General

  • Target

    Ref02812041077pdf.z

  • Size

    2.0MB

  • Sample

    221026-skea4agbcr

  • MD5

    b57e2db9c5c15e3032e8b819e8bfc50f

  • SHA1

    6fa28a2df5091675ea62faa99de5729d4b151cfd

  • SHA256

    4ae6e1c16ea100c53ac02ad5ca9c2f32ce28424c790a421ed5095d5ff8ac6908

  • SHA512

    7b3c5b9b33a2707dd51c9a9a9ba9251bd1f5b6158f80951b92c063d16521d5d31ecf9a4a9c64ec4edd84297fd3443a1b1012802fdf6a84eb5440e3e676d5dffa

  • SSDEEP

    49152:HEcMngX+5OkpOp/Z+hBeKN6Ypvgtstzdn23bhBCZ:AZDop/Z+hBdN6iNldn29cZ

Malware Config

Extracted

Family

nanocore

Version

1.2.2.0

C2

rze6.sytes.net:8000

Mutex

0aeffa29-f3e3-4c27-b5c4-5ee7e27a451f

Attributes
  • activate_away_mode

    true

  • backup_connection_host

  • backup_dns_server

    8.8.4.4

  • buffer_size

    65535

  • build_time

    2022-07-19T10:27:50.574421636Z

  • bypass_user_account_control

    true

  • bypass_user_account_control_data

  • clear_access_control

    true

  • clear_zone_identifier

    false

  • connect_delay

    4000

  • connection_port

    8000

  • default_group

    OCT

  • 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

    0aeffa29-f3e3-4c27-b5c4-5ee7e27a451f

  • mutex_timeout

    5000

  • prevent_system_sleep

    false

  • primary_connection_host

    rze6.sytes.net

  • 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

Extracted

Family

agenttesla

C2

http://195.178.120.72/ch1t/inc/c20966a2dd74ab.php

Targets

    • Target

      Ref02812041077.exe

    • Size

      2.1MB

    • MD5

      9fa9b26c4cd53dac25384bdcc23eb78e

    • SHA1

      90990676b8af8e355aef96951afd9e0ad8fbe4f8

    • SHA256

      caee2b09afaf3f24a972b3e8031b89088c68574541d115ab992a172a01d138f6

    • SHA512

      901e6ee9a81f6bc83f618b6ecb0b539dcb3cf1d1fdb5cfdfd9c5cc3e772580dc5ef4e8b59218c161f07171c7d1cbb70cfa69b7caa03a45429d05977d3112226f

    • SSDEEP

      49152:pN5rOMtg7+5O8g1x9+7W6Xl5qqTg0lvgtsfzdj2RJhrdU:p7rPDg1x9R6Xl53TgIH7dj25hU

    • AgentTesla

      Agent Tesla is a remote access tool (RAT) written in visual basic.

    • NanoCore

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

    • Executes dropped EXE

    • Checks computer location settings

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

    • Drops startup file

    • Loads dropped DLL

    • Reads data files stored by FTP clients

      Tries to access configuration files associated with programs like FileZilla.

    • Reads user/profile data of local email clients

      Email clients store some user data on disk where infostealers will often target it.

    • Reads user/profile data of web browsers

      Infostealers often target stored browser data, which can include saved credentials etc.

    • Accesses Microsoft Outlook profiles

    • Adds Run key to start application

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v6

Tasks