Analysis

  • max time kernel
    79s
  • max time network
    99s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    12-06-2024 14:41

General

  • Target

    2024-06-12_679c3344329b0d32d28bd1c392772082_bkransomware.exe

  • Size

    71KB

  • MD5

    679c3344329b0d32d28bd1c392772082

  • SHA1

    e321ef63f793d6c76378c73bf9fc43a86c57fff4

  • SHA256

    cea8457cf83420c20d47290e0527895f0c572d68527ad2e0011e1e64827e40ba

  • SHA512

    ed787a9d5b152b8b29671c215b71390b004fdec74d137058410ffa4051b9a32679447b75d89bce901f0292d810cadf82d9d9f63c2f42fba3502d3709576b3acb

  • SSDEEP

    1536:Fc897UsWjcd9w+AyabjDbxE+MwmvlDuazTo:ZhpAyazIlyazTo

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\2024-06-12_679c3344329b0d32d28bd1c392772082_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-06-12_679c3344329b0d32d28bd1c392772082_bkransomware.exe"
    1⤵
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1948
    • 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:2668

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

    b03b6832030712c8a8548971395c096d

    SHA1

    2ade28577a355a836f86d040e8449c3f402e2525

    SHA256

    bed1952f9342b9654dab71f4b109f0bde5f3df08ed13bc71f17366c897556bb7

    SHA512

    a4f1c546cdbe58a9169097deb8966f5cf7948d571671a68a350eddcb6cea56a005147a80eb60b65efc7032ed73f04bcb7b7ecb9922e47bef29082d2b1a7587a3

  • C:\Users\Admin\AppData\Local\Temp\5a96ioTSiMwv4Iv.exe

    Filesize

    71KB

    MD5

    8890adb076704c4003ed7c9376ead293

    SHA1

    42cace7a4c0d12981345577d2f5b3c1093f21bd5

    SHA256

    87c18c571438afe98f843eb4445573a564d61783ac8fd2332f79cab1a384f6f0

    SHA512

    ff9961e3834ed79ec07baab3386fb81da870ac2bc641387d17849da1e8870949b7b3c6033e7cceb4e0a8e6a5a0c099670812d78f3420e141f91a6455ff8d2bef

  • C:\Windows\CTS.exe

    Filesize

    71KB

    MD5

    66df4ffab62e674af2e75b163563fc0b

    SHA1

    dec8a197312e41eeb3cfef01cb2a443f0205cd6e

    SHA256

    075a6eecd8da1795532318f9cf880efe42461f9464d63f74deb271d33110f163

    SHA512

    1588dd78e6e8972013c40cdb6acfb84c8df7b081197233ce621904b645356c805d0424bb93dd46c55834dc47d9ff39ee1323cf8e670841b3fff24ab98ba87f25