Overview

overview

7

Static

static

3

ESign_Acro...te.exe

windows10-2004-x64

7

ESign_Acro...te.exe

windows11-ltsc_2024-x64

7

Analysis

  • max time kernel
    151s
  • max time network
    150s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260710-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260710-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    22/08/2026, 18:14

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General

  • Target
    ESign_Acrobat_Update.exe
  • Size 35.3MB
  • Sample260822-wvprcsar41
  • SHA256 29b502be21c4fc4dcac596a240877f554b231d66102694b00bb6cfe001541f3e
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
7/10
discoveryexecutionransomware

Malware Config

Signatures

  • Executes dropped EXE 9 IoCs
  • Loads dropped DLL 7 IoCs
  • Badlisted process makes network request 2 IoCs

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

  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

    discovery
  • Enumerates connected drives 3 TTPs 46 IoCs

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

  • Drops file in Program Files directory 64 IoCs
  • Drops file in Windows directory 13 IoCs
  • Executes a command shell one-liner 1 TTPs 1 IoCs

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

    execution
  • System Location Discovery: System Language Discovery 1 TTPs 6 IoCs

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

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

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

  • Modifies data under HKEY_USERS 3 IoCs
  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of AdjustPrivilegeToken 57 IoCs
  • Suspicious use of FindShellTrayWindow 2 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 12 IoCs
  • Uses Volume Shadow Copy service COM API

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

    ransomware

Processes

  • C:\Users\Admin\AppData\Local\Temp\ESign_Acrobat_Update.exe
    "C:\Users\Admin\AppData\Local\Temp\ESign_Acrobat_Update.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3896
    • C:\Users\Admin\AppData\Local\Temp\{6E7C0EC4-8E54-4824-A2C2-3E53BF2DD72E}\ESign_Acrobat_Update.exe
      C:\Users\Admin\AppData\Local\Temp\{6E7C0EC4-8E54-4824-A2C2-3E53BF2DD72E}\ESign_Acrobat_Update.exe -package:"C:\Users\Admin\AppData\Local\Temp\ESign_Acrobat_Update.exe" -no_selfdeleter -IS_temp -media_path:"C:\Users\Admin\AppData\Local\Temp\{6E7C0EC4-8E54-4824-A2C2-3E53BF2DD72E}\Disk1\" -tempdisk1folder:"C:\Users\Admin\AppData\Local\Temp\{6E7C0EC4-8E54-4824-A2C2-3E53BF2DD72E}\" -IS_OriginalLauncher:"C:\Users\Admin\AppData\Local\Temp\{6E7C0EC4-8E54-4824-A2C2-3E53BF2DD72E}\Disk1\ESign_Acrobat_Update.exe" -waitingforchildprocess
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:1776
      • C:\Users\Admin\AppData\Local\Temp\{046C564E-2B3C-43EA-83A2-B39C831821DB}\ISBEW64.exe
        C:\Users\Admin\AppData\Local\Temp\{046C564E-2B3C-43EA-83A2-B39C831821DB}\ISBEW64.exe {EFB7539B-24F3-46B6-AF6E-3B021B51EFEF}:{2C9CC7EC-8C2C-4A50-BEF0-AD550B4AE42D}
        3⤵
        • Executes dropped EXE
        PID:4568
      • C:\Users\Admin\AppData\Local\Temp\{046C564E-2B3C-43EA-83A2-B39C831821DB}\ISBEW64.exe
        C:\Users\Admin\AppData\Local\Temp\{046C564E-2B3C-43EA-83A2-B39C831821DB}\ISBEW64.exe {EFB7539B-24F3-46B6-AF6E-3B021B51EFEF}:{2BFD5635-F207-4519-9075-7B2024B96C67}
        3⤵
        • Executes dropped EXE
        PID:2612
      • C:\Users\Admin\AppData\Local\Temp\{046C564E-2B3C-43EA-83A2-B39C831821DB}\ISBEW64.exe
        C:\Users\Admin\AppData\Local\Temp\{046C564E-2B3C-43EA-83A2-B39C831821DB}\ISBEW64.exe {EFB7539B-24F3-46B6-AF6E-3B021B51EFEF}:{B59CF431-8BC5-4E59-93C1-D68A509AE96D}
        3⤵
        • Executes dropped EXE
        PID:5860
      • C:\Users\Admin\AppData\Local\Temp\{046C564E-2B3C-43EA-83A2-B39C831821DB}\ISBEW64.exe
        C:\Users\Admin\AppData\Local\Temp\{046C564E-2B3C-43EA-83A2-B39C831821DB}\ISBEW64.exe {EFB7539B-24F3-46B6-AF6E-3B021B51EFEF}:{B5E44310-CC0E-4B66-BBDF-61BD19374B4B}
        3⤵
        • Executes dropped EXE
        PID:5532
      • C:\Users\Admin\AppData\Local\Temp\{046C564E-2B3C-43EA-83A2-B39C831821DB}\ISBEW64.exe
        C:\Users\Admin\AppData\Local\Temp\{046C564E-2B3C-43EA-83A2-B39C831821DB}\ISBEW64.exe {EFB7539B-24F3-46B6-AF6E-3B021B51EFEF}:{842C7E2E-7A2E-4460-AA2E-BBA1A2E80C08}
        3⤵
        • Executes dropped EXE
        PID:4328
      • C:\Users\Admin\AppData\Local\Temp\{046C564E-2B3C-43EA-83A2-B39C831821DB}\ISBEW64.exe
        C:\Users\Admin\AppData\Local\Temp\{046C564E-2B3C-43EA-83A2-B39C831821DB}\ISBEW64.exe {EFB7539B-24F3-46B6-AF6E-3B021B51EFEF}:{ADF7B76E-2B5C-4D22-8562-9172CFDFC4B1}
        3⤵
        • Executes dropped EXE
        PID:3524
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\SysWOW64\cmd.exe /c C:\Windows\TEMP\ZOHOAS~1\INVOKE~1.BAT -path "C:\Users\Admin\AppData\Local\Temp\ESign_Acrobat_Update.exe" > C:\Windows\TEMP\ZohoAssist\InvokeMeetinglog.txt 2>&1
        3⤵
        • Executes a command shell one-liner
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:3000
        • C:\Windows\SysWOW64\msiexec.exe
          msiexec /i C:\Windows\temp\ZohoAssist\ZA_Access.msi INSTALLER_PATH="C:\Users\Admin\AppData\Local\Temp\ESign_Acrobat_Update.exe"
          4⤵
          • Badlisted process makes network request
          • Enumerates connected drives
          • System Location Discovery: System Language Discovery
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of FindShellTrayWindow
          • Suspicious use of SetWindowsHookEx
          PID:1664
  • C:\Windows\system32\msiexec.exe
    C:\Windows\system32\msiexec.exe /V
    1⤵
    • Enumerates connected drives
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • Modifies data under HKEY_USERS
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:4760
    • C:\Windows\system32\srtasks.exe
      C:\Windows\system32\srtasks.exe ExecuteScopeRestorePoint /WaitForRestorePoint:2
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:5456
    • C:\Program Files (x86)\ZohoMeeting\UnAttended\ZADeployer.exe
      "C:\Program Files (x86)\ZohoMeeting\UnAttended\ZADeployer.exe" install
      2⤵
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:4640
      • C:\Program Files (x86)\ZohoMeeting\UnAttended\7z.exe
        "C:\Program Files (x86)\ZohoMeeting\UnAttended\\\7z.exe" x "C:\Program Files (x86)\ZohoMeeting\UnAttended\\\ZohoMeeting.7z" -o"C:\Program Files (x86)\ZohoMeeting\UnAttended\\" -y
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • Drops file in Program Files directory
        • System Location Discovery: System Language Discovery
        • Suspicious use of AdjustPrivilegeToken
        PID:3988
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Checks SCSI registry key(s)
    • Suspicious use of AdjustPrivilegeToken
    PID:1184

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        7z.dll
        • Path C:\Program Files (x86)\ZohoMeeting\UnAttended\7z.dll
        • Size 1.1MB
        • SHA256 25a52dd0a38f58001779b12e84c2937aa52a922a4db9c43fa89214f11a3f4766
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        7z.exe
        • Path C:\Program Files (x86)\ZohoMeeting\UnAttended\7z.exe
        • Size 265KB
        • SHA256 54353ea62390f3151fc9dd9cadc86694e17d7d75a7ee6e39ca6285fa4bfb7336
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        AssistLogo_white_border_32.ico
        • Path C:\Program Files (x86)\ZohoMeeting\UnAttended\AssistLogo_white_border_32.ico
        • Size 14KB
        • SHA256 dd72cc36c3e664913059cc64a852fe673a8b6eb264632fefae20649a27e999d4
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        ZADeployer.exe
        • Path C:\Program Files (x86)\ZohoMeeting\UnAttended\ZADeployer.exe
        • Size 6.5MB
        • SHA256 b32b33d64a786565fe0cefdf4f8c4b457dd7110dcabf349de8a6c4023a4f2dba
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        ZohoMeeting.7z
        • Path C:\Program Files (x86)\ZohoMeeting\UnAttended\ZohoMeeting.7z
        • Size 26.9MB
        • SHA256 d6a67e507b6d53c074abca700b518403ddb9ed3a86b29a67620e9b20a627adfc
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        AgentApplicationResources.properties
        • Path C:\Program Files (x86)\ZohoMeeting\UnAttended\ZohoMeeting\Resource\Language\AgentApplicationResources.properties
        • Size 15KB
        • SHA256 730a7bb08434417e4c238e4f2b6c25c7ccda81b02392ebf99058a3f0902927c2
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        license.rtf
        • Path C:\Program Files (x86)\ZohoMeeting\UnAttended\license.rtf
        • Size 51KB
        • SHA256 6e29c59f8e107b61d26eca465ea8eaa421998af223496253bacd0c761bb99222
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        ISBEW64.exe
        • Path C:\Users\Admin\AppData\Local\Temp\{046C564E-2B3C-43EA-83A2-B39C831821DB}\ISBEW64.exe
        • Size 215KB
        • SHA256 18b2ed4d6780f2b3469a25a6f89440948e4f89005f3050418dfeeccae229d2a8
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        DIFxData.ini
        • Path C:\Users\Admin\AppData\Local\Temp\{046C564E-2B3C-43EA-83A2-B39C831821DB}\{95F1F02B-F4AB-4851-A5BF-ADDD20AA2D58}\DIFxData.ini
        • Size 84B
        • SHA256 6bc8b890884278599e4c0ca4095cefdf0f5394c5796012d169cc0933e03267a1
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        FontData.ini
        • Path C:\Users\Admin\AppData\Local\Temp\{046C564E-2B3C-43EA-83A2-B39C831821DB}\{95F1F02B-F4AB-4851-A5BF-ADDD20AA2D58}\FontData.ini
        • Size 37B
        • SHA256 a7e91b042ce33490353c00244c0420c383a837e73e6006837a60d3c174102932
        • MD5 SHA1 SHA512
        Submit Download

        _isres_0x0409.dll
        • Path C:\Users\Admin\AppData\Local\Temp\{046C564E-2B3C-43EA-83A2-B39C831821DB}\{95F1F02B-F4AB-4851-A5BF-ADDD20AA2D58}\_isres_0x0409.dll
        • Size 1.8MB
        • SHA256 3915698c45f46b27eb28881fca651d7672f90e15ca2110fd8093e1a467ef3a6a
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        _isuser_0x0409.dll
        • Path C:\Users\Admin\AppData\Local\Temp\{046C564E-2B3C-43EA-83A2-B39C831821DB}\{95F1F02B-F4AB-4851-A5BF-ADDD20AA2D58}\_isuser_0x0409.dll
        • Size 958KB
        • SHA256 73cb6b801b114650730a112676ea25d7c3b046b8334e08d332d384baed729f6f
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        isrt.dll
        • Path C:\Users\Admin\AppData\Local\Temp\{046C564E-2B3C-43EA-83A2-B39C831821DB}\{95F1F02B-F4AB-4851-A5BF-ADDD20AA2D58}\isrt.dll
        • Size 1.1MB
        • SHA256 e5b8371c09ab79573c600d2a557e99510b581abbca3c8f8d2c940855f551ccb2
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        0x0409.ini
        • Path C:\Users\Admin\AppData\Local\Temp\{6E7C0EC4-8E54-4824-A2C2-3E53BF2DD72E}\Disk1\0x0409.ini
        • Size 22KB
        • SHA256 cdb316d7f9aa2d854eb28f7a333426a55cc65fa7d31b0bdf8ae108e611583d29
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        ESign_Acrobat_Update.exe
        • Path C:\Users\Admin\AppData\Local\Temp\{6E7C0EC4-8E54-4824-A2C2-3E53BF2DD72E}\Disk1\ESign_Acrobat_Update.exe
        • Size 903KB
        • SHA256 f0991d413ccb253a009f8e3d39498d6a6006a1485d462e388f62765bdb6fef7e
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        ISSetup.dll
        • Path C:\Users\Admin\AppData\Local\Temp\{6E7C0EC4-8E54-4824-A2C2-3E53BF2DD72E}\Disk1\ISSetup.dll
        • Size 1.5MB
        • SHA256 0d439c92b38c24654df022a06ae0cb6f8acc36e066f10d9313afe7dde3260974
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        data1.cab
        • Path C:\Users\Admin\AppData\Local\Temp\{6E7C0EC4-8E54-4824-A2C2-3E53BF2DD72E}\Disk1\data1.cab
        • Size 31.8MB
        • SHA256 ea189d7248bab07b60704bf9d9605b3db4a1d18dbb0eb6f84232949ef8a87e26
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        data1.hdr
        • Path C:\Users\Admin\AppData\Local\Temp\{6E7C0EC4-8E54-4824-A2C2-3E53BF2DD72E}\Disk1\data1.hdr
        • Size 12KB
        • SHA256 72b3044d643c3ea6ae6181dfe5914607786e1e00a41f86b72872fde03d28abef
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        data2.cab
        • Path C:\Users\Admin\AppData\Local\Temp\{6E7C0EC4-8E54-4824-A2C2-3E53BF2DD72E}\Disk1\data2.cab
        • Size 803B
        • SHA256 1cf112bd9cc5c1a5b36a85e390dff3378ff940ec4f3d582b7d5124e2babe00ec
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        layout.bin
        • Path C:\Users\Admin\AppData\Local\Temp\{6E7C0EC4-8E54-4824-A2C2-3E53BF2DD72E}\Disk1\layout.bin
        • Size 550B
        • SHA256 8f4d9370c8657ad6e2848b9f8721202f6e6d33380bcc23dbfd4da37570b381c6
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        setup.inx
        • Path C:\Users\Admin\AppData\Local\Temp\{6E7C0EC4-8E54-4824-A2C2-3E53BF2DD72E}\Disk1\setup.inx
        • Size 236KB
        • SHA256 f26abc20421fcbc69638c2f70e5f08b8eb8002ca136c4ee532ace0d9fd0aee53
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        setup.ini
        • Path C:\Users\Admin\AppData\Local\Temp\{6E7C0EC4-8E54-4824-A2C2-3E53BF2DD72E}\setup.ini
        • Size 2KB
        • SHA256 6b49b797abc63a86d782a22c3112a5852dc35631d50d8661464e3ec9fe75fe43
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        InvAB4A.tmp
        • Path C:\Windows\Temp\ZohoAssist\InvAB4A.tmp
        • Size 2KB
        • SHA256 7340b02d9cceedc996840a050cb4ab21254c1c2f8ac3993a78c33bb9b1ca53df
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        ZA_A7BF.tmp
        • Path C:\Windows\Temp\ZohoAssist\ZA_A7BF.tmp
        • Size 31.1MB
        • SHA256 e3baa2d834f6cbd299e0bc2bab981a209bdd2ea0ea7f0af9d0dd8acac647d1cd
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        metadata-2
        • Path \??\GLOBALROOT\Device\HarddiskVolumeShadowCopy2\System Volume Information\SPP\metadata-2
        • Size 26.1MB
        • SHA256 49a5761472fa797b94260f77843efef9de4e960524f5ebccbb4aad92bf2b5436
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        {aca3e949-88e1-4fa0-88c1-e1e2e18fd21d}_OnDiskSnapshotProp
        • Path \??\Volume{6392210f-0000-0000-0000-d08302000000}\System Volume Information\SPP\OnlineMetadataCache\{aca3e949-88e1-4fa0-88c1-e1e2e18fd21d}_OnDiskSnapshotProp
        • Size 6KB
        • SHA256 c3cb3a0529d89ee327c1318a7c8436d9172a2e7a995786b672108da4caeed75a
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        memory/1776-99-0x0000000006340000-0x0000000006507000-memory.dmp
        Download