Analysis

  • max time kernel
    147s
  • max time network
    154s
  • platform
    windows7_x64
  • resource
    win7-20220414-en
  • submitted
    21-05-2022 02:13

General

  • Target

    INVOICE_.exe

  • Size

    426KB

  • MD5

    3aabfce5e93698b645131b1c75805f91

  • SHA1

    42bfb73931a29f5141d2f83ca1b4b0de931051ad

  • SHA256

    3c26a85d0b5ca9e7a75dfff1b355cdf2a0aeac1dc892fe9be7def4085eb2bc74

  • SHA512

    e4eadbd2fe272250cd196e5ccb29ec40e884e4e9d25a641df7cf81761ff596b432adeefa5abf4bea5ed9897643db79c05b85553063570ea3a125e38ec426dccc

Malware Config

Extracted

Family

nanocore

Version

1.2.2.0

C2

u852117.nvpn.to:5638

Mutex

c20191a5-cd52-4887-8771-2d1dca5667b7

Attributes
  • activate_away_mode

    true

  • backup_connection_host

    u852117.nvpn.to

  • backup_dns_server

    8.8.4.4

  • buffer_size

    65535

  • build_time

    2020-03-19T15:09:07.734275836Z

  • bypass_user_account_control

    true

  • bypass_user_account_control_data

  • clear_access_control

    true

  • clear_zone_identifier

    false

  • connect_delay

    4000

  • connection_port

    5638

  • default_group

    BEGINS

  • 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

    c20191a5-cd52-4887-8771-2d1dca5667b7

  • mutex_timeout

    5000

  • prevent_system_sleep

    false

  • primary_connection_host

    u852117.nvpn.to

  • 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.

  • Checks whether UAC is enabled 1 TTPs 1 IoCs
  • 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 2 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 13 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\INVOICE_.exe
    "C:\Users\Admin\AppData\Local\Temp\INVOICE_.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:1068
    • C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\oXwzmYgQkRz" /XML "C:\Users\Admin\AppData\Local\Temp\tmpA5F1.tmp"
      2⤵
      • Creates scheduled task(s)
      PID:1244
    • C:\Users\Admin\AppData\Local\Temp\INVOICE_.exe
      "{path}"
      2⤵
      • Checks whether UAC is enabled
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of AdjustPrivilegeToken
      PID:2020

Network

MITRE ATT&CK Matrix ATT&CK v6

Execution

Scheduled Task

1
T1053

Persistence

Scheduled Task

1
T1053

Privilege Escalation

Scheduled Task

1
T1053

Discovery

System Information Discovery

2
T1082

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Local\Temp\tmpA5F1.tmp
    Filesize

    1KB

    MD5

    3c01ac7c56cf92fa529987a4bcfbcbfa

    SHA1

    e762f912d12ab669e096264975f9f0a85a65afa5

    SHA256

    2ac027a5ae2a0b00b83694c889cea021d28e11566dda607420d5926383c431e0

    SHA512

    241745231cf64124038bd306ce45e60355161b6b2e07447a3cc743552e7aaa0d41eb3adfb2e067a5a4754e5675ce1510fcd343c0cbf6b91fab572a3bf5c11feb

  • memory/1068-54-0x0000000075C51000-0x0000000075C53000-memory.dmp
    Filesize

    8KB

  • memory/1068-55-0x0000000074F10000-0x00000000754BB000-memory.dmp
    Filesize

    5.7MB

  • memory/1244-56-0x0000000000000000-mapping.dmp
  • memory/2020-61-0x0000000000400000-0x0000000000438000-memory.dmp
    Filesize

    224KB

  • memory/2020-59-0x0000000000400000-0x0000000000438000-memory.dmp
    Filesize

    224KB

  • memory/2020-58-0x0000000000400000-0x0000000000438000-memory.dmp
    Filesize

    224KB

  • memory/2020-62-0x0000000000400000-0x0000000000438000-memory.dmp
    Filesize

    224KB

  • memory/2020-64-0x0000000000400000-0x0000000000438000-memory.dmp
    Filesize

    224KB

  • memory/2020-65-0x000000000041E792-mapping.dmp
  • memory/2020-67-0x0000000000400000-0x0000000000438000-memory.dmp
    Filesize

    224KB

  • memory/2020-69-0x0000000000400000-0x0000000000438000-memory.dmp
    Filesize

    224KB

  • memory/2020-71-0x0000000074EA0000-0x000000007544B000-memory.dmp
    Filesize

    5.7MB