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Analysis

  • max time kernel
    93s
  • max time network
    95s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240426-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03/05/2024, 10:28

General

  • Target

    2024-05-03_905f2311a180ec3bce2aa7e517c2c671_bkransomware.exe

  • Size

    135KB

  • MD5

    905f2311a180ec3bce2aa7e517c2c671

  • SHA1

    48d8ea911d0fc45143df8efc2b0c17e72bab3d17

  • SHA256

    237cd66950f0ea22643de353894a495688ba574355a8156f9fc5ed3a26e5e6c1

  • SHA512

    2cfe78d9af5e31117077c586d398f2fe01d1c69a30adcc5d62c052dcff6599c8f8dae3b226a146f6f175a276ffd4d29ef640daecbc5cad79f41749ab375ea7b2

  • SSDEEP

    3072:ZhpAyazIlyazTL5L/2eKFhhH47GCzp0uqUOPF:hZMaz1TePnCzKJPF

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\2024-05-03_905f2311a180ec3bce2aa7e517c2c671_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-05-03_905f2311a180ec3bce2aa7e517c2c671_bkransomware.exe"
    1⤵
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4388
    • C:\Users\Admin\AppData\Local\Temp\Fi2K9GlprHERtLm.exe
      C:\Users\Admin\AppData\Local\Temp\Fi2K9GlprHERtLm.exe
      2⤵
      • Executes dropped EXE
      PID:5004
    • 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:856

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

    696c735b822b2caec4e9e4b4389a64ba

    SHA1

    b03c443cca9d14320ece255c71751ac5c61d83e0

    SHA256

    a5f94b9443f76983914c843da5ecd3377f79ed75e4410d17f04d36d9b4229878

    SHA512

    d81439814db951b444fffc7e23e84f1ae0a76b5e3f19b6ead4c15909e7f74f90043720d6d1d6718415766468db4532e0a6d74bcd9503480dfd82bba2d0815296

  • C:\Users\Admin\AppData\Local\Temp\Fi2K9GlprHERtLm.exe

    Filesize

    64KB

    MD5

    a32a382b8a5a906e03a83b4f3e5b7a9b

    SHA1

    11e2bdd0798761f93cce363329996af6c17ed796

    SHA256

    75f12ea2f30d9c0d872dade345f30f562e6d93847b6a509ba53beec6d0b2c346

    SHA512

    ec87dd957be21b135212454646dcabdd7ef9442cf714e2c1f6b42b81f0c3fa3b1875bde9a8b538e8a0aa2190225649c29e9ed0f25176e7659e55e422dd4efe4c

  • C:\Windows\CTS.exe

    Filesize

    71KB

    MD5

    66df4ffab62e674af2e75b163563fc0b

    SHA1

    dec8a197312e41eeb3cfef01cb2a443f0205cd6e

    SHA256

    075a6eecd8da1795532318f9cf880efe42461f9464d63f74deb271d33110f163

    SHA512

    1588dd78e6e8972013c40cdb6acfb84c8df7b081197233ce621904b645356c805d0424bb93dd46c55834dc47d9ff39ee1323cf8e670841b3fff24ab98ba87f25