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Analysis

  • max time kernel
    132s
  • max time network
    128s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240419-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240419-enlocale:en-usos:windows10-2004-x64system
  • submitted
    08/05/2024, 03:42

General

  • Target

    2024-05-08_04b8127757b255a0ddd8c439136249e2_bkransomware.exe

  • Size

    71KB

  • MD5

    04b8127757b255a0ddd8c439136249e2

  • SHA1

    f55213963df1a849291d52767a652148a6f07e0b

  • SHA256

    299169bc7a4687aa3fd1f1fbaa951b8a75229840ce61a06677234b5bda46817a

  • SHA512

    ac162a538746d479bf6e35e682ce2eb51ec57e529329ddf23ac4a67fbffd81f715d73c954577ccf480f1a1db14da84cd95999c6a0d8a31d1570d8131221db496

  • SSDEEP

    1536:Fc8N7UsWjcd9w+AyabjDbxE+MwmvlzuazT3m:ZRpAyazIliazT2

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\2024-05-08_04b8127757b255a0ddd8c439136249e2_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-05-08_04b8127757b255a0ddd8c439136249e2_bkransomware.exe"
    1⤵
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3652
    • 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:3252

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

    392KB

    MD5

    caa490350e7ff566510d42e95635e332

    SHA1

    038edc03163f57a59cc28cdb7bcd5f347bc7937d

    SHA256

    3fad9a63769e27d3c4bf60e822075dd55aeebac24cef9924211b5790f0d08582

    SHA512

    28367f2cffa8b7652c577eb7692efa0e813802735d9298e0b2d715e2489ce8a93980ed295dff3fcaad836e4e6eebff8eb6dcef9d714f3858d4a2a51857ced940

  • C:\Users\Admin\AppData\Local\Temp\QQz80ALtML4YJcR.exe

    Filesize

    71KB

    MD5

    a7050faaf6bfa2e400a6fe243835a0bf

    SHA1

    61817d403cfb51f26e205971452f6bc0442e8051

    SHA256

    244662c63a513a942fb7c366c549ecf9ed2f60bb82d55ee95d19b4e6ba315371

    SHA512

    b99ce9881a66e8d0ffefa774598885794a029ec77fc99dbb774455d13a9f0c489b7db0febe70ba38d9628ed6889f239eee5f51e0e74d4dc2b1cf5d6321ceb053

  • C:\Windows\CTS.exe

    Filesize

    71KB

    MD5

    f9d4ab0a726adc9b5e4b7d7b724912f1

    SHA1

    3d42ca2098475924f70ee4a831c4f003b4682328

    SHA256

    b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc

    SHA512

    22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432