Analysis

  • max time kernel
    150s
  • max time network
    150s
  • platform
    windows7_x64
  • resource
    win7v20210410
  • submitted
    04-05-2021 15:22

General

  • Target

    Invoice No F1019855_PDF.vbs

  • Size

    486KB

  • MD5

    ce4dcec84bfeba49404fa70f5d137645

  • SHA1

    c31021953c59af126d0095bea70c26ca02a2d954

  • SHA256

    ca85b069b028fc30a2af436344eae332ad6afe8a7e3904a48ee63948ab6c3133

  • SHA512

    206f93128c63f78891cd55aff0a2ffe74696845df2f1d2a359bd569716f2a8a7d68c9b12c724c3b5e35963664eba8ce41d8eb65c54f5f36d256fb850635e7b01

Malware Config

Extracted

Family

nanocore

Version

1.2.2.0

C2

sys2021.linkpc.net:11940

191.96.25.26:11940

Mutex

ac555290-50d4-4120-9390-e76e4f948dd7

Attributes
  • activate_away_mode

    true

  • backup_connection_host

    191.96.25.26

  • backup_dns_server

    8.8.4.4

  • buffer_size

    65535

  • build_time

    2021-02-01T07:39:23.093861436Z

  • bypass_user_account_control

    true

  • bypass_user_account_control_data

  • clear_access_control

    true

  • clear_zone_identifier

    false

  • connect_delay

    4000

  • connection_port

    11940

  • default_group

    Start Up

  • 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

    ac555290-50d4-4120-9390-e76e4f948dd7

  • mutex_timeout

    5000

  • prevent_system_sleep

    false

  • primary_connection_host

    sys2021.linkpc.net

  • 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

  • AsyncRat

    AsyncRAT is designed to remotely monitor and control other computers.

  • Contains code to disable Windows Defender 4 IoCs

    A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

  • NanoCore

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

  • Async RAT payload 4 IoCs
  • Executes dropped EXE 3 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Checks whether UAC is enabled 1 TTPs 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). 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 26 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 16 IoCs

Processes

  • C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\Invoice No F1019855_PDF.vbs"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1072
    • C:\Users\Admin\AppData\Local\Temp\ame.exe
      "C:\Users\Admin\AppData\Local\Temp\ame.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1956
      • C:\Windows\System32\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\tmp2E51.tmp.vbs"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:284
        • C:\Windows\System32\schtasks.exe
          "C:\Windows\System32\schtasks.exe" /create /sc onlogon /rl highest /tn Notepads.exe /tr "C:\Users\Admin\AppData\Roaming\Notepads.exe
          4⤵
          • Creates scheduled task(s)
          PID:1012
      • C:\Users\Admin\AppData\Roaming\Notepads.exe
        "C:\Users\Admin\AppData\Roaming\Notepads.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1736
    • C:\Users\Admin\AppData\Local\Temp\fi.exe
      "C:\Users\Admin\AppData\Local\Temp\fi.exe"
      2⤵
      • Executes dropped EXE
      • Adds Run key to start application
      • Checks whether UAC is enabled
      • Drops file in Program Files directory
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of AdjustPrivilegeToken
      PID:1760
  • C:\Windows\system32\wbem\WmiApSrv.exe
    C:\Windows\system32\wbem\WmiApSrv.exe
    1⤵
      PID:1740

    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

    2
    T1082

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Temp\ame.exe
      MD5

      f7f64ec1756119f19d52fb140e22382f

      SHA1

      c4fa973b801d954562fe00ac7bd2c6d051ae6e2f

      SHA256

      c676638b019d810ce392cadcf8f0719f76f305d380d69ba93a6fc60a3f92e2c7

      SHA512

      f29a10012a4e7ef6989bcea75554b12a17415fba4d8181c6a2b3ae0e663fe59b4c5ed910583f898d5c36a5178041a9adcf92ec758b45cea082165e596d7061ba

    • C:\Users\Admin\AppData\Local\Temp\ame.exe
      MD5

      f7f64ec1756119f19d52fb140e22382f

      SHA1

      c4fa973b801d954562fe00ac7bd2c6d051ae6e2f

      SHA256

      c676638b019d810ce392cadcf8f0719f76f305d380d69ba93a6fc60a3f92e2c7

      SHA512

      f29a10012a4e7ef6989bcea75554b12a17415fba4d8181c6a2b3ae0e663fe59b4c5ed910583f898d5c36a5178041a9adcf92ec758b45cea082165e596d7061ba

    • C:\Users\Admin\AppData\Local\Temp\fi.exe
      MD5

      86a588c5a10a04af998dbad9ff9a31d1

      SHA1

      8ac3e114d36f6674bf64d7f45221207e8575ea62

      SHA256

      b9f40a82eb141d2c09e9fdf133b80dceb4163c89471cec7af84db2141c5d51a5

      SHA512

      8978104324435b461be67e148d44271a04a86550c7c1d8c5f474b1a7e63da32fd9400f63a767555f13a2cfb21eec32aac6ca387f39c048fd4e36333cf6747ec9

    • C:\Users\Admin\AppData\Local\Temp\fi.exe
      MD5

      86a588c5a10a04af998dbad9ff9a31d1

      SHA1

      8ac3e114d36f6674bf64d7f45221207e8575ea62

      SHA256

      b9f40a82eb141d2c09e9fdf133b80dceb4163c89471cec7af84db2141c5d51a5

      SHA512

      8978104324435b461be67e148d44271a04a86550c7c1d8c5f474b1a7e63da32fd9400f63a767555f13a2cfb21eec32aac6ca387f39c048fd4e36333cf6747ec9

    • C:\Users\Admin\AppData\Local\Temp\tmp2E51.tmp.vbs
      MD5

      93be4fdb10eed452d4f027b2bdd3aab9

      SHA1

      d49dec91f4ef2aceeaf66bc7aa2ab04e6db53f06

      SHA256

      a37de9a3fcdd78e747502dbd9185df33a7ed1d1a2af7b2cecad6c5ebf34e8b0c

      SHA512

      7ad2f021cb3ce07df310c4d291773c004a9c1c61eef739c0dde5be6588a9d0eebc497b5d4ae446c44c9e2e700e5693f25ec479f2a61f0427ffd988b703ad35e8

    • C:\Users\Admin\AppData\Roaming\Notepads.exe
      MD5

      f7f64ec1756119f19d52fb140e22382f

      SHA1

      c4fa973b801d954562fe00ac7bd2c6d051ae6e2f

      SHA256

      c676638b019d810ce392cadcf8f0719f76f305d380d69ba93a6fc60a3f92e2c7

      SHA512

      f29a10012a4e7ef6989bcea75554b12a17415fba4d8181c6a2b3ae0e663fe59b4c5ed910583f898d5c36a5178041a9adcf92ec758b45cea082165e596d7061ba

    • C:\Users\Admin\AppData\Roaming\Notepads.exe
      MD5

      f7f64ec1756119f19d52fb140e22382f

      SHA1

      c4fa973b801d954562fe00ac7bd2c6d051ae6e2f

      SHA256

      c676638b019d810ce392cadcf8f0719f76f305d380d69ba93a6fc60a3f92e2c7

      SHA512

      f29a10012a4e7ef6989bcea75554b12a17415fba4d8181c6a2b3ae0e663fe59b4c5ed910583f898d5c36a5178041a9adcf92ec758b45cea082165e596d7061ba

    • memory/284-72-0x0000000000000000-mapping.dmp
    • memory/1012-75-0x0000000000000000-mapping.dmp
    • memory/1072-60-0x000007FEFBAB1000-0x000007FEFBAB3000-memory.dmp
      Filesize

      8KB

    • memory/1736-81-0x000000001B010000-0x000000001B012000-memory.dmp
      Filesize

      8KB

    • memory/1736-79-0x0000000000240000-0x0000000000241000-memory.dmp
      Filesize

      4KB

    • memory/1736-76-0x0000000000000000-mapping.dmp
    • memory/1760-64-0x0000000000000000-mapping.dmp
    • memory/1760-70-0x0000000000BF0000-0x0000000000BF1000-memory.dmp
      Filesize

      4KB

    • memory/1760-69-0x0000000075411000-0x0000000075413000-memory.dmp
      Filesize

      8KB

    • memory/1956-71-0x0000000000440000-0x0000000000442000-memory.dmp
      Filesize

      8KB

    • memory/1956-67-0x00000000002E0000-0x00000000002E1000-memory.dmp
      Filesize

      4KB

    • memory/1956-61-0x0000000000000000-mapping.dmp