoittet-es.sqlite

              • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\9tz20xb5.default-release\storage\permanent\chrome\idb\3870112724rsegmnoittet-es.sqlite
              • Size 4.1MB
              • SHA256 78654e725d36122c0daea1cecb7db97a87d14643a4305b9bb81ea821a8331126
              • MD5 SHA1 SHA512 SSDEEP TLSH