Overview

overview

10

Static

static

10

Update.exe

windows10-2004-x64

10

Update.exe

windows11-ltsc_2024-x64

10

Analysis

  • user interaction
    yes
  • max time kernel
    150s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260513-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    24/07/2026, 04:06

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General

  • Target
    Update.exe
  • Size 5.6MB
  • Sample260724-epcfea1wcs
  • SHA256 db874ae685d2bc4235b1213ec9d43d327c8d2bd12300bb0d78c9ce0a84c828b2
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
costuradefense_evasiondiscoveryexecutionmilleniumratpackerpersistenceratstealer

Malware Config

Signatures

  • Family: MilleniumRat

    MilleniumRat is a remote access trojan written in C#.

    ratstealermilleniumrat
  • Detects MilleniumRAT stealer 2 IoCs
  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 3 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
    persistence
  • Contacts third-party web service commonly abused for C2 1 TTPs 4 IoCs

    Legitimate web (hosting) services can be abused by malware authors to host malware or C2s.

  • Looks up external IP address via web service 1 IoCs

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

  • Enumerates processes with tasklist 1 TTPs 1 IoCs
    discovery
  • Costura .NET executable packer 1 IoCs

    Costura packer aka Costura Fody, is an add-in for the .NET framework that embeds all external dependency .dll files as resources inside main executable.

    costurapacker
  • Enumerates physical storage devices 1 TTPs

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

  • Executes a command shell one-liner 1 TTPs 2 IoCs

    Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

    execution
  • Delays execution with timeout.exe 1 IoCs
    defense_evasion
  • Modifies registry key 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 7 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Update.exe
    "C:\Users\Admin\AppData\Local\Temp\Update.exe"
    1⤵
    • Checks computer location settings
    • Loads dropped DLL
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1104
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C C:\Users\Admin\AppData\Local\Temp\tmpEA9A.tmp.bat & Del C:\Users\Admin\AppData\Local\Temp\tmpEA9A.tmp.bat
      2⤵
      • Executes a command shell one-liner
      • Suspicious use of WriteProcessMemory
      PID:3136
      • C:\Windows\system32\tasklist.exe
        Tasklist /fi "PID eq 1104"
        3⤵
        • Enumerates processes with tasklist
        • Suspicious use of AdjustPrivilegeToken
        PID:2744
      • C:\Windows\system32\find.exe
        find ":"
        3⤵
          PID:3304
        • C:\Windows\system32\timeout.exe
          Timeout /T 1 /Nobreak
          3⤵
          • Delays execution with timeout.exe
          PID:3404
        • C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLog\Update.exe
          "C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLog\Update.exe"
          3⤵
          • Checks computer location settings
          • Executes dropped EXE
          • Loads dropped DLL
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of SetWindowsHookEx
          • Suspicious use of WriteProcessMemory
          PID:1144
          • C:\Windows\System32\cmd.exe
            "C:\Windows\System32\cmd.exe" /c reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Run /v ChromeUpdate /t REG_SZ /d C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLog\Update.exe /f
            4⤵
            • Executes a command shell one-liner
            • Suspicious use of WriteProcessMemory
            PID:2424
            • C:\Windows\system32\reg.exe
              reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Run /v ChromeUpdate /t REG_SZ /d C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLog\Update.exe /f
              5⤵
              • Adds Run key to start application
              • Modifies registry key
              PID:3812
    • C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLog\Update.exe
      C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLog\Update.exe
      1⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:4508

    Network

          MITRE ATT&CK Enterprise v16

          Replay Monitor

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          Downloads

          Update.exe.log
          • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Update.exe.log
          • Size 1KB
          • SHA256 ddf23e89544edc57abd390e73b6dd42c9ff14b8fb3f1e2e0be1994d11f1df0e7
          • MD5 SHA1 SHA512 TLSH
          Submit Download

          sqlite.interop.dll
          • Path C:\Users\Admin\AppData\Local\Temp\Costura\A54E036D2DCD19384E8EA53862E0DD8F\64\sqlite.interop.dll
          • Size 1.7MB
          • SHA256 aba67c7e6c01856838b8bc6b0ba95e864e1fdcb3750aa7cdc1bc73511cea6fe4
          • MD5 SHA1 SHA512 SSDEEP TLSH
          Submit Download

          tmpEA9A.tmp.bat
          • Path C:\Users\Admin\AppData\Local\Temp\tmpEA9A.tmp.bat
          • Size 256B
          • SHA256 e71c2628d50f1a143cee6ab496347337716781f2c7920b8c2d1590ba8a4ccb83
          • MD5 SHA1 SHA512 TLSH
          Submit Download

          Update.exe
          • Path C:\Users\Admin\AppData\Roaming\GoogleChromeUpdateLog\Update.exe
          • Size 5.6MB
          • SHA256 db874ae685d2bc4235b1213ec9d43d327c8d2bd12300bb0d78c9ce0a84c828b2
          • MD5 SHA1 SHA512 SSDEEP TLSH
          Submit Download

          memory/1104-0-0x0000022A6EE20000-0x0000022A6F3C0000-memory.dmp
          Download

          memory/1104-5-0x0000022A71850000-0x0000022A718C6000-memory.dmp
          Download

          memory/1104-6-0x0000022A71030000-0x0000022A71040000-memory.dmp
          Download

          memory/1104-7-0x0000022A71030000-0x0000022A71040000-memory.dmp
          Download

          memory/1144-18-0x000001D5A6C30000-0x000001D5A6C4E000-memory.dmp
          Download