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Analysis

  • max time kernel
    150s
  • max time network
    147s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05/06/2023, 10:30

General

  • Target

    TSD.exe

  • Size

    649KB

  • MD5

    2574234ccd8503284e9d4d910e39e132

  • SHA1

    aa7943ef2c8979d4daf653b056649a5dff0718c0

  • SHA256

    8be47965011a00d57e60ab3b16c89fabb9cfc3b4e9330044853711fa4166617c

  • SHA512

    e9ac30e44040e375f1394a2b8ab8a8c113b1e94119d328e2730e85c1b5a2bf3ac731f91dc68eca4cae8722109b04193f228fc0433e40bc57fadc6fc78ecdcbe7

  • SSDEEP

    12288:B6UaeOpx41/an46A9jmP/uhu/yMS08CkntxYRML:kLeza4fmP/UDMS08Ckn3z

Malware Config

Extracted

Family

kutaki

C2

http://linkwotowoto.club/new/two.php

Signatures

  • Kutaki

    Information stealer and keylogger that hides inside legitimate Visual Basic applications.

  • Kutaki Executable 2 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Drops startup file 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in Windows directory 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of SetWindowsHookEx 10 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\TSD.exe
    "C:\Users\Admin\AppData\Local\Temp\TSD.exe"
    1⤵
    • Drops startup file
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:5088
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /c C:\Users\Admin\AppData\Local\Temp\NewBitmapimage.bmp
      2⤵
      • Checks computer location settings
      • Modifies registry class
      • Suspicious use of WriteProcessMemory
      PID:2356
      • C:\Windows\SysWOW64\mspaint.exe
        "C:\Windows\system32\mspaint.exe" "C:\Users\Admin\AppData\Local\Temp\NewBitmapimage.bmp"
        3⤵
        • Drops file in Windows directory
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of SetWindowsHookEx
        PID:3912
    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\bkogkifk.exe
      "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\bkogkifk.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of SetWindowsHookEx
      PID:4184
  • C:\Windows\system32\svchost.exe
    C:\Windows\system32\svchost.exe -k LocalSystemNetworkRestricted -p -s DeviceAssociationService
    1⤵
      PID:4116

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\bkogkifk.exe

      Filesize

      649KB

      MD5

      2574234ccd8503284e9d4d910e39e132

      SHA1

      aa7943ef2c8979d4daf653b056649a5dff0718c0

      SHA256

      8be47965011a00d57e60ab3b16c89fabb9cfc3b4e9330044853711fa4166617c

      SHA512

      e9ac30e44040e375f1394a2b8ab8a8c113b1e94119d328e2730e85c1b5a2bf3ac731f91dc68eca4cae8722109b04193f228fc0433e40bc57fadc6fc78ecdcbe7

    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\bkogkifk.exe

      Filesize

      649KB

      MD5

      2574234ccd8503284e9d4d910e39e132

      SHA1

      aa7943ef2c8979d4daf653b056649a5dff0718c0

      SHA256

      8be47965011a00d57e60ab3b16c89fabb9cfc3b4e9330044853711fa4166617c

      SHA512

      e9ac30e44040e375f1394a2b8ab8a8c113b1e94119d328e2730e85c1b5a2bf3ac731f91dc68eca4cae8722109b04193f228fc0433e40bc57fadc6fc78ecdcbe7