Analysis

  • max time kernel
    94s
  • max time network
    96s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240426-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
  • submitted
    08/06/2024, 20:30

General

  • Target

    2024-06-08_2815684073507e15c829f28b4a99e23a_bkransomware.exe

  • Size

    71KB

  • MD5

    2815684073507e15c829f28b4a99e23a

  • SHA1

    3c161d220465e31364f586d96195ba25fba43901

  • SHA256

    08564def6f60d4abf5c52eb0c6136edc989d23d315dedea2fba9592fce938daa

  • SHA512

    23233f205ddba5af4fc6c382540851b5fbbcc9a29f3792707a1fea99b5ae7a017027b66a5fc40561c110b4cd8a80a86f322d2bb85c7ec62efbde39e862d1f4ca

  • SSDEEP

    1536:Fc8N7UsWjcd9w+AyabjDbxE+MwmvlzuazTS:ZRpAyazIliazTS

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\2024-06-08_2815684073507e15c829f28b4a99e23a_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-06-08_2815684073507e15c829f28b4a99e23a_bkransomware.exe"
    1⤵
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2972
    • 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:3248

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

          54be80e502b47ad9464dbcca4e55248a

          SHA1

          2c21601f1ad47c5ad8b1fb7632e7b4c8f884b3b1

          SHA256

          02e16e50aea04b40707c691c4de9836b0bbdf94aba1ca44ad0ef296dfd0f5f6b

          SHA512

          75830f991b4e2cab8acb8f57472e86e117cae57425b6eed3fdb54e331621c9e3b0615be6fb2be8a49a7d92e0ab6ac0db2db74ab8fd91d43e3cebd3601dc49693

        • C:\Users\Admin\AppData\Local\Temp\61xgIojPh0E5foQ.exe

          Filesize

          71KB

          MD5

          26c0e40729470bafbf964bdbcae1137a

          SHA1

          1f371ad7fdc4b81aab41c82d70e95255aaa8f365

          SHA256

          dc309532082bf4376c10e22634f764187fdd7634cdced5720e6dcb4f3f1f4bbd

          SHA512

          ff889d57e2ada8ea80d642edca3bc72b13f361db82619d8ea932a4acd57555e53e0fe6afdaf36319b5a2f015133fc90bb945562814f3324414beaf92d9351970

        • C:\Windows\CTS.exe

          Filesize

          71KB

          MD5

          f9d4ab0a726adc9b5e4b7d7b724912f1

          SHA1

          3d42ca2098475924f70ee4a831c4f003b4682328

          SHA256

          b43be87e8586ca5e995979883468f3b3d9dc5212fbfd0b5f3341a5b7c56e0fbc

          SHA512

          22a5f0e4b2716244e978ee50771823926f86baf0382ece48fd049f039cf77b5eb0691d83c61148903cff081fdbea969f47b8ed521647717f42bbed5c64552432