Analysis

  • max time kernel
    121s
  • max time network
    149s
  • platform
    windows7_x64
  • resource
    win7-20241010-en
  • resource tags

    arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
  • submitted
    31-10-2024 09:46

General

  • Target

    malware.xlsx

  • Size

    2.2MB

  • MD5

    af4a015e14731aca9d5d89d18b6145a5

  • SHA1

    d43b9773c95cf3c7b0db3bf7d7571ea57db88898

  • SHA256

    d54bdc32e63a1159d8775046e4ac77bd96a6745c29049effea5303a37e2d865a

  • SHA512

    9629b2bffe3761bb7a9c5a31dc229f46f42a111825eb1c17a880228ae76a9ebd708e9c274661211dc82c436cf0de8ff0b6f1da45960e9f21c29a8e70ce24c774

  • SSDEEP

    49152:Jp1keRzwrg87vtJer92x2zUkW2AhynUOAgLhouLDDeccF51Q:Jsm387XdkSPkNfJ

Malware Config

Extracted

Family

nanocore

Version

1.2.2.0

C2

66.63.187.113:1664

Mutex

a376f716-2f77-4943-a431-3a3bcb53b7c0

Attributes
  • activate_away_mode

    true

  • backup_connection_host

    66.63.187.113

  • backup_dns_server

    8.8.4.4

  • buffer_size

    65535

  • build_time

    2024-08-05T03:49:33.827385136Z

  • 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

    1664

  • default_group

    CAT

  • 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

    a376f716-2f77-4943-a431-3a3bcb53b7c0

  • mutex_timeout

    5000

  • prevent_system_sleep

    false

  • primary_connection_host

    66.63.187.113

  • 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.

  • Nanocore family
  • Blocklisted process makes network request 1 IoCs
  • Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

    Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

  • Downloads MZ/PE file
  • Executes dropped EXE 3 IoCs
  • Loads dropped DLL 1 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Checks whether UAC is enabled 1 TTPs 1 IoCs
  • Drops file in System32 directory 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).

  • System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Enumerates system info in registry 2 TTPs 1 IoCs
  • Launches Equation Editor 1 TTPs 1 IoCs

    Equation Editor is an old Office component often targeted by exploits such as CVE-2017-11882.

  • Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

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

  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 9 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of SetWindowsHookEx 3 IoCs
  • Suspicious use of WriteProcessMemory 29 IoCs

Processes

  • C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE
    "C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE" /dde C:\Users\Admin\AppData\Local\Temp\malware.xlsx
    1⤵
    • System Location Discovery: System Language Discovery
    • Enumerates system info in registry
    • Suspicious behavior: AddClipboardFormatListener
    • Suspicious use of SetWindowsHookEx
    PID:1528
  • C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE
    "C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE" -Embedding
    1⤵
    • Blocklisted process makes network request
    • Loads dropped DLL
    • System Location Discovery: System Language Discovery
    • Launches Equation Editor
    • Suspicious use of WriteProcessMemory
    PID:948
    • C:\Users\Admin\AppData\Roaming\terwhscat.exe
      "C:\Users\Admin\AppData\Roaming\terwhscat.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of SetThreadContext
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:2740
      • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\terwhscat.exe"
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Drops file in System32 directory
        • System Location Discovery: System Language Discovery
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:2796
      • C:\Users\Admin\AppData\Roaming\terwhscat.exe
        "C:\Users\Admin\AppData\Roaming\terwhscat.exe"
        3⤵
        • Executes dropped EXE
        PID:2632
      • C:\Users\Admin\AppData\Roaming\terwhscat.exe
        "C:\Users\Admin\AppData\Roaming\terwhscat.exe"
        3⤵
        • Executes dropped EXE
        • Adds Run key to start application
        • Checks whether UAC is enabled
        • Drops file in Program Files directory
        • System Location Discovery: System Language Discovery
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious behavior: GetForegroundWindowSpam
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2648
        • C:\Windows\SysWOW64\schtasks.exe
          "schtasks.exe" /create /f /tn "DSL Manager" /xml "C:\Users\Admin\AppData\Local\Temp\tmpEBC6.tmp"
          4⤵
          • System Location Discovery: System Language Discovery
          • Scheduled Task/Job: Scheduled Task
          PID:2928
        • C:\Windows\SysWOW64\schtasks.exe
          "schtasks.exe" /create /f /tn "DSL Manager Task" /xml "C:\Users\Admin\AppData\Local\Temp\tmpEC82.tmp"
          4⤵
          • System Location Discovery: System Language Discovery
          • Scheduled Task/Job: Scheduled Task
          PID:1160

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\tmpEBC6.tmp

    Filesize

    1KB

    MD5

    325b972a0fdd4dea1ce8ff6f91708b99

    SHA1

    d48523c9f34add6a971a834f4fe26eabd2f5ce96

    SHA256

    f0ad5f6b7b9d99cbb86903e6161f20b16356645fc1ce48d607e65830756fb622

    SHA512

    4120e5668c8e51563833934b5ace64d820627d67b16c3e25a8f66ec0bf56165cbe3b85389122acb7c0948ecc123fec920641602c823b05a865270ef54b332172

  • C:\Users\Admin\AppData\Local\Temp\tmpEC82.tmp

    Filesize

    1KB

    MD5

    a0bcaf1694d4fcae2c44258530850f35

    SHA1

    99e9ccea3a9dca8d94808f6488fdc37c0b3bfe73

    SHA256

    099c4a82d8e8ddf5ff801a8f08fb5a143834506e936ce846b380a42eb24e888e

    SHA512

    ad3f2fbc09f7d57c24a35a62f00251c93d480e065f3b7fbc7133736cb144a3031fdc9f3e8be8a1c6dcdb8b3def654618faab416f66a28628ab71e55de4df0da3

  • \Users\Admin\AppData\Roaming\terwhscat.exe

    Filesize

    726KB

    MD5

    23253284300f223fa0e82b92d4c648ac

    SHA1

    25bde72c0e00570a12c5c607b54c5e6368ab0897

    SHA256

    bab8b627c51547d2fd6a9902612fceb62a0f3868583e26b5e06e568e4a375a9f

    SHA512

    098b072b1f3aa4f5d60323677280f1d8f2bd723e30d79c7369a2b6b29dec9bb1d40aeede65228ab3e33451ab68ae61ff94391da144a25608b2ebd9c0800dfd0c

  • memory/1528-0-0x000000005FFF0000-0x0000000060000000-memory.dmp

    Filesize

    64KB

  • memory/1528-1-0x0000000071E7D000-0x0000000071E88000-memory.dmp

    Filesize

    44KB

  • memory/1528-13-0x0000000071E7D000-0x0000000071E88000-memory.dmp

    Filesize

    44KB

  • memory/2648-47-0x0000000000A50000-0x0000000000A5E000-memory.dmp

    Filesize

    56KB

  • memory/2648-40-0x0000000000510000-0x000000000051A000-memory.dmp

    Filesize

    40KB

  • memory/2648-55-0x0000000000CD0000-0x0000000000CFE000-memory.dmp

    Filesize

    184KB

  • memory/2648-18-0x0000000000400000-0x0000000000438000-memory.dmp

    Filesize

    224KB

  • memory/2648-26-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

    Filesize

    4KB

  • memory/2648-29-0x0000000000400000-0x0000000000438000-memory.dmp

    Filesize

    224KB

  • memory/2648-30-0x0000000000400000-0x0000000000438000-memory.dmp

    Filesize

    224KB

  • memory/2648-27-0x0000000000400000-0x0000000000438000-memory.dmp

    Filesize

    224KB

  • memory/2648-24-0x0000000000400000-0x0000000000438000-memory.dmp

    Filesize

    224KB

  • memory/2648-22-0x0000000000400000-0x0000000000438000-memory.dmp

    Filesize

    224KB

  • memory/2648-20-0x0000000000400000-0x0000000000438000-memory.dmp

    Filesize

    224KB

  • memory/2648-56-0x0000000000E00000-0x0000000000E14000-memory.dmp

    Filesize

    80KB

  • memory/2648-54-0x0000000000B90000-0x0000000000B9E000-memory.dmp

    Filesize

    56KB

  • memory/2648-53-0x0000000000B80000-0x0000000000B94000-memory.dmp

    Filesize

    80KB

  • memory/2648-41-0x0000000000800000-0x000000000081E000-memory.dmp

    Filesize

    120KB

  • memory/2648-42-0x0000000000520000-0x000000000052A000-memory.dmp

    Filesize

    40KB

  • memory/2648-45-0x0000000000840000-0x0000000000852000-memory.dmp

    Filesize

    72KB

  • memory/2648-46-0x0000000000A20000-0x0000000000A3A000-memory.dmp

    Filesize

    104KB

  • memory/2648-52-0x0000000000B30000-0x0000000000B40000-memory.dmp

    Filesize

    64KB

  • memory/2648-50-0x0000000000B10000-0x0000000000B1E000-memory.dmp

    Filesize

    56KB

  • memory/2648-49-0x0000000000AC0000-0x0000000000ACC000-memory.dmp

    Filesize

    48KB

  • memory/2648-48-0x0000000000AA0000-0x0000000000AB2000-memory.dmp

    Filesize

    72KB

  • memory/2648-51-0x0000000000B20000-0x0000000000B34000-memory.dmp

    Filesize

    80KB

  • memory/2740-11-0x000000006B84E000-0x000000006B84F000-memory.dmp

    Filesize

    4KB

  • memory/2740-15-0x000000006B84E000-0x000000006B84F000-memory.dmp

    Filesize

    4KB

  • memory/2740-12-0x00000000011D0000-0x000000000128C000-memory.dmp

    Filesize

    752KB

  • memory/2740-14-0x0000000000770000-0x000000000078C000-memory.dmp

    Filesize

    112KB

  • memory/2740-16-0x00000000005B0000-0x000000000062A000-memory.dmp

    Filesize

    488KB