Analysis

  • max time kernel
    133s
  • max time network
    102s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    27/05/2024, 14:39

General

  • Target

    2024-05-27_ea244df2ceec4693ddb3cab2824334aa_bkransomware.exe

  • Size

    214KB

  • MD5

    ea244df2ceec4693ddb3cab2824334aa

  • SHA1

    6bdc52f7bd23e31905149fedac31166c05e15a52

  • SHA256

    20385a70d740d5a8260450df7f5cc67d7f33cc04d1f58685949237233f47c1ab

  • SHA512

    827591a16355a29ed02d854eda56a2c6ce4d0f06032e1038b65f1101ff9e05fc4e834d300adfbbb58484686c6caed2e92f342e7524d1da8e8e05d74b4fca2212

  • SSDEEP

    3072:ZRpAyazIliazTcYubxmW6OrYhmBC9IdlIWuazrA8aqcnPVJIqi65z9zVJwP:xZ8azoYKmOAmEuzspnPDIU95JA

Malware Config

Signatures

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

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

  • Adds Run key to start application 2 TTPs 2 IoCs
  • Drops file in Windows directory 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 5 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2024-05-27_ea244df2ceec4693ddb3cab2824334aa_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-05-27_ea244df2ceec4693ddb3cab2824334aa_bkransomware.exe"
    1⤵
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2996
    • C:\Users\Admin\AppData\Local\Temp\4GbiKKhKI7gFJTj.exe
      C:\Users\Admin\AppData\Local\Temp\4GbiKKhKI7gFJTj.exe
      2⤵
      • Executes dropped EXE
      PID:3092
    • C:\Windows\CTS.exe
      "C:\Windows\CTS.exe"
      2⤵
      • Executes dropped EXE
      • Adds Run key to start application
      • Drops file in Windows directory
      • Suspicious use of AdjustPrivilegeToken
      PID:2128

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        • C:\Users\Admin\AppData\Local\Microsoft\Office\16.0\excel.exe_Rules.xml

          Filesize

          395KB

          MD5

          a27d321b9201f0686d4e6745cf50f96d

          SHA1

          c2502a64d09fb728636e195b6e65a6aee1d10e34

          SHA256

          1d1331bd0fc59344b83a246324f1271137e0435a5a288ac696bc0aeb4672ae4b

          SHA512

          c9a9a9989980befeadcb61f3b666a95ae655279e5b27f41c6d78d76c27bc17726b1d71c04d271dba7af84bc3287eba43b24ad78806f9d11c284344a9ab33c8a0

        • C:\Users\Admin\AppData\Local\Temp\4GbiKKhKI7gFJTj.exe

          Filesize

          143KB

          MD5

          38f108cddb6619fba80f8382d5227ece

          SHA1

          12fd277bf756f22cfae3043900e4aff8b9f05ed9

          SHA256

          8296fe257b8c34398e3f291764454ec3cd9cbe06d60989b632ef4ba6c73ae5dc

          SHA512

          3db732c23f10122c78cffc6b6a5b11836ade1a23f5c6f9a192f2be2fa99c5bd7afb7a9e29c5d518a888cdd2091f9ac41b244214be226152830e96f5ec2cca424

        • C:\Windows\CTS.exe

          Filesize

          71KB

          MD5

          f9d4ab0a726adc9b5e4b7d7b724912f1

          SHA1

          3d42ca2098475924f70ee4a831c4f003b4682328

          SHA256

          b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc

          SHA512

          22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432

        • memory/3092-14-0x00007FFFF3A33000-0x00007FFFF3A35000-memory.dmp

          Filesize

          8KB

        • memory/3092-15-0x0000000000B10000-0x0000000000B38000-memory.dmp

          Filesize

          160KB

        • memory/3092-24-0x00007FFFF3A30000-0x00007FFFF44F1000-memory.dmp

          Filesize

          10.8MB

        • memory/3092-32-0x00007FFFF3A30000-0x00007FFFF44F1000-memory.dmp

          Filesize

          10.8MB