Analysis

  • max time kernel
    94s
  • max time network
    157s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240426-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
  • submitted
    30/05/2024, 23:21

General

  • Target

    2024-05-30_12f7df5c56ce986d404ead898b7d018b_bkransomware.exe

  • Size

    96KB

  • MD5

    12f7df5c56ce986d404ead898b7d018b

  • SHA1

    51dff6b4b3bf52ea0c893bc2006114f9a93ba323

  • SHA256

    e75499cde0fb6d99a85ec69640e10101d83c5f71c71568dcb5cc83742ccaef34

  • SHA512

    79b45be806ff912044f45cc0348fe95cbdf4774436381a60c865482f506952c1a042eb685fb15046d80fae767f3e31dbff5e40e131a985b0f9a45c3873131d30

  • SSDEEP

    1536:Fc8N7UsWjcd9w+AyabjDbxE+MwmvlzuazTstkGguY2o6uOJb:ZRpAyazIliazTJ2o6uUb

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\2024-05-30_12f7df5c56ce986d404ead898b7d018b_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-05-30_12f7df5c56ce986d404ead898b7d018b_bkransomware.exe"
    1⤵
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2472
    • C:\Users\Admin\AppData\Local\Temp\UrvPRdtUvmJuMln.exe
      C:\Users\Admin\AppData\Local\Temp\UrvPRdtUvmJuMln.exe
      2⤵
      • Executes dropped EXE
      PID:1512
    • 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:4860

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

          46c2375504b8692da9c7967dbe0095a8

          SHA1

          613aac0889ec5564ea176ec55fb18c62ac1bcd32

          SHA256

          5022c8a9fd7925bd5487920504a22f6f240339fe7640131d8d071b65e7f1a851

          SHA512

          31ea007cc95ce336e3b05a236e69429887881ec22bb9d8f196eeca15197b25a930d57f4d160d64391d55046d72bff0e04ec19f0497d00db0bb524fd350eff9a5

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

          Filesize

          25KB

          MD5

          abbd49c180a2f8703f6306d6fa731fdc

          SHA1

          d63f4bfe7f74936b2fbace803e3da6103fbf6586

          SHA256

          5f411c0bd9ed9a42b0f07ed568c7d0cf358a83063b225a1f8f7da3296dde90f1

          SHA512

          290dd984acc451b778f3db8c510bae7aec1d9547c3ad0a1829df731c136e4ecc9a37dc6a786cf8f1ecc4d14339aed1288af25055f450f6f953138c8d4d5c36e9

        • C:\Windows\CTS.exe

          Filesize

          71KB

          MD5

          f9d4ab0a726adc9b5e4b7d7b724912f1

          SHA1

          3d42ca2098475924f70ee4a831c4f003b4682328

          SHA256

          b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc

          SHA512

          22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432

        • memory/1512-9-0x0000000000400000-0x000000000040D000-memory.dmp

          Filesize

          52KB