Analysis

  • max time kernel
    149s
  • max time network
    205s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    26/11/2022, 23:00

General

  • Target

    IMG_88967569.exe

  • Size

    247KB

  • MD5

    9deae9ea695e8e5fdab35294f848e6b2

  • SHA1

    73314c20de4b46a6ddb5c9b224e22c1c20ef0183

  • SHA256

    38e14f1ab8dab71a76cbbc260d5c43d41023f2b23e8955f29dc81213454660f2

  • SHA512

    89b70646c7789b81c029829a47888b93af8033b92665104e0513446b4ca08fb3e04579480a5d00ef50817104742ff747b20c0b03f9ab82d6c8cf5738bf369d76

  • SSDEEP

    6144:6HVBccB9DtCftfZSmijPZtWVbOV9s2W4A375ySgMz0TRn4w:orybOV9ssi5NgM4T

Malware Config

Extracted

Family

nanocore

Version

1.2.0.0

C2

informer.ddns.net:9033

Mutex

f26b04ec-d813-46f5-a7c2-6b8110394025

Attributes
  • activate_away_mode

    true

  • backup_connection_host

    informer.ddns.net

  • backup_dns_server

  • buffer_size

    65535

  • build_time

    2014-08-13T12:19:06.373609236Z

  • bypass_user_account_control

    true

  • bypass_user_account_control_data

  • clear_access_control

    true

  • clear_zone_identifier

    false

  • connect_delay

    4000

  • connection_port

    9033

  • default_group

    Default

  • enable_debug_mode

    true

  • gc_threshold

    1.048576e+07

  • keep_alive_timeout

    30000

  • keyboard_logging

    false

  • lan_timeout

    2500

  • max_packet_size

    1.048576e+07

  • mutex

    f26b04ec-d813-46f5-a7c2-6b8110394025

  • mutex_timeout

    5000

  • prevent_system_sleep

    false

  • primary_connection_host

    informer.ddns.net

  • primary_dns_server

  • request_elevation

    true

  • restart_delay

    5000

  • run_delay

    0

  • run_on_startup

    false

  • set_critical_process

    true

  • timeout_interval

    5000

  • use_custom_dns_server

    false

  • version

    1.2.0.0

  • wan_timeout

    8000

Signatures

  • Modifies WinLogon for persistence 2 TTPs 1 IoCs
  • NanoCore

    NanoCore is a remote access tool (RAT) with a variety of capabilities.

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Adds Run key to start application 2 TTPs 1 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Drops file in Program Files directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious behavior: EnumeratesProcesses 5 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 14 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\IMG_88967569.exe
    "C:\Users\Admin\AppData\Local\Temp\IMG_88967569.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4600
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\system32\cmd.exe" /c reg add "HKCU\Software\Microsoft\Windows NT\CurrentVersion\Winlogon" /f /v shell /t REG_SZ /d "C:\Users\Admin\AppData\Roaming\x4c6lpG5\MGDvRNf.exe,explorer.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3716
      • C:\Windows\SysWOW64\reg.exe
        reg add "HKCU\Software\Microsoft\Windows NT\CurrentVersion\Winlogon" /f /v shell /t REG_SZ /d "C:\Users\Admin\AppData\Roaming\x4c6lpG5\MGDvRNf.exe,explorer.exe"
        3⤵
        • Modifies WinLogon for persistence
        PID:4424
    • C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe
      "C:\Windows\Microsoft.NET\Framework\v2.0.50727\MSBuild.exe"
      2⤵
      • Adds Run key to start application
      • Drops file in Program Files directory
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of AdjustPrivilegeToken
      PID:4008

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • memory/4008-137-0x0000000000400000-0x0000000000436000-memory.dmp

          Filesize

          216KB

        • memory/4008-139-0x0000000074E50000-0x0000000075401000-memory.dmp

          Filesize

          5.7MB

        • memory/4008-140-0x0000000074E50000-0x0000000075401000-memory.dmp

          Filesize

          5.7MB

        • memory/4600-132-0x0000000074E50000-0x0000000075401000-memory.dmp

          Filesize

          5.7MB

        • memory/4600-133-0x0000000074E50000-0x0000000075401000-memory.dmp

          Filesize

          5.7MB

        • memory/4600-138-0x0000000074E50000-0x0000000075401000-memory.dmp

          Filesize

          5.7MB