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Analysis

  • max time kernel
    139s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231023-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231023-enlocale:en-usos:windows10-2004-x64system
  • submitted
    16/11/2023, 22:21

General

  • Target

    Logon_overwriter.exe

  • Size

    266KB

  • MD5

    08d52877fd68e4de576b54515330a900

  • SHA1

    2404b3245e591b3e55badd8addf78f18ae8ff3b7

  • SHA256

    1f934e5ee7286e177226e282041c445cd88060032edb4f2ff0cd9a10c26b0722

  • SHA512

    3164c40f644a6bd4c955a66e83ac0dc84780963c97aa7001dc734b8e2e0579bb768de0820465ca6fed6b89ce19897b44dc30d072663ac9bdda59d35ea14b2cf1

  • SSDEEP

    6144:pbpdyCIzMEZ4DQ0SsG4+7WO7WfdyCIzMEZ4DQ0SsG4Nq:glzMKwKaOaIlzMKwQ

Score
8/10

Malware Config

Signatures

  • Possible privilege escalation attempt 2 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Modifies file permissions 1 TTPs 2 IoCs
  • Drops file in System32 directory 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 6 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Logon_overwriter.exe
    "C:\Users\Admin\AppData\Local\Temp\Logon_overwriter.exe"
    1⤵
    • Checks computer location settings
    • Drops file in System32 directory
    • Suspicious use of WriteProcessMemory
    PID:3908
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32 && icacls C:\Windows\System32 /grant "%username%:F"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3548
      • C:\Windows\system32\takeown.exe
        takeown /f C:\Windows\System32
        3⤵
        • Possible privilege escalation attempt
        • Modifies file permissions
        • Suspicious use of AdjustPrivilegeToken
        PID:5032
      • C:\Windows\system32\icacls.exe
        icacls C:\Windows\System32 /grant "Admin:F"
        3⤵
        • Possible privilege escalation attempt
        • Modifies file permissions
        PID:720

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • memory/3908-0-0x000001C6BFAA0000-0x000001C6BFAE8000-memory.dmp

    Filesize

    288KB

  • memory/3908-1-0x00007FF94F3F0000-0x00007FF94FEB1000-memory.dmp

    Filesize

    10.8MB

  • memory/3908-2-0x000001C6D9F80000-0x000001C6D9F90000-memory.dmp

    Filesize

    64KB

  • memory/3908-3-0x00007FF94F3F0000-0x00007FF94FEB1000-memory.dmp

    Filesize

    10.8MB

  • memory/3908-4-0x000001C6D9F80000-0x000001C6D9F90000-memory.dmp

    Filesize

    64KB

  • memory/3908-7-0x00007FF94F3F0000-0x00007FF94FEB1000-memory.dmp

    Filesize

    10.8MB