Analysis

  • max time kernel
    129s
  • max time network
    173s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240611-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240611-enlocale:en-usos:windows10-2004-x64system
  • submitted
    27/06/2024, 16:01

General

  • Target

    eb82946fa0de261e92f8f60aa878c9fef9ebb34fdababa66995403b110118b12.exe

  • Size

    147KB

  • MD5

    448f1796fe8de02194b21c0715e0a5f6

  • SHA1

    935c0b39837319fda571aa800b67d997b79c3198

  • SHA256

    eb82946fa0de261e92f8f60aa878c9fef9ebb34fdababa66995403b110118b12

  • SHA512

    0b93b2c881b1351ff688089abf12bbfcff279c5d6ca8733d6d821c83148d73c85cfedf5ab5bc02c2145970124b518551db3a9fc701d8084f01009ae20f71a831

  • SSDEEP

    3072:l6glyuxE4GsUPnliByocWep0yjEJ3hDRMK89nB2:l6gDBGpvEByocWeebbMjV4

Malware Config

Extracted

Path

C:\sYMY1N6ah.README.txt

Ransom Note
*** Welcome to Brain Cipher Ransomware! *** Dear managers! If you're reading this, it means your systems have been hacked and encrypted and your data stolen. *** The most proper way to safely recover your data is through our support. We can recover your systems within 4-6 hours. In order for it to be successful, you must follow a few points: 1.Don't go to the police, etc. 2.Do not attempt to recover data on your own. 3.Do not take the help of third-party data recovery companies. In most cases, they are scammers who will pay us a ransom and take a for themselves. *** If you violate any 1 of these points, we will refuse to cooperate with you!!! 3 steps to data recovery: 1. Download and install Tor Browser (https://www.torproject.org/download/) 2. Go to our support page: http://mybmtbgd7aprdnw2ekxht5qap5daam2wch25coqerrq2zdioanob34ad.onion 3. Enter your encryption ID: M8AL5cWJEU5CnMMPwCdt4x9NVn0ZY2uNtIgnKwkDJwdPbnanVROYFzGmgUCImexTGDmINYgSZXdlhM7D199lNMb294TGY2 Email to support: [email protected]
URLs

http://mybmtbgd7aprdnw2ekxht5qap5daam2wch25coqerrq2zdioanob34ad.onion

Signatures

  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Drops desktop.ini file(s) 2 IoCs
  • Suspicious use of NtSetInformationThreadHideFromDebugger 5 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Opens file in notepad (likely ransom note) 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: RenamesItself 26 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 7 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\eb82946fa0de261e92f8f60aa878c9fef9ebb34fdababa66995403b110118b12.exe
    "C:\Users\Admin\AppData\Local\Temp\eb82946fa0de261e92f8f60aa878c9fef9ebb34fdababa66995403b110118b12.exe"
    1⤵
    • Drops desktop.ini file(s)
    • Suspicious use of NtSetInformationThreadHideFromDebugger
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2980
    • C:\ProgramData\F4A1.tmp
      "C:\ProgramData\F4A1.tmp"
      2⤵
      • Checks computer location settings
      • Deletes itself
      • Executes dropped EXE
      • Suspicious use of NtSetInformationThreadHideFromDebugger
      • Suspicious behavior: RenamesItself
      • Suspicious use of WriteProcessMemory
      PID:3484
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C DEL /F /Q C:\PROGRA~3\F4A1.tmp >> NUL
        3⤵
          PID:2072
    • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
      "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=1032,i,4778049104057176787,6631751660692402210,262144 --variations-seed-version --mojo-platform-channel-handle=4132 /prefetch:8
      1⤵
        PID:3392
      • C:\Windows\System32\rundll32.exe
        C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
        1⤵
          PID:3088
        • C:\Windows\system32\NOTEPAD.EXE
          "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\Downloads\sYMY1N6ah.README.txt
          1⤵
          • Opens file in notepad (likely ransom note)
          PID:4640

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\$Recycle.Bin\S-1-5-21-3665033694-1447845302-680750983-1000\desktop.ini

          Filesize

          129B

          MD5

          90cd02c95be36b51b049732d9208e5f2

          SHA1

          e32a15820cd7a49ac517cc0101393c699a478228

          SHA256

          689b4d54f16ad2e5613aef14b7abcaf017caacb70d2470f2aad9d8e604c53fdc

          SHA512

          c00c617f8be04d6570152465cc1ffda2ed58d876a5be8a0bf8383e58cce4d3ae9f85f9a87080d354aa2cdb733d501dc25cf7f84d3c9485f59f357ff9d90bacbe

        • C:\ProgramData\F4A1.tmp

          Filesize

          14KB

          MD5

          294e9f64cb1642dd89229fff0592856b

          SHA1

          97b148c27f3da29ba7b18d6aee8a0db9102f47c9

          SHA256

          917e115cc403e29b4388e0d175cbfac3e7e40ca1742299fbdb353847db2de7c2

          SHA512

          b87d531890bf1577b9b4af41dddb2cdbbfa164cf197bd5987df3a3075983645a3acba443e289b7bfd338422978a104f55298fbfe346872de0895bde44adc89cf

        • C:\Users\Admin\AppData\Local\Temp\DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD

          Filesize

          147KB

          MD5

          098d35f54bf27920d7a50931bd27e37c

          SHA1

          5ce9c736c974a70ab4ff304e55614b6ac7799def

          SHA256

          0caaa3d6a16fcac64531b987affb7c80e6dd072f1a068efab934cbf1596492d8

          SHA512

          a047172991df541f3856d44d874410adfd1bd1388568e1a1b70ffe6e1a27cb4513ce77c591a8fc9991e164c1769ceaff0267fc32a5352a3f28cbc5fb5c0bec79

        • C:\sYMY1N6ah.README.txt

          Filesize

          1KB

          MD5

          deb2e0756d331362d57ad9fe408c4ff3

          SHA1

          870865aad7c7cccafbca0c1f50f7eecaedbd4bf1

          SHA256

          1ddacee1d25936970279557169037a335b362f86c3797ded625d68077bd0145c

          SHA512

          e218624d2704517a358df0dfb794116bbeed3ad81daae8c07d5d969e61e7936ed043911008f4816d663de373fd23515219c8038dd22e5838af7df1678a0134a6

        • F:\$RECYCLE.BIN\S-1-5-21-3665033694-1447845302-680750983-1000\DDDDDDDDDDD

          Filesize

          129B

          MD5

          44be399d4316479fb4b9210037b42bb2

          SHA1

          3bb14291d4e2d227c902efd58425f7b1cc569840

          SHA256

          04047abb0c6bfc8b7886addd4696ab2fe7f28a9814971f30a31a6560512e9aa6

          SHA512

          4ffb591bead2d0141ab99929cbd403d6a9ed3658332805818e029672c85a86764dd18acac5356cf108bb1e470c509e3bc37fd19f275495dabbdda345630e4f5a

        • memory/2980-1-0x0000000000F40000-0x0000000000F50000-memory.dmp

          Filesize

          64KB

        • memory/2980-2-0x0000000000F40000-0x0000000000F50000-memory.dmp

          Filesize

          64KB

        • memory/2980-0-0x0000000000F40000-0x0000000000F50000-memory.dmp

          Filesize

          64KB

        • memory/3484-3033-0x000000007FDC0000-0x000000007FDC1000-memory.dmp

          Filesize

          4KB

        • memory/3484-3032-0x000000007FE20000-0x000000007FE21000-memory.dmp

          Filesize

          4KB

        • memory/3484-3030-0x0000000002480000-0x0000000002490000-memory.dmp

          Filesize

          64KB

        • memory/3484-3029-0x000000007FE40000-0x000000007FE41000-memory.dmp

          Filesize

          4KB

        • memory/3484-3031-0x0000000002480000-0x0000000002490000-memory.dmp

          Filesize

          64KB

        • memory/3484-3063-0x000000007FE00000-0x000000007FE01000-memory.dmp

          Filesize

          4KB

        • memory/3484-3062-0x000000007FDE0000-0x000000007FDE1000-memory.dmp

          Filesize

          4KB