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Analysis

  • max time kernel
    55s
  • max time network
    44s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240419-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240419-enlocale:en-usos:windows10-2004-x64system
  • submitted
    27/04/2024, 02:25

General

  • Target

    2024-04-27_4c7d38c93eb3c020d71179e181754db2_bkransomware.exe

  • Size

    96KB

  • MD5

    4c7d38c93eb3c020d71179e181754db2

  • SHA1

    b5eba26d8a8b5f94deb16e01cb593860e3fac1b1

  • SHA256

    3bf46103a7fffa809235aa999a497c12c11f0b198237216999198c13743c4efd

  • SHA512

    56d1e429f8a982910b519bfd758b9fea1aa2fc9230208518dde949e2d3cd4dcbe78830869ed5558eb2cc69ab30325104b6ad992c52dd21ae06da59f886c39603

  • SSDEEP

    1536:Fc8N7UsWjcd9w+AyabjDbxE+MwmvlzuazT3lEFGg3YZSCCbVa:ZRpAyazIliazTVEFGgoZfCbQ

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\2024-04-27_4c7d38c93eb3c020d71179e181754db2_bkransomware.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-04-27_4c7d38c93eb3c020d71179e181754db2_bkransomware.exe"
    1⤵
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1576
    • C:\Users\Admin\AppData\Local\Temp\xMu4oNIgGBQQUDm.exe
      C:\Users\Admin\AppData\Local\Temp\xMu4oNIgGBQQUDm.exe
      2⤵
      • Executes dropped EXE
      PID:932
    • 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:4592

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

    395KB

    MD5

    4afc3f86653225d5b80a771acaded4a0

    SHA1

    ca46447164bff29594494dec898741a95c6b27bc

    SHA256

    068e86044595ec6e334daf648acc802e6d8e8586cab6131154bb362c4441b79d

    SHA512

    0b6df954e0ef0a79636a17e5aff984c9aa84b0ed9026ca54d9ba763005b9241e5cb5b3e8926e601aff8dcaa91e44f10f88089232782e742a4575843009f4a56d

  • C:\Users\Admin\AppData\Local\Temp\xMu4oNIgGBQQUDm.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/932-10-0x0000000000400000-0x000000000040D000-memory.dmp

    Filesize

    52KB