General

  • Target

    WinOptimizer.18.00.18.Portable.exe

  • Size

    22.6MB

  • Sample

    211106-xc9jgsfba5

  • MD5

    1039e3867fa26e4e38c3a7fafbeb9013

  • SHA1

    6dc045db152ab59be6e3bb5fa28a3adeea1cb06c

  • SHA256

    a7521b44c71baaaa5ac4c74b1918196713fee07470a48cbd27b2c46142375154

  • SHA512

    448ef4504a2202bf0f86fc2a3345d61c53465a96c8a9c6f773475719b1b4e723241bb6bd673b416337891598f910f9e6fc9bf4fe5925bca9981d58550699b45c

Malware Config

Extracted

Family

nanocore

Version

1.2.2.0

C2

pettbull.ddns.net:53896

127.0.0.1:53896

Mutex

5bb33a25-3661-40a6-bf27-e3cf4c873773

Attributes
  • activate_away_mode

    false

  • backup_connection_host

    127.0.0.1

  • backup_dns_server

    8.8.4.4

  • buffer_size

    65535

  • build_time

    2020-12-19T09:35:29.334939436Z

  • bypass_user_account_control

    true

  • bypass_user_account_control_data

  • clear_access_control

    true

  • clear_zone_identifier

    false

  • connect_delay

    4000

  • connection_port

    53896

  • default_group

    MIX221

  • 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

    5bb33a25-3661-40a6-bf27-e3cf4c873773

  • mutex_timeout

    5000

  • prevent_system_sleep

    false

  • primary_connection_host

    pettbull.ddns.net

  • 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

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

MIXONE

C2

pettbull.ddns.net:6606

pettbull.ddns.net:7707

pettbull.ddns.net:8808

Mutex

AsyncMutex_6SI8OkPnk

Attributes
  • anti_vm

    false

  • bsod

    false

  • delay

    3

  • install

    true

  • install_file

    Windows Microsoft.exe

  • install_folder

    %AppData%

  • pastebin_config

    null

aes.plain

Extracted

Family

quasar

Version

1.4.0

Botnet

MIX21

C2

pettbull.ddns.net:4782

Mutex

69383ffd-4823-44c2-b21f-a105f85ed9a0

Attributes
  • encryption_key

    DAE9E02E5E04D59D9AF2AA1D5E82248D5919AC6A

  • install_name

    Windows Service.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Microsoft Windows

  • subdirectory

    Windows Update

Targets

    • Target

      CFB1EE668FC3E25580C334AB753749D2EF5A44AB9BE1E033047345827696CBF8

    • Size

      22.7MB

    • MD5

      55287c8aa442a3f521aabb6a80b3f6a8

    • SHA1

      5e9c38e66448c4c1b8066b04987eb62cf6f48763

    • SHA256

      cfb1ee668fc3e25580c334ab753749d2ef5a44ab9be1e033047345827696cbf8

    • SHA512

      2d265bb941c28944ae7a25dea43d6122e04e549d349fc8276670683926feac52b12d3de42b0601d134f3842641b28751a62c8ddc28e3a3140f2041dfdf629813

    • AsyncRat

      AsyncRAT is designed to remotely monitor and control other computers.

    • Detect Neshta Payload

    • NanoCore

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

    • Neshta

      Malware from the neshta family is designed to infect itself into other files to spread itself and cause damage.

    • Quasar Payload

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

    • Async RAT payload

    • Executes dropped EXE

    • Checks computer location settings

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

    • Loads dropped DLL

    • Adds Run key to start application

    • Checks installed software on the system

      Looks up Uninstall key entries in the registry to enumerate software on the system.

    • Checks whether UAC is enabled

    • Enumerates connected drives

      Attempts to read the root path of hard drives other than the default C: drive.

    • Maps connected drives based on registry

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

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v6

Tasks