Analysis

  • max time kernel
    144s
  • max time network
    148s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240419-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240419-enlocale:en-usos:windows10-2004-x64system
  • submitted
    04-05-2024 11:53

General

  • Target

    Microsoft_Upgrade.exe

  • Size

    637KB

  • MD5

    c966dbcfcfd2b34349b69a64ca2d84b2

  • SHA1

    a38239f0c1b582eb703a8a51c67894559cbddc17

  • SHA256

    f7f198c7576f5b5445c13bc91959541534f1412cbadca9a33c929731f594514c

  • SHA512

    e7e4ffa5c49f83b1b93f2ccf65d5a2d762c25368babaac73317121873a5ce95e342a842dbe60a00a2005b920acdc8f3ed5b570b478a0dfd23b3743757a04ff3c

  • SSDEEP

    12288:FYV6MorX7qzuC3QHO9FQVHPF51jgcaI8j9r66W6NYRC/wvL71fic:6BXu9HGaVHaI8j9m6W6NYA8pB

Malware Config

Extracted

Family

nanocore

Version

1.2.2.0

C2

54111.duckdns.org:54111

127.0.0.1:54111

Mutex

cfac1586-e1cf-4d97-b493-5e7e1dd40a32

Attributes
  • activate_away_mode

    true

  • backup_connection_host

    127.0.0.1

  • backup_dns_server

    8.8.4.4

  • buffer_size

    65535

  • build_time

    2019-02-12T06:39:37.387793036Z

  • bypass_user_account_control

    true

  • bypass_user_account_control_data

  • clear_access_control

    true

  • clear_zone_identifier

    false

  • connect_delay

    4000

  • connection_port

    54111

  • 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

    cfac1586-e1cf-4d97-b493-5e7e1dd40a32

  • mutex_timeout

    5000

  • prevent_system_sleep

    false

  • primary_connection_host

    54111.duckdns.org

  • primary_dns_server

    8.8.8.8

  • request_elevation

    true

  • restart_delay

    5000

  • run_delay

    0

  • run_on_startup

    true

  • set_critical_process

    true

  • timeout_interval

    5000

  • use_custom_dns_server

    false

  • version

    1.2.2.0

  • wan_timeout

    8000

Signatures

  • 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.

  • UPX packed file 2 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • AutoIT Executable 1 IoCs

    AutoIT scripts compiled to PE executables.

  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Delays execution with timeout.exe 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 3 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of FindShellTrayWindow 3 IoCs
  • Suspicious use of SendNotifyMessage 3 IoCs
  • Suspicious use of WriteProcessMemory 11 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Microsoft_Upgrade.exe
    "C:\Users\Admin\AppData\Local\Temp\Microsoft_Upgrade.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of SetThreadContext
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    • Suspicious use of WriteProcessMemory
    PID:4368
    • C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe
      "C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe"
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of AdjustPrivilegeToken
      PID:4748
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c TimeOut 1 & Del /F "C:\Users\Admin\AppData\Local\Temp\Microsoft_Upgrade.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3464
      • C:\Windows\SysWOW64\timeout.exe
        TimeOut 1
        3⤵
        • Delays execution with timeout.exe
        PID:3800

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

  • memory/4368-0-0x0000000000DE0000-0x0000000000F4B000-memory.dmp

    Filesize

    1.4MB

  • memory/4368-6-0x0000000000F60000-0x0000000000F61000-memory.dmp

    Filesize

    4KB

  • memory/4368-9-0x0000000000DE0000-0x0000000000F4B000-memory.dmp

    Filesize

    1.4MB

  • memory/4748-1-0x0000000000400000-0x0000000000438000-memory.dmp

    Filesize

    224KB

  • memory/4748-7-0x0000000073332000-0x0000000073333000-memory.dmp

    Filesize

    4KB

  • memory/4748-10-0x0000000073330000-0x00000000738E1000-memory.dmp

    Filesize

    5.7MB

  • memory/4748-11-0x0000000073330000-0x00000000738E1000-memory.dmp

    Filesize

    5.7MB

  • memory/4748-13-0x0000000073330000-0x00000000738E1000-memory.dmp

    Filesize

    5.7MB

  • memory/4748-14-0x0000000073332000-0x0000000073333000-memory.dmp

    Filesize

    4KB

  • memory/4748-15-0x0000000073330000-0x00000000738E1000-memory.dmp

    Filesize

    5.7MB

  • memory/4748-16-0x0000000073330000-0x00000000738E1000-memory.dmp

    Filesize

    5.7MB