Overview

overview

10

Static

static

10

VHS558.exe

windows10-2004-x64

10

VHS558.exe

windows11-ltsc_2024-x64

10

Analysis

  • max time kernel
    148s
  • max time network
    148s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260709-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    02/08/2026, 05:03

Sharing

Copy URL Twitter E-mail
Report Analysis Logs

General

  • Target
    VHS558.exe
  • Size 203KB
  • Sample260802-fp8dhsdd64
  • SHA256 b9e2aff345e16ac8c58b020b5a4ecc159d545f1b303f2c830b0f5a221468b639
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
defense_evasiondiscoveryexecutionnanocorekeyloggerpersistencespywarestealertrojan

Malware Config

Extracted

Family

  • nanocore

Version

  • 1.2.2.0

C2

  • kema.io:443

  • www.kema.io:443

Mutex

  • 3df2f1a4-08ce-4c2f-85a6-c5603db0d056

Attributes
  • activate_away_mode

    true

  • backup_connection_host

    www.kema.io

  • backup_dns_server

    8.8.4.4

  • buffer_size

    65535

  • build_time

    2026-05-14T06:19:16.097475936Z

  • 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

    443

  • default_group

    Default

  • 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

    3df2f1a4-08ce-4c2f-85a6-c5603db0d056

  • mutex_timeout

    5000

  • prevent_system_sleep

    false

  • primary_connection_host

    kema.io

  • primary_dns_server

    8.8.8.8

  • request_elevation

    false

  • 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

  • Family: NanoCore

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

    keyloggertrojanstealerspywarenanocore
  • Executes dropped EXE 1 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
    persistence
  • Checks whether UAC is enabled 1 TTPs 1 IoCs
    defense_evasiontrojan
  • Drops file in Program Files directory 1 IoCs
  • System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

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

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

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

    persistenceexecution
  • Suspicious behavior: EnumeratesProcesses 62 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\VHS558.exe
    "C:\Users\Admin\AppData\Local\Temp\VHS558.exe"
    1⤵
    • 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:2608
    • C:\Windows\SysWOW64\schtasks.exe
      "schtasks.exe" /create /f /tn "SMTP Monitor" /xml "C:\Users\Admin\AppData\Local\Temp\tmpB9FF.tmp"
      2⤵
      • System Location Discovery: System Language Discovery
      • Scheduled Task/Job: Scheduled Task
      PID:1256
    • C:\Windows\SysWOW64\schtasks.exe
      "schtasks.exe" /create /f /tn "SMTP Monitor Task" /xml "C:\Users\Admin\AppData\Local\Temp\tmpBA7D.tmp"
      2⤵
      • System Location Discovery: System Language Discovery
      • Scheduled Task/Job: Scheduled Task
      PID:1116
  • C:\Users\Admin\AppData\Local\Temp\VHS558.exe
    "C:\Users\Admin\AppData\Local\Temp\VHS558.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    PID:4832
  • C:\Program Files (x86)\SMTP Monitor\smtpmon.exe
    "C:\Program Files (x86)\SMTP Monitor\smtpmon.exe"
    1⤵
    • Executes dropped EXE
    • System Location Discovery: System Language Discovery
    PID:5412
  • C:\Windows\system32\svchost.exe
    C:\Windows\system32\svchost.exe -k GPSvcGroup
    1⤵
      PID:4932

    Network

          MITRE ATT&CK Enterprise v16

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          smtpmon.exe
          • Path C:\Program Files (x86)\SMTP Monitor\smtpmon.exe
          • Size 203KB
          • SHA256 b9e2aff345e16ac8c58b020b5a4ecc159d545f1b303f2c830b0f5a221468b639
          • MD5 SHA1 SHA512 SSDEEP TLSH
          Submit Download

          tmpB9FF.tmp
          • Path C:\Users\Admin\AppData\Local\Temp\tmpB9FF.tmp
          • Size 1KB
          • SHA256 e26a46aa8b3a2fa32983ffb58de5155eb23efe74d834601eda9d5cf821203523
          • MD5 SHA1 SHA512 TLSH
          Submit Download

          tmpBA7D.tmp
          • Path C:\Users\Admin\AppData\Local\Temp\tmpBA7D.tmp
          • Size 1KB
          • SHA256 1e45d509d390405f93e9f3b64ff497e61cf9bf791c015dde4499184b7a681eb3
          • MD5 SHA1 SHA512 TLSH
          Submit Download

          memory/2608-13-0x0000000001A20000-0x0000000001A30000-memory.dmp
          Download

          memory/2608-8-0x00000000745B0000-0x0000000074BD1000-memory.dmp
          Download

          memory/2608-1-0x00000000745B2000-0x00000000745B4000-memory.dmp
          Download

          memory/2608-0-0x0000000001A20000-0x0000000001A30000-memory.dmp
          Download

          memory/2608-16-0x00000000745B2000-0x00000000745B4000-memory.dmp
          Download

          memory/2608-17-0x00000000745B0000-0x0000000074BD1000-memory.dmp
          Download

          memory/4832-10-0x00000000745B0000-0x0000000074BD1000-memory.dmp
          Download

          memory/4832-14-0x00000000745B0000-0x0000000074BD1000-memory.dmp
          Download

          memory/5412-11-0x00000000745B0000-0x0000000074BD1000-memory.dmp
          Download

          memory/5412-12-0x00000000745B0000-0x0000000074BD1000-memory.dmp
          Download

          memory/5412-15-0x00000000745B0000-0x0000000074BD1000-memory.dmp
          Download