Analysis

  • max time kernel
    147s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    14/11/2022, 18:46

General

  • Target

    85605a584d908e5a32d91767940f7aab.exe

  • Size

    907KB

  • MD5

    85605a584d908e5a32d91767940f7aab

  • SHA1

    4568b524b21c8cea9ae297ab782ac95a33a61e59

  • SHA256

    3f0a89e3647d4ff575fc0c8db1ea5e9f7dbf2c0041f90ec2ef26c7eab69b34f8

  • SHA512

    a43af329a798947bc8b2473436de1092f51b3ac23f0f562c59c4b263216d00d6a9b39b4e3a4255d00cb7dfaebcb26563be5df321b0f4d049071ec90c5cfd156e

  • SSDEEP

    12288:sANiU251k3btMOKdeyqo6x+UXndim70h+qrDMJ65AqQR1I9tWAlEsZqxJU2V8:sAToEhMVioctP70h+r0yqEspVqk2W

Malware Config

Extracted

Family

nanocore

Version

1.2.2.0

C2

maxlogs.webhop.me:1620

Mutex

9d764268-05c2-4a8e-8c39-b4db356d4640

Attributes
  • activate_away_mode

    true

  • backup_connection_host

  • backup_dns_server

    8.8.4.4

  • buffer_size

    65535

  • build_time

    2020-05-29T07:34:04.203922136Z

  • bypass_user_account_control

    true

  • bypass_user_account_control_data

  • clear_access_control

    true

  • clear_zone_identifier

    false

  • connect_delay

    4000

  • connection_port

    1620

  • default_group

    x

  • 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

    9d764268-05c2-4a8e-8c39-b4db356d4640

  • mutex_timeout

    5000

  • prevent_system_sleep

    false

  • primary_connection_host

    maxlogs.webhop.me

  • primary_dns_server

    8.8.8.8

  • 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

    1.2.2.0

  • 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.

  • 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.

  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 11 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\85605a584d908e5a32d91767940f7aab.exe
    "C:\Users\Admin\AppData\Local\Temp\85605a584d908e5a32d91767940f7aab.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2696
    • C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\TztnPxRQQq" /XML "C:\Users\Admin\AppData\Local\Temp\tmp271F.tmp"
      2⤵
      • Creates scheduled task(s)
      PID:1920
    • C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
      "{path}"
      2⤵
      • Adds Run key to start application
      • Drops file in Program Files directory
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of AdjustPrivilegeToken
      PID:4624

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        • C:\Users\Admin\AppData\Local\Temp\tmp271F.tmp

          Filesize

          1KB

          MD5

          ae2fa56e63450ec6f0ec73354ed5107c

          SHA1

          334f269e184f8d76f8b4fdba70e7c4c853af5943

          SHA256

          abc08be05a8132aa8e151a04d53621bd3e4a0bfe395f8bd97c4598d0bb28bf60

          SHA512

          a5d2df15877f1d5c92c5090d46931814e169b0f9e47e22aaf86b70c48972f5ac85fffafc83448b4ed7664cd9a41c177a8f110aa01fd159bdb705b357c8b3715b

        • memory/2696-132-0x0000000000440000-0x000000000052A000-memory.dmp

          Filesize

          936KB

        • memory/2696-133-0x0000000005450000-0x00000000059F4000-memory.dmp

          Filesize

          5.6MB

        • memory/2696-134-0x0000000004F40000-0x0000000004FD2000-memory.dmp

          Filesize

          584KB

        • memory/2696-135-0x0000000004FE0000-0x000000000507C000-memory.dmp

          Filesize

          624KB

        • memory/2696-136-0x0000000004ED0000-0x0000000004EDA000-memory.dmp

          Filesize

          40KB

        • memory/4624-140-0x0000000000400000-0x0000000000438000-memory.dmp

          Filesize

          224KB