Analysis

  • max time kernel
    158s
  • max time network
    137s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-en-20220113
  • submitted
    01-02-2022 02:43

General

  • Target

    Tax Payment Challan.exe

  • Size

    816KB

  • MD5

    7179c01d287ea46e21056c636762968e

  • SHA1

    a415e62ffb1aa36634d5829e4860440f98623358

  • SHA256

    c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9

  • SHA512

    875034e75889847861f603afada2ea5a7ebc1058e84dea5759dd8528055ad48cfd2b64bca3109721ccc2a16f171b8368649603955d69583380ec1400e5b34dfc

Malware Config

Signatures

  • Kutaki

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

  • Kutaki Executable 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Sets service image path in registry 2 TTPs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Drops startup file 2 IoCs
  • Maps connected drives based on registry 3 TTPs 2 IoCs

    Disk information is often read in order to detect sandboxing environments.

  • Drops file in Windows directory 7 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Checks SCSI registry key(s) 3 TTPs 64 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Modifies data under HKEY_USERS 42 IoCs
  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 6 IoCs
  • Suspicious use of SetWindowsHookEx 10 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Tax Payment Challan.exe
    "C:\Users\Admin\AppData\Local\Temp\Tax Payment Challan.exe"
    1⤵
    • Drops startup file
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:1452
    • 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:1900
      • 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:4300
    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\zpdaedch.exe
      "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\zpdaedch.exe"
      2⤵
      • Executes dropped EXE
      • Maps connected drives based on registry
      • Suspicious use of SetWindowsHookEx
      PID:4340
  • C:\Windows\system32\svchost.exe
    C:\Windows\system32\svchost.exe -k LocalSystemNetworkRestricted -p -s DeviceAssociationService
    1⤵
      PID:4368
    • C:\Windows\system32\svchost.exe
      C:\Windows\system32\svchost.exe -k netsvcs -p -s DsmSvc
      1⤵
      • Checks SCSI registry key(s)
      • Modifies data under HKEY_USERS
      PID:1284
    • C:\Windows\System32\WaaSMedicAgent.exe
      C:\Windows\System32\WaaSMedicAgent.exe 90cf196b48b353a283c31c8b4fca611c 1fdQnVobK0qyVMPn6tDdsw.0.1.0.0.0
      1⤵
      • Modifies data under HKEY_USERS
      PID:3028
    • C:\Windows\system32\svchost.exe
      C:\Windows\system32\svchost.exe -k netsvcs -p -s wuauserv
      1⤵
      • Drops file in Windows directory
      • Suspicious use of AdjustPrivilegeToken
      PID:3976

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

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    Downloads

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

      MD5

      7179c01d287ea46e21056c636762968e

      SHA1

      a415e62ffb1aa36634d5829e4860440f98623358

      SHA256

      c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9

      SHA512

      875034e75889847861f603afada2ea5a7ebc1058e84dea5759dd8528055ad48cfd2b64bca3109721ccc2a16f171b8368649603955d69583380ec1400e5b34dfc

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

      MD5

      7179c01d287ea46e21056c636762968e

      SHA1

      a415e62ffb1aa36634d5829e4860440f98623358

      SHA256

      c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9

      SHA512

      875034e75889847861f603afada2ea5a7ebc1058e84dea5759dd8528055ad48cfd2b64bca3109721ccc2a16f171b8368649603955d69583380ec1400e5b34dfc

    • memory/3976-134-0x0000019688B30000-0x0000019688B40000-memory.dmp

      Filesize

      64KB

    • memory/3976-135-0x0000019688B90000-0x0000019688BA0000-memory.dmp

      Filesize

      64KB

    • memory/3976-136-0x000001968B8A0000-0x000001968B8A4000-memory.dmp

      Filesize

      16KB