Analysis

  • max time kernel
    116s
  • max time network
    149s
  • platform
    windows7_x64
  • resource
    win7v20201028
  • submitted
    23-02-2021 12:53

General

  • Target

    uqoYt8EFEWQXAne.exe

  • Size

    515KB

  • MD5

    c415765ef678428f502b101039b7d495

  • SHA1

    e5458ff58b98401d715a68a67afabdefaaf2edc3

  • SHA256

    c024e649afaafd4d1a1ebc2c5a2c457eecd2b5994c2b78e32312eb5289b5c093

  • SHA512

    859deb240d2e8ee1b5cc057aa63b0f8d49fec83619b4c346821b09efa5b9fca01fb85396045658860468107f9a19a8710db85c2c7b299351f6225c64034f2d8c

Malware Config

Extracted

Family

nanocore

Version

1.2.2.0

C2

185.239.242.243:2010

127.0.0.1:2010

Mutex

9e8dc517-1111-49c1-9ace-3da1a887c465

Attributes
  • activate_away_mode

    true

  • backup_connection_host

    127.0.0.1

  • backup_dns_server

    8.8.4.4

  • buffer_size

    65535

  • build_time

    2020-12-04T23:48:40.197283836Z

  • bypass_user_account_control

    true

  • bypass_user_account_control_data

  • clear_access_control

    true

  • clear_zone_identifier

    false

  • connect_delay

    4000

  • connection_port

    2010

  • default_group

    ozil pc

  • 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

    9e8dc517-1111-49c1-9ace-3da1a887c465

  • mutex_timeout

    5000

  • prevent_system_sleep

    false

  • primary_connection_host

    185.239.242.243

  • 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

Signatures

  • NanoCore

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

  • Looks for VirtualBox Guest Additions in registry 2 TTPs
  • Looks for VMWare Tools registry key 2 TTPs
  • Checks BIOS information in registry 2 TTPs 2 IoCs

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

  • Checks whether UAC is enabled 1 TTPs 1 IoCs
  • Maps connected drives based on registry 3 TTPs 2 IoCs

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

  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 1 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 17 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\uqoYt8EFEWQXAne.exe
    "C:\Users\Admin\AppData\Local\Temp\uqoYt8EFEWQXAne.exe"
    1⤵
    • Checks BIOS information in registry
    • Maps connected drives based on registry
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1904
    • C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\krPtdhRIieabB" /XML "C:\Users\Admin\AppData\Local\Temp\tmpAED5.tmp"
      2⤵
      • Creates scheduled task(s)
      PID:680
    • C:\Users\Admin\AppData\Local\Temp\uqoYt8EFEWQXAne.exe
      "C:\Users\Admin\AppData\Local\Temp\uqoYt8EFEWQXAne.exe"
      2⤵
        PID:328
      • C:\Users\Admin\AppData\Local\Temp\uqoYt8EFEWQXAne.exe
        "C:\Users\Admin\AppData\Local\Temp\uqoYt8EFEWQXAne.exe"
        2⤵
        • Checks whether UAC is enabled
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious behavior: GetForegroundWindowSpam
        • Suspicious use of AdjustPrivilegeToken
        PID:664

    Network

    MITRE ATT&CK Matrix ATT&CK v6

    Execution

    Scheduled Task

    1
    T1053

    Persistence

    Scheduled Task

    1
    T1053

    Privilege Escalation

    Scheduled Task

    1
    T1053

    Defense Evasion

    Virtualization/Sandbox Evasion

    2
    T1497

    Discovery

    Query Registry

    4
    T1012

    Virtualization/Sandbox Evasion

    2
    T1497

    System Information Discovery

    4
    T1082

    Peripheral Device Discovery

    1
    T1120

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Temp\tmpAED5.tmp
      MD5

      e21afaa184fdfbead83b913f88c40871

      SHA1

      13e98970affef600e11a09ce2fd9c362c7bd1eaa

      SHA256

      cb84eaee6184bbda0b7e42ec72bf336315249e0c06dc170f987b40eec88ea096

      SHA512

      d0c44eebe1426279a18e30a7e8d545407bf27f7f55d8e21e7e425b8e2f65178289a8ee50139c9f997a237e5e71f6b75358555339727a5638dde075c813cedce5

    • memory/664-16-0x0000000000A70000-0x0000000000A89000-memory.dmp
      Filesize

      100KB

    • memory/664-24-0x0000000004B60000-0x0000000004B66000-memory.dmp
      Filesize

      24KB

    • memory/664-18-0x0000000004AB0000-0x0000000004AB1000-memory.dmp
      Filesize

      4KB

    • memory/664-19-0x0000000000A90000-0x0000000000A9D000-memory.dmp
      Filesize

      52KB

    • memory/664-17-0x00000000004E0000-0x00000000004E3000-memory.dmp
      Filesize

      12KB

    • memory/664-29-0x0000000004D40000-0x0000000004D69000-memory.dmp
      Filesize

      164KB

    • memory/664-11-0x000000000041E792-mapping.dmp
    • memory/664-10-0x0000000000400000-0x0000000000438000-memory.dmp
      Filesize

      224KB

    • memory/664-12-0x0000000074320000-0x0000000074A0E000-memory.dmp
      Filesize

      6.9MB

    • memory/664-13-0x0000000000400000-0x0000000000438000-memory.dmp
      Filesize

      224KB

    • memory/664-15-0x00000000004D0000-0x00000000004D5000-memory.dmp
      Filesize

      20KB

    • memory/664-28-0x0000000004C20000-0x0000000004C2A000-memory.dmp
      Filesize

      40KB

    • memory/664-30-0x0000000004D70000-0x0000000004D7F000-memory.dmp
      Filesize

      60KB

    • memory/664-27-0x0000000004C10000-0x0000000004C1F000-memory.dmp
      Filesize

      60KB

    • memory/664-26-0x0000000004BC0000-0x0000000004BC9000-memory.dmp
      Filesize

      36KB

    • memory/664-20-0x0000000000C00000-0x0000000000C15000-memory.dmp
      Filesize

      84KB

    • memory/664-21-0x0000000000BB0000-0x0000000000BB6000-memory.dmp
      Filesize

      24KB

    • memory/664-22-0x0000000000D20000-0x0000000000D2C000-memory.dmp
      Filesize

      48KB

    • memory/664-23-0x0000000000F60000-0x0000000000F67000-memory.dmp
      Filesize

      28KB

    • memory/664-25-0x0000000004B70000-0x0000000004B7D000-memory.dmp
      Filesize

      52KB

    • memory/680-8-0x0000000000000000-mapping.dmp
    • memory/1904-5-0x0000000000DB0000-0x0000000000DB1000-memory.dmp
      Filesize

      4KB

    • memory/1904-7-0x0000000005B60000-0x0000000005BBB000-memory.dmp
      Filesize

      364KB

    • memory/1904-6-0x0000000000960000-0x0000000000963000-memory.dmp
      Filesize

      12KB

    • memory/1904-2-0x0000000074320000-0x0000000074A0E000-memory.dmp
      Filesize

      6.9MB

    • memory/1904-3-0x0000000000F70000-0x0000000000F71000-memory.dmp
      Filesize

      4KB