Analysis

  • max time kernel
    146s
  • max time network
    146s
  • platform
    windows10_x64
  • resource
    win10v200430
  • submitted
    30-06-2020 13:02

General

  • Target

    ZtwPj90AM5uNjVx.exe

  • Size

    390KB

  • MD5

    4c05e57f9047e2206f9e1d168fa06481

  • SHA1

    6346ac10485dfb99bbf1a2570d306feacda3f7ba

  • SHA256

    dd02cb85d94d9d687d5de330f198abd8f1a84720947c03dfad880526830986f3

  • SHA512

    3f09c8173095b5fff64a43b0ba8259d9f358a27b55ab6fec637d93683f7abfb949edf89937481d3b15920329b1e41f34544203cc22976da6f6dc3334935a43fd

Malware Config

Extracted

Family

nanocore

Version

1.2.2.0

C2

91.193.75.58:1985

Mutex

596c2bb9-90b7-4362-af9a-082627ebed15

Attributes
  • activate_away_mode

    true

  • backup_connection_host

    127.0.0.1

  • backup_dns_server

    8.8.4.4

  • buffer_size

    65535

  • build_time

    2020-03-30T21:40:30.911959536Z

  • bypass_user_account_control

    true

  • bypass_user_account_control_data

  • clear_access_control

    false

  • clear_zone_identifier

    false

  • connect_delay

    4000

  • connection_port

    1985

  • default_group

    official

  • 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

    596c2bb9-90b7-4362-af9a-082627ebed15

  • mutex_timeout

    5000

  • prevent_system_sleep

    true

  • primary_connection_host

    91.193.75.58

  • 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

  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Adds Run entry to start application 2 TTPs 1 IoCs
  • 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 9 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Drops file in Program Files directory 2 IoCs
  • Checks whether UAC is enabled 1 TTPs 1 IoCs
  • NanoCore

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

  • Suspicious use of WriteProcessMemory 14 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\ZtwPj90AM5uNjVx.exe
    "C:\Users\Admin\AppData\Local\Temp\ZtwPj90AM5uNjVx.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:3544
    • C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\EmEIYFCwLYSPp" /XML "C:\Users\Admin\AppData\Local\Temp\tmp2D9E.tmp"
      2⤵
      • Creates scheduled task(s)
      PID:2472
    • C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe
      "{path}"
      2⤵
        PID:2800
      • C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe
        "{path}"
        2⤵
        • Suspicious behavior: GetForegroundWindowSpam
        • Adds Run entry to start application
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Drops file in Program Files directory
        • Checks whether UAC is enabled
        PID:2816

    Network

    MITRE ATT&CK Matrix ATT&CK v6

    Execution

    Scheduled Task

    1
    T1053

    Persistence

    Registry Run Keys / Startup Folder

    1
    T1060

    Scheduled Task

    1
    T1053

    Privilege Escalation

    Scheduled Task

    1
    T1053

    Defense Evasion

    Modify Registry

    1
    T1112

    Discovery

    System Information Discovery

    1
    T1082

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Temp\tmp2D9E.tmp
    • memory/2472-0-0x0000000000000000-mapping.dmp
    • memory/2816-2-0x0000000000400000-0x0000000000438000-memory.dmp
      Filesize

      224KB

    • memory/2816-3-0x000000000041E792-mapping.dmp