Analysis

  • max time kernel
    9s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230703-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230703-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05-07-2023 13:14

General

  • Target

    Stub/stub.exe

  • Size

    1.6MB

  • MD5

    303df0ff45fc487db83f9a14a7eb3594

  • SHA1

    e36f528cefba775bf21f04cc208e90b815df8234

  • SHA256

    35b48e9472a04ef28d51e5af06dafc8d8573d22bd4159cfc5007b7321a0aa337

  • SHA512

    1ebaec29abe8bf659255a3e78893921a5916f8ab8c8d9f607da27e6284cc885c0951bcda7bcbc6cfb47e650a3f1f96c575f0e38881474a227c02ce84821e11a2

  • SSDEEP

    24576:Di2Q9NXw2/wPOjdGxY2rqkqjVnlqud+/2P+A+ZecdyFoBkkAnexMrdgLs:mTq24GjdGSiqkqXfd+/9AqYanieKd

Score
10/10

Malware Config

Signatures

  • Stealerium

    An open source info stealer written in C# first seen in May 2022.

  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Delays execution with timeout.exe 1 IoCs
  • Kills process with taskkill 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 12 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Stub\stub.exe
    "C:\Users\Admin\AppData\Local\Temp\Stub\stub.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4920
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C C:\Users\Admin\AppData\Local\Temp\tmp7B6A.tmp.bat
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3620
      • C:\Windows\SysWOW64\chcp.com
        chcp 65001
        3⤵
          PID:4052
        • C:\Windows\SysWOW64\taskkill.exe
          TaskKill /F /IM 4920
          3⤵
          • Kills process with taskkill
          • Suspicious use of AdjustPrivilegeToken
          PID:4968
        • C:\Windows\SysWOW64\timeout.exe
          Timeout /T 2 /Nobreak
          3⤵
          • Delays execution with timeout.exe
          PID:4724

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Local\Temp\tmp7B6A.tmp.bat

      Filesize

      57B

      MD5

      fd457c1be8e15c90e2d4c911c7325b49

      SHA1

      cd97c994dc9cf8549a61a39a1eb2382803fe6c83

      SHA256

      240a8c5a4249edd768792499da0ef3ed8011c03614b2473ca9bdcef76ac06291

      SHA512

      875dc246a7fa770a74ed531854a9c70b8c77c8ac5ba29f0dfea5fab2714a5ccc097fae301f02f316837c0bb0e039b135107a8392edbd4076ddf8aa8832e35581

    • memory/4920-133-0x0000000000BF0000-0x0000000000D82000-memory.dmp

      Filesize

      1.6MB

    • memory/4920-134-0x0000000005730000-0x0000000005796000-memory.dmp

      Filesize

      408KB

    • memory/4920-135-0x00000000056B0000-0x00000000056C0000-memory.dmp

      Filesize

      64KB