Analysis

  • max time kernel
    92s
  • max time network
    97s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240426-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03-06-2024 09:30

General

  • Target

    2024-06-03_3213c6175c2f1919a41d773c7d62d395_bkransomware.exe

  • Size

    71KB

  • MD5

    3213c6175c2f1919a41d773c7d62d395

  • SHA1

    f89f3488d223f1ac843900669ea39f5faee55ad0

  • SHA256

    3ce3210ade8bb1bc8281b764344310669f6582c14900970aa5d97876893fd08e

  • SHA512

    678e84271b9b95101862ebda3d2fa7da8b4c9b71a3e01ca892bdb9956751c9e2c9859e84885e36b0021874924881a7c8b3e20aec3bc212e44a70c24320dc0a07

  • SSDEEP

    1536:Fc8N7UsWjcd9w+AyabjDbxE+MwmvlzuazT7:ZRpAyazIliazT7

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\2024-06-03_3213c6175c2f1919a41d773c7d62d395_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-06-03_3213c6175c2f1919a41d773c7d62d395_bkransomware.exe"
    1⤵
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4844
    • 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:5096

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

    a04cb62372e364d86da86176b1f898bc

    SHA1

    b66444e8c72356a18a9061bfc3c9520aaec7a3ab

    SHA256

    fb2cfb0c8c88a4afeed0864f58e04b1ca74635e3970c146c426f7e321cac3c9a

    SHA512

    fde929239d6a53d83154c0c15b88ceac8cb60879ec0638171ab16d718e8bcb646f53e26d8b2561346ebec82d00cdf54eb7a9e3ed2e4dbcc69333839cf906436f

  • C:\Users\Admin\AppData\Local\Temp\3HPWD7baALU7TcK.exe

    Filesize

    71KB

    MD5

    397a82e14c3fff2b778685c4ec57aa5e

    SHA1

    b0c1e81175d1da4ecf73a98ddb7c2a365d4ac28c

    SHA256

    9da976d102d94e74ffbba2a18f0a25c044b0bac86e234a8f66e6eefa36f5ba5b

    SHA512

    c75bf5728bf6f95e55dd0c104369b60b9196935cb7506a8ece3c997efcdf7a32a3355e3cd645b9339e2c063d0d96b80eb6c0768b8122741174bdab2d4d71c9fb

  • C:\Windows\CTS.exe

    Filesize

    71KB

    MD5

    f9d4ab0a726adc9b5e4b7d7b724912f1

    SHA1

    3d42ca2098475924f70ee4a831c4f003b4682328

    SHA256

    b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc

    SHA512

    22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432