Analysis

  • max time kernel
    150s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    31/05/2024, 18:12

General

  • Target
    bypassdev.exe
  • Size 410KB
  • Sample240531-wtfr3ahb33
  • SHA256 bca6e27840de5c2375667cd775b9d02851229cdd60916770991acfd0ad37d62a
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • nanocore

Version
  • 1.2.2.0

C2
  • gayagoris.ddns.net:7005

Mutex
  • 444ca634-7148-4ffa-81b4-5959bb4b4e5e

Attributes
  • activate_away_mode

    true

  • backup_connection_host

    gayagoris.ddns.net

  • backup_dns_server

    8.8.4.4

  • buffer_size

    65535

  • build_time

    2019-08-05T00:46:31.519038936Z

  • bypass_user_account_control

    false

  • bypass_user_account_control_data

    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

  • clear_access_control

    true

  • clear_zone_identifier

    false

  • connect_delay

    4000

  • connection_port

    7005

  • 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

    444ca634-7148-4ffa-81b4-5959bb4b4e5e

  • mutex_timeout

    5000

  • prevent_system_sleep

    false

  • primary_connection_host

    gayagoris.ddns.net

  • primary_dns_server

    8.8.8.8

  • request_elevation

    false

  • restart_delay

    5000

  • run_delay

    0

  • run_on_startup

    false

  • set_critical_process

    false

  • timeout_interval

    5000

  • use_custom_dns_server

    false

  • version

    1.2.2.0

  • wan_timeout

    8000

Signatures

  • Modifies WinLogon for persistence 2 TTPs 2 IoCs
  • Modifies visiblity of hidden/system files in Explorer 2 TTPs 2 IoCs
  • NanoCore

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

  • Modifies Installed Components in the registry 2 TTPs 8 IoCs
  • Executes dropped EXE 6 IoCs
  • Adds Run key to start application 2 TTPs 5 IoCs
  • Checks whether UAC is enabled 1 TTPs 1 IoCs
  • Drops file in Program Files directory 2 IoCs
  • Drops file in Windows directory 6 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 2 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 14 IoCs
  • Suspicious use of WriteProcessMemory 33 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\bypassdev.exe
    "C:\Users\Admin\AppData\Local\Temp\bypassdev.exe"
    1⤵
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:656
    • \??\c:\users\admin\appdata\local\temp\bypassdev.exe 
      c:\users\admin\appdata\local\temp\bypassdev.exe 
      2⤵
      • Executes dropped EXE
      • Adds Run key to start application
      • Checks whether UAC is enabled
      • Drops file in Program Files directory
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:2252
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks.exe" /create /f /tn "LAN Monitor" /xml "C:\Users\Admin\AppData\Local\Temp\tmp5573.tmp"
        3⤵
        • Creates scheduled task(s)
        PID:3740
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks.exe" /create /f /tn "LAN Monitor Task" /xml "C:\Users\Admin\AppData\Local\Temp\tmp562F.tmp"
        3⤵
        • Creates scheduled task(s)
        PID:3776
    • C:\Users\Admin\AppData\Local\icsys.icn.exe
      C:\Users\Admin\AppData\Local\icsys.icn.exe
      2⤵
      • Executes dropped EXE
      • Drops file in Windows directory
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:1456
      • \??\c:\windows\system\explorer.exe
        c:\windows\system\explorer.exe
        3⤵
        • Modifies WinLogon for persistence
        • Modifies visiblity of hidden/system files in Explorer
        • Modifies Installed Components in the registry
        • Executes dropped EXE
        • Adds Run key to start application
        • Drops file in Windows directory
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious behavior: GetForegroundWindowSpam
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:4624
        • \??\c:\windows\system\spoolsv.exe
          c:\windows\system\spoolsv.exe SE
          4⤵
          • Executes dropped EXE
          • Drops file in Windows directory
          • Suspicious use of SetWindowsHookEx
          • Suspicious use of WriteProcessMemory
          PID:3768
          • \??\c:\windows\system\svchost.exe
            c:\windows\system\svchost.exe
            5⤵
            • Modifies WinLogon for persistence
            • Modifies visiblity of hidden/system files in Explorer
            • Modifies Installed Components in the registry
            • Executes dropped EXE
            • Adds Run key to start application
            • Drops file in Windows directory
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious behavior: GetForegroundWindowSpam
            • Suspicious use of SetWindowsHookEx
            • Suspicious use of WriteProcessMemory
            PID:4628
            • \??\c:\windows\system\spoolsv.exe
              c:\windows\system\spoolsv.exe PR
              6⤵
              • Executes dropped EXE
              • Suspicious use of SetWindowsHookEx
              PID:4936
            • C:\Windows\SysWOW64\at.exe
              at 18:14 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
              6⤵
                PID:4508
              • C:\Windows\SysWOW64\at.exe
                at 18:15 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
                6⤵
                  PID:1736
                • C:\Windows\SysWOW64\at.exe
                  at 18:16 /interactive /every:M,T,W,Th,F,S,Su c:\windows\system\svchost.exe
                  6⤵
                    PID:1176

        Network

              MITRE ATT&CK Enterprise v15

              Replay Monitor

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              Downloads

              bypassdev.exe 

              • Path C:\Users\Admin\AppData\Local\Temp\bypassdev.exe 
              • Size 203KB
              • SHA256 2c92de520918b894d1934c99cfc74f46f979097c125b093077eee38218b01cee
              • MD5 SHA1 SHA512 SSDEEP

              tmp5573.tmp

              • Path C:\Users\Admin\AppData\Local\Temp\tmp5573.tmp
              • Size 1KB
              • SHA256 467fcbd388cb87138ce9383a710c5db70adb502de1c4b9279c282badf2cdf986
              • MD5 SHA1 SHA512

              tmp562F.tmp

              • Path C:\Users\Admin\AppData\Local\Temp\tmp562F.tmp
              • Size 1KB
              • SHA256 64d8cfa0b25afee269839cd5fc0b66e5643bc318e5f4d3ce1b9dba2456c83316
              • MD5 SHA1 SHA512

              icsys.icn.exe

              • Path C:\Users\Admin\AppData\Local\icsys.icn.exe
              • Size 206KB
              • SHA256 eed51642726258b849f74c0a00f5989c6c2257c7f1a09fe3488b3e648c35bc27
              • MD5 SHA1 SHA512 SSDEEP

              mrsys.exe

              • Path C:\Users\Admin\AppData\Roaming\mrsys.exe
              • Size 206KB
              • SHA256 46f432d545a670b8623b44d4df41d3b4b0eb05e84d5643d7e8ee3b36b300e73d
              • MD5 SHA1 SHA512 SSDEEP

              explorer.exe

              • Path C:\Windows\System\explorer.exe
              • Size 206KB
              • SHA256 c498af3dbba549c7515d3cff7e0612ccf7e4b7223fd20bf001f7d2f1f6c5dbe7
              • MD5 SHA1 SHA512 SSDEEP

              spoolsv.exe

              • Path \??\c:\windows\system\spoolsv.exe
              • Size 207KB
              • SHA256 62e6c7b013172f2d388b6383fa3b55c3dce465fc92bc3e46570d1e5979500e7d
              • MD5 SHA1 SHA512 SSDEEP

              svchost.exe

              • Path \??\c:\windows\system\svchost.exe
              • Size 206KB
              • SHA256 f025c7ebae1c3371375b8c3c19ca4257677f4cf73318ed5b9e03cd0a6923c8e3
              • MD5 SHA1 SHA512 SSDEEP

              memory/656-0-0x0000000000400000-0x000000000042F000-memory.dmp

              memory/656-62-0x0000000000400000-0x000000000042F000-memory.dmp

              memory/1456-61-0x0000000000400000-0x000000000042F000-memory.dmp

              memory/1456-19-0x0000000000400000-0x000000000042F000-memory.dmp

              memory/2252-13-0x00000000749B0000-0x0000000074F61000-memory.dmp

              memory/2252-64-0x00000000749B2000-0x00000000749B3000-memory.dmp

              memory/2252-67-0x00000000749B0000-0x0000000074F61000-memory.dmp

              memory/2252-66-0x00000000749B0000-0x0000000074F61000-memory.dmp

              memory/2252-11-0x00000000749B0000-0x0000000074F61000-memory.dmp

              memory/2252-10-0x00000000749B0000-0x0000000074F61000-memory.dmp

              memory/2252-65-0x00000000749B0000-0x0000000074F61000-memory.dmp

              memory/2252-9-0x00000000749B2000-0x00000000749B3000-memory.dmp

              memory/3768-42-0x0000000000400000-0x000000000042F000-memory.dmp

              memory/3768-60-0x0000000000400000-0x000000000042F000-memory.dmp

              memory/4936-59-0x0000000000400000-0x000000000042F000-memory.dmp

              memory/4936-56-0x0000000000400000-0x000000000042F000-memory.dmp