Analysis

  • user interaction
    yes
  • max time kernel
    175s
  • max time network
    173s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260709-ja
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260709-jalocale:ja-jpos:windows11-ltsc_2024-x64systemwindows
  • submitted
    03/08/2026, 09:50

General

  • Target
    PDFCore8.dll
  • Size 3.9MB
  • Sample260803-lty9asff28
  • SHA256 bc65acbf7e21d8f83af870976c0394546335d9c2fcc1bfcda59b4bfa0073b764
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • System Location Discovery: System Language Discovery 1 TTPs 2 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 23 IoCs

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

  • Modifies registry class 4 IoCs
  • Opens file in notepad (likely ransom note) 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of FindShellTrayWindow 8 IoCs
  • Suspicious use of SetWindowsHookEx 7 IoCs
  • Suspicious use of WriteProcessMemory 40 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\PDFCore8.dll,#1
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:668
    • C:\Windows\SysWOW64\rundll32.exe
      rundll32.exe C:\Users\Admin\AppData\Local\Temp\PDFCore8.dll,#1
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:3060
      • C:\Windows\SysWOW64\rundll32.exe
        "C:\Windows\SysWOW64\rundll32.exe"
        3⤵
        • System Location Discovery: System Language Discovery
        PID:4416
  • C:\Windows\System32\rundll32.exe
    C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
    1⤵
      PID:4548
    • C:\Windows\system32\OpenWith.exe
      C:\Windows\system32\OpenWith.exe -Embedding
      1⤵
      • Modifies registry class
      • Suspicious use of SetWindowsHookEx
      PID:5868
    • C:\Windows\system32\OpenWith.exe
      C:\Windows\system32\OpenWith.exe -Embedding
      1⤵
      • Modifies registry class
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:4224
      • C:\Program Files\Mozilla Firefox\firefox.exe
        "C:\Program Files\Mozilla Firefox\firefox.exe" -osint -url "C:\Users\Admin\AppData\Local\Temp\PDFCore8.dll"
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:4300
        • C:\Program Files\Mozilla Firefox\firefox.exe
          "C:\Program Files\Mozilla Firefox\firefox.exe" -osint -url C:\Users\Admin\AppData\Local\Temp\PDFCore8.dll
          3⤵
          • 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:1240
          • C:\Program Files\Mozilla Firefox\firefox.exe
            "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -parentBuildID 20250130195129 -prefsHandle 1948 -prefsLen 27098 -prefMapHandle 1952 -prefMapSize 270279 -ipcHandle 2036 -initialChannelId {4d42c2b7-00ce-4444-8057-c5265e7a3373} -parentPid 1240 -crashReporter "\\.\pipe\gecko-crash-server-pipe.1240" -appDir "C:\Program Files\Mozilla Firefox\browser" - 1 gpu
            4⤵
              PID:4404
            • C:\Program Files\Mozilla Firefox\firefox.exe
              "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -parentBuildID 20250130195129 -prefsHandle 2416 -prefsLen 27134 -prefMapHandle 2420 -prefMapSize 270279 -ipcHandle 2428 -initialChannelId {55816348-bcb4-4ccd-b4ce-78660c6425e1} -parentPid 1240 -crashReporter "\\.\pipe\gecko-crash-server-pipe.1240" -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - 2 socket
              4⤵
              • Checks processor information in registry
              PID:4716
            • C:\Program Files\Mozilla Firefox\firefox.exe
              "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -isForBrowser -prefsHandle 3952 -prefsLen 27323 -prefMapHandle 3956 -prefMapSize 270279 -jsInitHandle 3960 -jsInitLen 253512 -parentBuildID 20250130195129 -ipcHandle 3972 -initialChannelId {5654dab7-6474-4f4d-ac0a-8882e04da8ff} -parentPid 1240 -crashReporter "\\.\pipe\gecko-crash-server-pipe.1240" -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - 3 tab
              4⤵
              • Checks processor information in registry
              PID:1044
            • C:\Program Files\Mozilla Firefox\firefox.exe
              "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -parentBuildID 20250130195129 -prefsHandle 4136 -prefsLen 27323 -prefMapHandle 4140 -prefMapSize 270279 -ipcHandle 4148 -initialChannelId {a986a66c-f9da-4bb2-86b9-6b164d6e94cd} -parentPid 1240 -crashReporter "\\.\pipe\gecko-crash-server-pipe.1240" -appDir "C:\Program Files\Mozilla Firefox\browser" - 4 rdd
              4⤵
                PID:2396
              • C:\Program Files\Mozilla Firefox\firefox.exe
                "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -isForBrowser -prefsHandle 3212 -prefsLen 34822 -prefMapHandle 3060 -prefMapSize 270279 -jsInitHandle 3064 -jsInitLen 253512 -parentBuildID 20250130195129 -ipcHandle 3208 -initialChannelId {d196f2d6-58ed-4f9d-aa55-64bcd140596e} -parentPid 1240 -crashReporter "\\.\pipe\gecko-crash-server-pipe.1240" -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - 5 tab
                4⤵
                • Checks processor information in registry
                PID:5952
              • C:\Program Files\Mozilla Firefox\firefox.exe
                "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -parentBuildID 20250130195129 -sandboxingKind 0 -prefsHandle 5268 -prefsLen 35010 -prefMapHandle 5272 -prefMapSize 270279 -ipcHandle 5276 -initialChannelId {e3a3521e-5075-4146-b6f7-97926f0e8335} -parentPid 1240 -crashReporter "\\.\pipe\gecko-crash-server-pipe.1240" -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - 6 utility
                4⤵
                • Checks processor information in registry
                PID:6240
              • C:\Program Files\Mozilla Firefox\firefox.exe
                "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -isForBrowser -prefsHandle 5440 -prefsLen 32900 -prefMapHandle 5444 -prefMapSize 270279 -jsInitHandle 5448 -jsInitLen 253512 -parentBuildID 20250130195129 -ipcHandle 5464 -initialChannelId {5015a98b-204b-4321-bd65-05380af8bffd} -parentPid 1240 -crashReporter "\\.\pipe\gecko-crash-server-pipe.1240" -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - 7 tab
                4⤵
                • Checks processor information in registry
                PID:6268
              • C:\Program Files\Mozilla Firefox\firefox.exe
                "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -isForBrowser -prefsHandle 5500 -prefsLen 32952 -prefMapHandle 5504 -prefMapSize 270279 -jsInitHandle 5508 -jsInitLen 253512 -parentBuildID 20250130195129 -ipcHandle 5516 -initialChannelId {1345cf78-a6cb-427e-bfaf-c225b140034d} -parentPid 1240 -crashReporter "\\.\pipe\gecko-crash-server-pipe.1240" -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - 8 tab
                4⤵
                • Checks processor information in registry
                PID:6276
              • C:\Program Files\Mozilla Firefox\firefox.exe
                "C:\Program Files\Mozilla Firefox\firefox.exe" -contentproc -isForBrowser -prefsHandle 5860 -prefsLen 32952 -prefMapHandle 5864 -prefMapSize 270279 -jsInitHandle 5868 -jsInitLen 253512 -parentBuildID 20250130195129 -ipcHandle 5876 -initialChannelId {928a9811-b41a-4639-8e2f-24bca5cc837d} -parentPid 1240 -crashReporter "\\.\pipe\gecko-crash-server-pipe.1240" -win32kLockedDown -appDir "C:\Program Files\Mozilla Firefox\browser" - 9 tab
                4⤵
                • Checks processor information in registry
                PID:6288
        • C:\Windows\system32\OpenWith.exe
          C:\Windows\system32\OpenWith.exe -Embedding
          1⤵
          • Modifies registry class
          • Suspicious use of SetWindowsHookEx
          • Suspicious use of WriteProcessMemory
          PID:7160
          • C:\Windows\system32\NOTEPAD.EXE
            "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Local\Temp\PDFCore8.dll
            2⤵
            • Opens file in notepad (likely ransom note)
            PID:4628
        • C:\Windows\system32\cmd.exe
          "C:\Windows\system32\cmd.exe"
          1⤵
            PID:5192

          Network

                MITRE ATT&CK Enterprise v16

                Replay Monitor

                Loading Replay Monitor...

                Downloads

                data.safe.tmp

                • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\dzn6qwxz.default-release\datareporting\glean\db\data.safe.tmp
                • Size 7KB
                • SHA256 441f0dce5535f1fc575bfd0e450190360ca287b023d898731833269faa21ed69
                • MD5 SHA1 SHA512 SSDEEP TLSH

                events

                • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\dzn6qwxz.default-release\datareporting\glean\events\events
                • Size 1KB
                • SHA256 e748908acd180ff95ceef498021e9cdf88e77b41082d5270b6f41ce034031fce
                • MD5 SHA1 SHA512 TLSH

                116df5e8-73e4-4c36-b250-6ea798957349

                • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\dzn6qwxz.default-release\datareporting\glean\pending_pings\116df5e8-73e4-4c36-b250-6ea798957349
                • Size 15KB
                • SHA256 06315620b5f44ea4b6444452373361f766e2659938e2fa6e74607a9e0e0c2783
                • MD5 SHA1 SHA512 SSDEEP TLSH

                2292b744-1d97-4c81-9593-6c0314d45aba

                • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\dzn6qwxz.default-release\datareporting\glean\pending_pings\2292b744-1d97-4c81-9593-6c0314d45aba
                • Size 235B
                • SHA256 0f7a1ea1f500c05d4c1551eb310c81d82145d20726414d48b989b37107042754
                • MD5 SHA1 SHA512 TLSH

                24911505-d4e5-4838-ab44-df973e05f2c4

                • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\dzn6qwxz.default-release\datareporting\glean\pending_pings\24911505-d4e5-4838-ab44-df973e05f2c4
                • Size 883B
                • SHA256 eb0a38a7800c2f2195ed6ab57c9e6e564a571eb20017dd8ae70b3a0fbbe3d4b9
                • MD5 SHA1 SHA512 TLSH

                5a6da1ea-48d5-40a9-96db-24e6bde15a6a

                • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\dzn6qwxz.default-release\datareporting\glean\pending_pings\5a6da1ea-48d5-40a9-96db-24e6bde15a6a
                • Size 235B
                • SHA256 b87340c60f0392dbba417a97faf1279ba33e52f0875e5e101a840441192373dd
                • MD5 SHA1 SHA512 TLSH

                ad84a18b-ce7c-4b95-9e41-668531087f82

                • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\dzn6qwxz.default-release\datareporting\glean\pending_pings\ad84a18b-ce7c-4b95-9e41-668531087f82
                • Size 2KB
                • SHA256 97bf4dc6f712f64260a1da7210f16fd599bd65589ea17038113e7ba1443e41e1
                • MD5 SHA1 SHA512 TLSH

                fc36d0bc-2038-45c0-8262-353941b2c045

                • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\dzn6qwxz.default-release\datareporting\glean\pending_pings\fc36d0bc-2038-45c0-8262-353941b2c045
                • Size 886B
                • SHA256 4f42f61141d430115e95188841dbaf8ae695644c50249662781a528ec215ff20
                • MD5 SHA1 SHA512 TLSH

                prefs-1.js

                • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\dzn6qwxz.default-release\prefs-1.js
                • Size 6KB
                • SHA256 360fe0bd2d35f2e999590197666066620a9f32932e59c94d126bb5fcb3ebe085
                • MD5 SHA1 SHA512 SSDEEP TLSH

                prefs-1.js

                • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\dzn6qwxz.default-release\prefs-1.js
                • Size 6KB
                • SHA256 2dfd74cbf9942acdb6e801bd2888d60999dc63159ecdea150d3f0b1eae3b3834
                • MD5 SHA1 SHA512 SSDEEP TLSH

                prefs.js

                • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\dzn6qwxz.default-release\prefs.js
                • Size 6KB
                • SHA256 db4e1931bb157ec641fa6847d37f977aad10a01585d693a08066c7d96fdb827a
                • MD5 SHA1 SHA512 SSDEEP TLSH

                prefs.js

                • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\dzn6qwxz.default-release\prefs.js
                • Size 6KB
                • SHA256 7e9a947bc0ac634f4b8b14b9c32646fa673e890011f6845e9b5f14b88f1b33d4
                • MD5 SHA1 SHA512 SSDEEP TLSH

                sessionCheckpoints.json.tmp

                • Path C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\dzn6qwxz.default-release\sessionCheckpoints.json.tmp
                • Size 288B
                • SHA256 2fca1f29b73dd5b4159fa1eb16e69276482f5224ba7d2219a547039129a51f0e
                • MD5 SHA1 SHA512 TLSH

                PDFCore8.dll

                • Path C:\Users\Admin\Downloads\PDFCore8.dll
                • Size 3.9MB
                • SHA256 bc65acbf7e21d8f83af870976c0394546335d9c2fcc1bfcda59b4bfa0073b764
                • MD5 SHA1 SHA512 SSDEEP TLSH