Analysis

  • max time kernel
    156s
  • max time network
    160s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-en-20220112
  • submitted
    21-02-2022 23:10

General

  • Target

    NKP210102-NIT-SC2.exe

  • Size

    897KB

  • MD5

    65b5174a50b047604c2aed66369a4a88

  • SHA1

    853e75392f379c6d9f655c53c881c45287ab2f6b

  • SHA256

    8d8c5013933443f1f3e20db22a1abd56815cdd61b866f7953e032678f5e3d049

  • SHA512

    04e5a3e89538fc8a7b83773f52a9424da327f7fc2709e2f64f977056078e9bee87fc9ebd29619607a63b8844d084f093aa8da7d223eb97154bdb8137312b0d0e

Malware Config

Extracted

Credentials

  • Protocol:
    smtp
  • Host:
    mail.revistaeducar.com.ar
  • Port:
    25
  • Username:
    [email protected]
  • Password:
    somchai#3774

Extracted

Family

matiex

Credentials

  • Protocol:
    smtp
  • Host:
    mail.revistaeducar.com.ar
  • Port:
    25
  • Username:
    [email protected]
  • Password:
    somchai#3774

Signatures

  • Matiex

    Matiex is a keylogger and infostealer first seen in July 2020.

  • Matiex Main Payload 1 IoCs
  • Drops startup file 1 IoCs
  • Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs
  • Looks up external IP address via web service 3 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Suspicious use of SetThreadContext 1 IoCs
  • Drops file in Windows directory 3 IoCs
  • Checks processor information in registry 2 TTPs 2 IoCs

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

  • Modifies data under HKEY_USERS 56 IoCs
  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs
  • outlook_office_path 1 IoCs
  • outlook_win_path 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\NKP210102-NIT-SC2.exe
    "C:\Users\Admin\AppData\Local\Temp\NKP210102-NIT-SC2.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:2728
    • C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
      "{path}"
      2⤵
      • Drops startup file
      • Accesses Microsoft Outlook profiles
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of SetWindowsHookEx
      • outlook_office_path
      • outlook_win_path
      PID:3936
  • C:\Windows\System32\svchost.exe
    C:\Windows\System32\svchost.exe -k NetworkService -p
    1⤵
    • Drops file in Windows directory
    • Modifies data under HKEY_USERS
    PID:2980
  • C:\Windows\system32\MusNotifyIcon.exe
    %systemroot%\system32\MusNotifyIcon.exe NotifyTrayIcon 13
    1⤵
    • Checks processor information in registry
    PID:3188
  • C:\Windows\winsxs\amd64_microsoft-windows-servicingstack_31bf3856ad364e35_10.0.19041.1220_none_7e21bc567c7ed16b\TiWorker.exe
    C:\Windows\winsxs\amd64_microsoft-windows-servicingstack_31bf3856ad364e35_10.0.19041.1220_none_7e21bc567c7ed16b\TiWorker.exe -Embedding
    1⤵
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    PID:1688

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • memory/2728-130-0x000000007499E000-0x000000007499F000-memory.dmp
    Filesize

    4KB

  • memory/2728-131-0x0000000000A60000-0x0000000000B46000-memory.dmp
    Filesize

    920KB

  • memory/2728-132-0x0000000005AA0000-0x0000000006044000-memory.dmp
    Filesize

    5.6MB

  • memory/2728-133-0x00000000054F0000-0x0000000005582000-memory.dmp
    Filesize

    584KB

  • memory/2728-134-0x00000000056F0000-0x00000000056F1000-memory.dmp
    Filesize

    4KB

  • memory/2728-135-0x0000000005680000-0x000000000568A000-memory.dmp
    Filesize

    40KB

  • memory/2728-136-0x0000000007550000-0x00000000075EC000-memory.dmp
    Filesize

    624KB

  • memory/3936-137-0x0000000000400000-0x0000000000474000-memory.dmp
    Filesize

    464KB

  • memory/3936-138-0x00000000056D0000-0x0000000005736000-memory.dmp
    Filesize

    408KB

  • memory/3936-139-0x000000007499E000-0x000000007499F000-memory.dmp
    Filesize

    4KB

  • memory/3936-140-0x00000000058A0000-0x00000000058A1000-memory.dmp
    Filesize

    4KB

  • memory/3936-141-0x0000000007320000-0x00000000074E2000-memory.dmp
    Filesize

    1.8MB