Overview

overview

10

Static

static

img_0928211.exe

windows7-x64

10

img_0928211.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    26/11/2022, 23:55

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General

  • Target
    img_0928211.exe
  • Size 921KB
  • Sample221126-3ylmfaeb23
  • SHA256 fe5439378961e964d35e1e079c5675111def39ec03f5e87db38132313a618a2f
  • MD5 SHA1 SHA512 SSDEEP
Score
10/10
nanocoreevasionkeyloggerpersistencespywarestealertrojan

Malware Config

Extracted

Family

  • nanocore

Version

  • 1.2.1.1

C2

  • nattyma.no-ip.biz:9035

Mutex

  • 45d17d9c-c36c-4d6f-93b8-abc9b59cd8a6

Attributes
  • activate_away_mode

    true

  • backup_connection_host

    nattyma.no-ip.biz

  • backup_dns_server

  • buffer_size

    65535

  • build_time

    2014-09-28T06:15:02.698339236Z

  • bypass_user_account_control

    true

  • bypass_user_account_control_data

  • clear_access_control

    true

  • clear_zone_identifier

    true

  • connect_delay

    4000

  • connection_port

    9035

  • default_group

    NEROSMART

  • enable_debug_mode

    true

  • gc_threshold

    1.0448576e+08

  • keep_alive_timeout

    30000

  • keyboard_logging

    false

  • lan_timeout

    2500

  • max_packet_size

    9.9948576e+08

  • mutex

    45d17d9c-c36c-4d6f-93b8-abc9b59cd8a6

  • mutex_timeout

    5000

  • prevent_system_sleep

    false

  • primary_connection_host

    nattyma.no-ip.biz

  • 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

    1.2.1.1

  • wan_timeout

    8000

Signatures

  • Modifies visiblity of hidden/system files in Explorer 2 TTPs 2 IoCs
    evasion
  • NanoCore

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

    keyloggertrojanstealerspywarenanocore
  • Executes dropped EXE 2 IoCs
  • Checks computer location settings 2 TTPs 3 IoCs

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

  • Adds Run key to start application 2 TTPs 5 IoCs
    persistence
  • Checks whether UAC is enabled 1 TTPs 2 IoCs
    evasiontrojan
  • Suspicious use of SetThreadContext 2 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.

  • Program crash 1 IoCs
  • Modifies registry class 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 21 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\img_0928211.exe
    "C:\Users\Admin\AppData\Local\Temp\img_0928211.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4788
    • C:\Users\Admin\99o623u41dw\gfcbk.exe
      "C:\Users\Admin\99o623u41dw\gfcbk.exe" arjegv
      2⤵
      • Modifies visiblity of hidden/system files in Explorer
      • Executes dropped EXE
      • Checks computer location settings
      • Adds Run key to start application
      • Checks whether UAC is enabled
      • Suspicious use of SetThreadContext
      • Modifies registry class
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1656
      • C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe
        "C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe"
        3⤵
          PID:1660
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1660 -s 80
            4⤵
            • Program crash
            PID:4052
        • C:\Windows\SysWOW64\WScript.exe
          "C:\Windows\System32\WScript.exe" "C:\Users\Admin\99O623~1\run.vbs"
          3⤵
          • Checks computer location settings
          • Modifies registry class
          • Suspicious use of WriteProcessMemory
          PID:4312
          • C:\Users\Admin\99o623u41dw\gfcbk.exe
            "C:\Users\Admin\99o623u41dw\gfcbk.exe" arjegv
            4⤵
            • Modifies visiblity of hidden/system files in Explorer
            • Executes dropped EXE
            • Adds Run key to start application
            • Checks whether UAC is enabled
            • Suspicious use of SetThreadContext
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of WriteProcessMemory
            PID:3540
            • C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe
              "C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe"
              5⤵
              • Adds Run key to start application
              • Drops file in Program Files directory
              • Suspicious behavior: GetForegroundWindowSpam
              • Suspicious use of AdjustPrivilegeToken
              PID:1580
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 360 -p 1660 -ip 1660
      1⤵
        PID:4356

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            KXKRZT~1.JKD
            • Path C:\Users\Admin\99O623~1\KXKRZT~1.JKD
            • Size 204KB
            • SHA256 09eaa6dc4de1fac152662f4a2b50e724a7835b3c7883c3cd41fb67ee1e1fe04d
            • MD5 SHA1 SHA512 SSDEEP
            Submit Download

            piuqnjuz.NZW
            • Path C:\Users\Admin\99O623~1\piuqnjuz.NZW
            • Size 200B
            • SHA256 ec00d718336b97497192c9b919e1a3704db4e2bfdef7ddcf69abddf46269fdbc
            • MD5 SHA1 SHA512
            Submit Download

            run.vbs
            • Path C:\Users\Admin\99O623~1\run.vbs
            • Size 84B
            • SHA256 2229da69670276efbccb36d4fb72c17b532841c16a735e8e8aa3701a8bf3ebaf
            • MD5 SHA1 SHA512
            Submit Download

            arjegv
            • Path C:\Users\Admin\99o623u41dw\arjegv
            • Size 280.5MB
            • SHA256 fc22c9533e7109817e21d9a4e6cf1dd800ec8f531914757ffc79f1d7d6886263
            • MD5 SHA1 SHA512 SSDEEP
            Submit Download

            gfcbk.exe
            • Path C:\Users\Admin\99o623u41dw\gfcbk.exe
            • Size 807KB
            • SHA256 3c529e81cd390f8d0163131e8a2b2b32fcc8feb465cbdd1680e54be05691ab8c
            • MD5 SHA1 SHA512 SSDEEP
            Submit Download

            gfcbk.exe
            • Path C:\Users\Admin\99o623u41dw\gfcbk.exe
            • Size 807KB
            • SHA256 3c529e81cd390f8d0163131e8a2b2b32fcc8feb465cbdd1680e54be05691ab8c
            • MD5 SHA1 SHA512 SSDEEP
            Submit Download

            gfcbk.exe
            • Path C:\Users\Admin\99o623u41dw\gfcbk.exe
            • Size 807KB
            • SHA256 3c529e81cd390f8d0163131e8a2b2b32fcc8feb465cbdd1680e54be05691ab8c
            • MD5 SHA1 SHA512 SSDEEP
            Submit Download

            memory/1580-145-0x0000000000400000-0x0000000000438000-memory.dmp
            Download

            memory/1580-147-0x0000000073F60000-0x0000000074511000-memory.dmp
            Download

            memory/1580-146-0x0000000073F60000-0x0000000074511000-memory.dmp
            Download