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Analysis

  • max time kernel
    141s
  • max time network
    105s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240426-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
  • submitted
    09/05/2024, 14:58

General

  • Target

    2024-05-09_bbf5bac9498602c3d3a34575a7a80d8a_bkransomware.exe

  • Size

    135KB

  • MD5

    bbf5bac9498602c3d3a34575a7a80d8a

  • SHA1

    94fc2a3ea37a0dbec1bee2ba7b81871ef023415c

  • SHA256

    3e11dfbd50ae05e09e6408a6f9b0abfc27faa11ecfc121fccdab5abc18128bac

  • SHA512

    5e4522aca1180279ebfdf392ca5a1f459b0674af0d4f65672e5335c427d3a8b4ce212995fecc6fd7fe421e733547a29b8245bacf36c5660953624b6f308f3d3c

  • SSDEEP

    3072:ZhpAyazIlyazTECIFnXHdachgD6cdaB7GjwA8Qq1L:hZMazzIx9acO9dQ7GjwA8NL

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 6 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2024-05-09_bbf5bac9498602c3d3a34575a7a80d8a_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-05-09_bbf5bac9498602c3d3a34575a7a80d8a_bkransomware.exe"
    1⤵
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1132
    • C:\Users\Admin\AppData\Local\Temp\ilzz7njItouhIyD.exe
      C:\Users\Admin\AppData\Local\Temp\ilzz7njItouhIyD.exe
      2⤵
      • Executes dropped EXE
      PID:1656
    • 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:3788

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

    789KB

    MD5

    6965f4afd5fbfd1cb1675367f20bd3cd

    SHA1

    b5226723a1d267ef11cb9a9a8950b2282704ea75

    SHA256

    8913e8293ff88f3c8aea171bb730828a2dbe334cd83f5ec94881d936d6749997

    SHA512

    8f32b664a8e8ac14d5e1f2402899bc4457978bb4d4c76d86eeea4a12c411f3c3327ad3e12a763351c6f09d4e916cfac319aa104fd4c717851ff46028f9615fd5

  • C:\Users\Admin\AppData\Local\Temp\ilzz7njItouhIyD.exe

    Filesize

    64KB

    MD5

    ae6ce17005c63b7e9bf15a2a21abb315

    SHA1

    9b6bdfb9d648fa422f54ec07b8c8ea70389c09eb

    SHA256

    4a3387a54eeca83f3a8ff1f5f282f7966c9e7bfe159c8eb45444cab01b3e167e

    SHA512

    c883a5f599540d636efc8c0abc05aab7bad0aa1b10ab507f43f18e0fba905a10b94ff2f1ba10ae0fee15cc1b90a165a768dc078fda0ac27474f0eef66f6a11af

  • C:\Windows\CTS.exe

    Filesize

    71KB

    MD5

    66df4ffab62e674af2e75b163563fc0b

    SHA1

    dec8a197312e41eeb3cfef01cb2a443f0205cd6e

    SHA256

    075a6eecd8da1795532318f9cf880efe42461f9464d63f74deb271d33110f163

    SHA512

    1588dd78e6e8972013c40cdb6acfb84c8df7b081197233ce621904b645356c805d0424bb93dd46c55834dc47d9ff39ee1323cf8e670841b3fff24ab98ba87f25