Analysis

  • max time kernel
    120s
  • max time network
    100s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240611-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240611-enlocale:en-usos:windows10-2004-x64system
  • submitted
    13-06-2024 03:51

General

  • Target

    2024-06-13_d3b25507101c1664beb2e07bc784b0bb_bkransomware.exe

  • Size

    71KB

  • MD5

    d3b25507101c1664beb2e07bc784b0bb

  • SHA1

    44762e2e73d6c43cc6f544cd2b78442e7f772c4b

  • SHA256

    e5b966e0e1e54ddf6ea0e78fe0e1bad3c08a7872f789cdde9d5a6a810cbd492b

  • SHA512

    ce21be09b627735dcf49a50605a6776edd33eb58368c9379645b0f7e35fe2c127b5d8ea932c85f25d5e974ff118857aaee83e5c0bec646944b8a7ea2efe122a9

  • SSDEEP

    1536:Fc897UsWjcd9w+AyabjDbxE+MwmvlDuazTI:ZhpAyazIlyazTI

Malware Config

Signatures

  • 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.

  • 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 3 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2024-06-13_d3b25507101c1664beb2e07bc784b0bb_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-06-13_d3b25507101c1664beb2e07bc784b0bb_bkransomware.exe"
    1⤵
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1012
    • 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:1280

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

    394KB

    MD5

    6750bf0c5f2d8d70eac1449c4cf7d881

    SHA1

    1ac0dd3f2fe32609256c1b98c70fb68fa27e5da6

    SHA256

    d7392e038f3e3023c6464f81a11ab22fe566aae50f01821a0dd9dacdf727ab88

    SHA512

    0880edcd1fceea820d019c13caf02bd3cc78bd68dea4a98d73e8888cf205cb7c0771676dfe811004658160a304abe68c83bf3f33aa92e9df2f3223590e3f64f0

  • C:\Users\Admin\AppData\Local\Temp\mkW4aGS15EZkymD.exe

    Filesize

    71KB

    MD5

    dd109eaeda70c835005847214547f656

    SHA1

    ca848099434f0e8fe098e21fec098403d2554048

    SHA256

    d6eecfa9d844a61ec1a111a3b2851208206f81d08e001c46df2842b54e64d0ac

    SHA512

    38305f4ae65aac1c73cb2cc8a00cd5dbc4d78d316bcade66fa686e21bf773c1ebbbf2acc343d2ef460bd6e81aa70779ef94b22021aa6adacff9531b6e7c7e81d

  • C:\Windows\CTS.exe

    Filesize

    71KB

    MD5

    66df4ffab62e674af2e75b163563fc0b

    SHA1

    dec8a197312e41eeb3cfef01cb2a443f0205cd6e

    SHA256

    075a6eecd8da1795532318f9cf880efe42461f9464d63f74deb271d33110f163

    SHA512

    1588dd78e6e8972013c40cdb6acfb84c8df7b081197233ce621904b645356c805d0424bb93dd46c55834dc47d9ff39ee1323cf8e670841b3fff24ab98ba87f25