Analysis

  • max time kernel
    42s
  • max time network
    37s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240709-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
  • submitted
    16-07-2024 13:57

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

Family

braincipher

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

  • Brain Cipher

    Ransomware family based on Lockbit that was first observed in June 2024.

  • 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).

  • 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:3728
    • C:\ProgramData\B71B.tmp
      "C:\ProgramData\B71B.tmp"
      2⤵
      • Checks computer location settings
      • Deletes itself
      • Executes dropped EXE
      • Suspicious use of NtSetInformationThreadHideFromDebugger
      • Suspicious behavior: RenamesItself
      • Suspicious use of WriteProcessMemory
      PID:2512
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C DEL /F /Q C:\PROGRA~3\B71B.tmp >> NUL
        3⤵
          PID:4284

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\$Recycle.Bin\S-1-5-21-2650514177-1034912467-4025611726-1000\CCCCCCCCCCC

      Filesize

      129B

      MD5

      30b8d7f370ba013aa131c0a599f3fb3c

      SHA1

      1dfe367f17b63ed3a47e928d828417b0121ba7b8

      SHA256

      f4882c18f932e00e6ab0f15b4adaa27e122e55c3813e8dcda6d0dee58a2152ef

      SHA512

      3028df79635f3fee9ffc442ddc2f5f33f695f9eb80095a4b0d03692466e45f5bd441a6216a6626d9199a8939c370a4df639f5c0e6dce8a6542b9310d0632fff0

    • C:\ProgramData\B71B.tmp

      Filesize

      14KB

      MD5

      294e9f64cb1642dd89229fff0592856b

      SHA1

      97b148c27f3da29ba7b18d6aee8a0db9102f47c9

      SHA256

      917e115cc403e29b4388e0d175cbfac3e7e40ca1742299fbdb353847db2de7c2

      SHA512

      b87d531890bf1577b9b4af41dddb2cdbbfa164cf197bd5987df3a3075983645a3acba443e289b7bfd338422978a104f55298fbfe346872de0895bde44adc89cf

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

      Filesize

      147KB

      MD5

      307ce86ad65635ea5b3d4db095eaebfa

      SHA1

      41bc5a5cb30bcccafee9f8a09a913b6073ba29c2

      SHA256

      5cc06e289f5545533a6c6de76bea69527edbcfcb644db5c8447827d132375d94

      SHA512

      216e49b9c33fa67b91d0e6c55e2fa6925a4955d6a0e1f629b5e3a64c2da45649967b44c4d8cc34687ba241945e702d1bec9126cff749f08c95b305b9e2b0af61

    • C:\sYMY1N6ah.README.txt

      Filesize

      1KB

      MD5

      deb2e0756d331362d57ad9fe408c4ff3

      SHA1

      870865aad7c7cccafbca0c1f50f7eecaedbd4bf1

      SHA256

      1ddacee1d25936970279557169037a335b362f86c3797ded625d68077bd0145c

      SHA512

      e218624d2704517a358df0dfb794116bbeed3ad81daae8c07d5d969e61e7936ed043911008f4816d663de373fd23515219c8038dd22e5838af7df1678a0134a6

    • F:\$RECYCLE.BIN\S-1-5-21-2650514177-1034912467-4025611726-1000\DDDDDDDDDDD

      Filesize

      129B

      MD5

      a6f69e99f08c14c8875492a48d9fd707

      SHA1

      a6355c24e8316274921f288c27deab9ff70525b3

      SHA256

      ec2d69019b9c75e02280cc36ad43fd8763a01c1ae0840146b2622720f8ad1924

      SHA512

      b14096a343100ed02c34db21ae5cf79a48093a9f6fc3b28353a083877db50141d276ed7940dc7cd0a4dc498752dd3e963de393f93806b9af3b18e7ee2a772aa1

    • memory/2512-2954-0x000000007FE20000-0x000000007FE21000-memory.dmp

      Filesize

      4KB

    • memory/2512-2955-0x000000007FDC0000-0x000000007FDC1000-memory.dmp

      Filesize

      4KB

    • memory/2512-2953-0x0000000002620000-0x0000000002630000-memory.dmp

      Filesize

      64KB

    • memory/2512-2952-0x0000000002620000-0x0000000002630000-memory.dmp

      Filesize

      64KB

    • memory/2512-2951-0x000000007FE40000-0x000000007FE41000-memory.dmp

      Filesize

      4KB

    • memory/2512-2985-0x000000007FE00000-0x000000007FE01000-memory.dmp

      Filesize

      4KB

    • memory/2512-2984-0x000000007FDE0000-0x000000007FDE1000-memory.dmp

      Filesize

      4KB

    • memory/3728-0-0x0000000002F30000-0x0000000002F40000-memory.dmp

      Filesize

      64KB

    • memory/3728-1-0x0000000002F30000-0x0000000002F40000-memory.dmp

      Filesize

      64KB

    • memory/3728-2-0x0000000002F30000-0x0000000002F40000-memory.dmp

      Filesize

      64KB