Analysis

  • max time kernel
    150s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20250211-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20250211-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-02-2025 15:16

General

  • Target

    prflbmsg.dll

  • Size

    13KB

  • MD5

    54fb96ffb3e2984755f82cfff72e317a

  • SHA1

    e569e22624267b38abfe33a452a1f7657848ea13

  • SHA256

    73b88e1238ab71ed4142952f06e49d230f611c28ceeac263820f6af148d2965b

  • SHA512

    105e5353ea3db3c90e5d2a7ad0ee0dea52d648e61c0a34a2ee507a3393ec3c925d15e96eab59cd186ecd2d9322211de886058db88ccd8b6ea706884d0eb632d3

  • SSDEEP

    192:sW3KWeyBV+b/Es/yppToazeoeWKCS3v4b//kbIFx7/j:sW3KWNiURBajQb3kbSj

Malware Config

Signatures

  • Boot or Logon Autostart Execution: Active Setup 2 TTPs 7 IoCs

    Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

  • Downloads MZ/PE file 1 IoCs
  • Event Triggered Execution: Component Object Model Hijacking 1 TTPs

    Adversaries may establish persistence by executing malicious content triggered by hijacked references to Component Object Model (COM) objects.

  • Executes dropped EXE 10 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Installs/modifies Browser Helper Object 2 TTPs 8 IoCs

    BHOs are DLL modules which act as plugins for Internet Explorer.

  • Drops file in System32 directory 1 IoCs
  • Drops file in Program Files directory 64 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • 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.

  • System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

    Adversaries may check for Internet connectivity on compromised systems.

  • Modifies Internet Explorer settings 1 TTPs 26 IoCs
  • Modifies data under HKEY_USERS 2 IoCs
  • Modifies registry class 64 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 20 IoCs
  • System policy modification 1 TTPs 4 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\prflbmsg.dll,#1
    1⤵
      PID:1712
    • C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe
      "C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe" /ping 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-PGFwcCBhcHBpZD0iezhBNjlEMzQ1LUQ1NjQtNDYzYy1BRkYxLUE2OUQ5RTUzMEY5Nn0iIHZlcnNpb249IjEyMy4wLjYzMTIuMTIzIiBuZXh0dmVyc2lvbj0iIiBsYW5nPSJlbiIgYnJhbmQ9IkdHTFMiIGNsaWVudD0iIiBpbnN0YWxsYWdlPSI2IiBpbnN0YWxsZGF0ZXRpbWU9IjE3MzkyODIxNjkiIG9vYmVfaW5zdGFsbF90aW1lPSIxMzM4Mzc1MzE4NTEwMTAwMDAiPjxldmVudCBldmVudHR5cGU9IjMxIiBldmVudHJlc3VsdD0iMSIgZXJyb3Jjb2RlPSIwIiBleHRyYWNvZGUxPSIyMTc5ODYyIiBzeXN0ZW1fdXB0aW1lX3RpY2tzPSI1MzI0MjQ4MTI3Ii8-PC9hcHA-PC9yZXF1ZXN0Pg
      1⤵
      • System Location Discovery: System Language Discovery
      • System Network Configuration Discovery: Internet Connection Discovery
      PID:3164
    • C:\Program Files (x86)\Microsoft\EdgeUpdate\Install\{778F1860-BE00-49C3-B676-D96854178075}\MicrosoftEdge_X64_133.0.3065.69.exe
      "C:\Program Files (x86)\Microsoft\EdgeUpdate\Install\{778F1860-BE00-49C3-B676-D96854178075}\MicrosoftEdge_X64_133.0.3065.69.exe" --msedge --verbose-logging --do-not-launch-msedge --system-level --channel=stable
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:1588
      • C:\Program Files (x86)\Microsoft\EdgeUpdate\Install\{778F1860-BE00-49C3-B676-D96854178075}\EDGEMITMP_3A54A.tmp\setup.exe
        "C:\Program Files (x86)\Microsoft\EdgeUpdate\Install\{778F1860-BE00-49C3-B676-D96854178075}\EDGEMITMP_3A54A.tmp\setup.exe" --install-archive="C:\Program Files (x86)\Microsoft\EdgeUpdate\Install\{778F1860-BE00-49C3-B676-D96854178075}\MicrosoftEdge_X64_133.0.3065.69.exe" --msedge --verbose-logging --do-not-launch-msedge --system-level --channel=stable
        2⤵
        • Boot or Logon Autostart Execution: Active Setup
        • Executes dropped EXE
        • Installs/modifies Browser Helper Object
        • Drops file in Program Files directory
        • Modifies Internet Explorer settings
        • Modifies registry class
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        • System policy modification
        PID:1208
        • C:\Program Files (x86)\Microsoft\EdgeUpdate\Install\{778F1860-BE00-49C3-B676-D96854178075}\EDGEMITMP_3A54A.tmp\setup.exe
          "C:\Program Files (x86)\Microsoft\EdgeUpdate\Install\{778F1860-BE00-49C3-B676-D96854178075}\EDGEMITMP_3A54A.tmp\setup.exe" --type=crashpad-handler /prefetch:4 --monitor-self-annotation=ptype=crashpad-handler "--database=C:\Program Files\MsEdgeCrashpad" --annotation=IsOfficialBuild=1 --annotation=channel= --annotation=chromium-version=133.0.6943.99 "--annotation=exe=C:\Program Files (x86)\Microsoft\EdgeUpdate\Install\{778F1860-BE00-49C3-B676-D96854178075}\EDGEMITMP_3A54A.tmp\setup.exe" --annotation=plat=Win64 --annotation=prod=Edge --annotation=ver=133.0.3065.69 --initial-client-data=0x230,0x234,0x238,0x20c,0x23c,0x7ff7c8bb6a68,0x7ff7c8bb6a74,0x7ff7c8bb6a80
          3⤵
          • Executes dropped EXE
          PID:1452
        • C:\Program Files (x86)\Microsoft\EdgeUpdate\Install\{778F1860-BE00-49C3-B676-D96854178075}\EDGEMITMP_3A54A.tmp\setup.exe
          "C:\Program Files (x86)\Microsoft\EdgeUpdate\Install\{778F1860-BE00-49C3-B676-D96854178075}\EDGEMITMP_3A54A.tmp\setup.exe" --msedge --channel=stable --system-level --verbose-logging --create-shortcuts=2 --install-level=1
          3⤵
          • Executes dropped EXE
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:2356
          • C:\Program Files (x86)\Microsoft\EdgeUpdate\Install\{778F1860-BE00-49C3-B676-D96854178075}\EDGEMITMP_3A54A.tmp\setup.exe
            "C:\Program Files (x86)\Microsoft\EdgeUpdate\Install\{778F1860-BE00-49C3-B676-D96854178075}\EDGEMITMP_3A54A.tmp\setup.exe" --type=crashpad-handler /prefetch:4 --monitor-self-annotation=ptype=crashpad-handler "--database=C:\Program Files\MsEdgeCrashpad" --annotation=IsOfficialBuild=1 --annotation=channel= --annotation=chromium-version=133.0.6943.99 "--annotation=exe=C:\Program Files (x86)\Microsoft\EdgeUpdate\Install\{778F1860-BE00-49C3-B676-D96854178075}\EDGEMITMP_3A54A.tmp\setup.exe" --annotation=plat=Win64 --annotation=prod=Edge --annotation=ver=133.0.3065.69 --initial-client-data=0x224,0x228,0x22c,0x200,0x230,0x7ff7c8bb6a68,0x7ff7c8bb6a74,0x7ff7c8bb6a80
            4⤵
            • Executes dropped EXE
            • Drops file in Program Files directory
            PID:3444
        • C:\Program Files (x86)\Microsoft\Edge\Application\133.0.3065.69\Installer\setup.exe
          "C:\Program Files (x86)\Microsoft\Edge\Application\133.0.3065.69\Installer\setup.exe" --msedge --channel=stable --register-package-identity --verbose-logging --system-level
          3⤵
          • Executes dropped EXE
          • Drops file in Program Files directory
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:4688
          • C:\Program Files (x86)\Microsoft\Edge\Application\133.0.3065.69\Installer\setup.exe
            "C:\Program Files (x86)\Microsoft\Edge\Application\133.0.3065.69\Installer\setup.exe" --type=crashpad-handler /prefetch:4 --monitor-self-annotation=ptype=crashpad-handler "--database=C:\Program Files\MsEdgeCrashpad" --annotation=IsOfficialBuild=1 --annotation=channel= --annotation=chromium-version=133.0.6943.99 "--annotation=exe=C:\Program Files (x86)\Microsoft\Edge\Application\133.0.3065.69\Installer\setup.exe" --annotation=plat=Win64 --annotation=prod=Edge --annotation=ver=133.0.3065.69 --initial-client-data=0x224,0x228,0x22c,0x200,0x230,0x7ff6bd406a68,0x7ff6bd406a74,0x7ff6bd406a80
            4⤵
            • Executes dropped EXE
            PID:3568
        • C:\Program Files (x86)\Microsoft\Edge\Application\133.0.3065.69\Installer\setup.exe
          "C:\Program Files (x86)\Microsoft\Edge\Application\133.0.3065.69\Installer\setup.exe" --msedge --channel=stable --remove-deprecated-packages --verbose-logging --system-level
          3⤵
          • Executes dropped EXE
          • Drops file in Program Files directory
          • Suspicious use of WriteProcessMemory
          PID:4876
          • C:\Program Files (x86)\Microsoft\Edge\Application\133.0.3065.69\Installer\setup.exe
            "C:\Program Files (x86)\Microsoft\Edge\Application\133.0.3065.69\Installer\setup.exe" --type=crashpad-handler /prefetch:4 --monitor-self-annotation=ptype=crashpad-handler "--database=C:\Program Files\MsEdgeCrashpad" --annotation=IsOfficialBuild=1 --annotation=channel= --annotation=chromium-version=133.0.6943.99 "--annotation=exe=C:\Program Files (x86)\Microsoft\Edge\Application\133.0.3065.69\Installer\setup.exe" --annotation=plat=Win64 --annotation=prod=Edge --annotation=ver=133.0.3065.69 --initial-client-data=0x224,0x228,0x22c,0x200,0x230,0x7ff6bd406a68,0x7ff6bd406a74,0x7ff6bd406a80
            4⤵
            • Executes dropped EXE
            PID:4072
        • C:\Program Files (x86)\Microsoft\Edge\Application\133.0.3065.69\Installer\setup.exe
          "C:\Program Files (x86)\Microsoft\Edge\Application\133.0.3065.69\Installer\setup.exe" --msedge --channel=stable --update-game-assist-package --verbose-logging --system-level
          3⤵
          • Executes dropped EXE
          • Suspicious use of WriteProcessMemory
          PID:1832
          • C:\Program Files (x86)\Microsoft\Edge\Application\133.0.3065.69\Installer\setup.exe
            "C:\Program Files (x86)\Microsoft\Edge\Application\133.0.3065.69\Installer\setup.exe" --type=crashpad-handler /prefetch:4 --monitor-self-annotation=ptype=crashpad-handler "--database=C:\Program Files\MsEdgeCrashpad" --annotation=IsOfficialBuild=1 --annotation=channel= --annotation=chromium-version=133.0.6943.99 "--annotation=exe=C:\Program Files (x86)\Microsoft\Edge\Application\133.0.3065.69\Installer\setup.exe" --annotation=plat=Win64 --annotation=prod=Edge --annotation=ver=133.0.3065.69 --initial-client-data=0x224,0x228,0x22c,0x200,0x230,0x7ff6bd406a68,0x7ff6bd406a74,0x7ff6bd406a80
            4⤵
            • Executes dropped EXE
            PID:4212
    • C:\Windows\System32\svchost.exe
      C:\Windows\System32\svchost.exe -k AppReadiness -p -s AppReadiness
      1⤵
        PID:2244
      • C:\Program Files\WindowsApps\Microsoft.MicrosoftOfficeHub_18.1903.1152.0_x64__8wekyb3d8bbwe\LocalBridge.exe
        "C:\Program Files\WindowsApps\Microsoft.MicrosoftOfficeHub_18.1903.1152.0_x64__8wekyb3d8bbwe\LocalBridge.exe" /InvokerPRAID: Microsoft.MicrosoftOfficeHub prelaunch
        1⤵
          PID:4012
        • C:\Windows\system32\wwahost.exe
          "C:\Windows\system32\wwahost.exe" -ServerName:Microsoft.MicrosoftOfficeHub.wwa
          1⤵
          • Modifies Internet Explorer settings
          • Modifies registry class
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of SetWindowsHookEx
          PID:3420

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Program Files (x86)\Microsoft\EdgeUpdate\Install\{778F1860-BE00-49C3-B676-D96854178075}\EDGEMITMP_3A54A.tmp\setup.exe

          Filesize

          6.8MB

          MD5

          bdb1aecedc15fc82a63083452dad45c2

          SHA1

          a074fcd78665ff90ee3e50ffcccad5f6c3e7ddcb

          SHA256

          4ea0907c3fc2c2f6a4259002312671c82e008846d49957bb3b9915612e35b99f

          SHA512

          50909640c2957fc35dd5bcac3b51797aa5daa2fb95364e69df95d3577482e13f0c36a70ae098959cb9c2aaeb4cfe43025c1d8d55b5f8858b474bcb702609749d

        • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe

          Filesize

          3.9MB

          MD5

          4aaa893417cccc147989f876c6a7b295

          SHA1

          b1e35c83518bb275924ead0cd6206bf0c982d30f

          SHA256

          2c38e3c3f18e2d3fb7f04336356b9b5186cabe06b3343beec318ef0def1a9eeb

          SHA512

          109e0c88977fae65a4950fc38393ca32a70d68ef41aeb75b28e6566e0fa626e32e31be38308e7ed5b6a8ba1f56fb5f2133a07aa8bb643224c3dbb089ce9cfd0e

        • C:\Program Files\msedge_installer.log

          Filesize

          73KB

          MD5

          b4b0cfcdf56454ce2193b9c9615e50b9

          SHA1

          70ff79d74fcdf5521b6f05348c48a139d6446ac9

          SHA256

          aa91151f56bfc4cf8fab99d1f20ab5ad04cb5219266ad906d9e695fc249f55a9

          SHA512

          d35be5a7833730a1404a4d0fb739bd9eaacbc99a6a765f1ddde0fd8e357da943f72de4d07d3533213971b939d8a3071cc9d71ce46d18259f38a61334a1681ae4

        • C:\Program Files\msedge_installer.log

          Filesize

          98KB

          MD5

          354b0fd1095678e244702046b5a73398

          SHA1

          3cace6d639d31cf30422aa12abb0dc12dc7ecfb0

          SHA256

          8ae8d554b90a2d615f57dfdc0a6d6057268fd6ff7f0d7e0b0deb2324dfc8f8d7

          SHA512

          732c9d22822ad37e33408c6b0ca1ef7cd14572387f6c34f3f46d53cf2db7effb2b2caf2ee38ffb4002dc42277d59d6f653764e83e31c924c80f3feed97e108b7

        • C:\Program Files\msedge_installer.log

          Filesize

          99KB

          MD5

          6036d0f7caf70ad750522c3630e9d371

          SHA1

          0ece62dac25e54466687a2619973cb0739c74b42

          SHA256

          2933649dca62af3d282f6c4f37c7626095fc5fbd13da3b9dd23195d09e3e8d9e

          SHA512

          3077a34dc868d1e48b2e2edba032db6ce6defb62ed28d16f9c177b28039a66aad21926cf9f0d1b548b1d6852a7f764bbf1bbcb67e22e4b5446f8060d393fffc7

        • C:\Program Files\msedge_installer.log

          Filesize

          104KB

          MD5

          61d7df3665e5031fd9825c95075cecbb

          SHA1

          fb13ff66e97a566f9fb0113d2135a2f35a10b2d5

          SHA256

          f254e3000e4ff70198cff0c631ef68e017aa2deb6def2e9233228872189b111d

          SHA512

          716b50aa5cc5f184252866d642baef5a44894e43da2ee27e7d3075334eb51d494fcad30c417b5f657a6627e38c2c50bb922a8a7094edf12e5ae5d43ed2c56375

        • memory/4012-71-0x0000023D7CE20000-0x0000023D7CE2E000-memory.dmp

          Filesize

          56KB

        • memory/4012-72-0x0000023D7EFB0000-0x0000023D7EFBA000-memory.dmp

          Filesize

          40KB

        • memory/4012-73-0x0000023D7EFE0000-0x0000023D7EFE8000-memory.dmp

          Filesize

          32KB

        • memory/4012-74-0x0000023D18600000-0x0000023D18849000-memory.dmp

          Filesize

          2.3MB