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Analysis

  • max time kernel
    148s
  • max time network
    151s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240802-en
  • resource tags

    arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    25/08/2024, 17:13

General

  • Target

    xcvvcxt.exe

  • Size

    71KB

  • MD5

    52d2a1a3deaeef7265f59db93f08f6a8

  • SHA1

    f149bd23adbdd98bd1eaf67960d6ea50ad9a6abb

  • SHA256

    40757554eb21a52d4700d04e7247042974e177f13370d799f115be591d16ce63

  • SHA512

    c5013a3bb4ff061c4f0e36ade32dcc86be69dbe28516600597329c0a53c467e2b2300a10196aa88d2ef97a405f9c002a87c5e64503a0242a9ecfe502eb75bc0d

  • SSDEEP

    1536:aDiF2GFihkZNcSKYjUoA6ybueXcMS2+fL6AOOAcdt+RnMX:uiXJZaPYgAybpX3S2+hOOADFMX

Malware Config

Extracted

Family

xworm

C2

reason-scoop.gl.at.ply.gg:16546

Attributes
  • Install_directory

    %LocalAppData%

  • install_file

    Java Update Scheduler.exe

Signatures

  • Detect Xworm Payload 2 IoCs
  • Xworm

    Xworm is a remote access trojan written in C#.

  • Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

    Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

  • Drops startup file 2 IoCs
  • Executes dropped EXE 3 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Enumerates physical storage devices 1 TTPs

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

  • Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious behavior: EnumeratesProcesses 9 IoCs
  • Suspicious use of AdjustPrivilegeToken 9 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 10 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:\Users\Admin\AppData\Local\Temp\xcvvcxt.exe
    "C:\Users\Admin\AppData\Local\Temp\xcvvcxt.exe"
    1⤵
    • Drops startup file
    • Adds Run key to start application
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:3468
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\xcvvcxt.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2616
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'xcvvcxt.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:328
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Java Update Scheduler.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2160
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Java Update Scheduler.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:8
    • C:\Windows\System32\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "Java Update Scheduler" /tr "C:\Users\Admin\AppData\Local\Java Update Scheduler.exe"
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:1900
  • C:\Windows\System32\rundll32.exe
    C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
    1⤵
      PID:2432
    • C:\Users\Admin\AppData\Local\Java Update Scheduler.exe
      "C:\Users\Admin\AppData\Local\Java Update Scheduler.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:3520
    • C:\Users\Admin\AppData\Local\Java Update Scheduler.exe
      "C:\Users\Admin\AppData\Local\Java Update Scheduler.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:3032
    • C:\Users\Admin\AppData\Local\Java Update Scheduler.exe
      "C:\Users\Admin\AppData\Local\Java Update Scheduler.exe"
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:4812

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Local\Java Update Scheduler.exe

      Filesize

      71KB

      MD5

      52d2a1a3deaeef7265f59db93f08f6a8

      SHA1

      f149bd23adbdd98bd1eaf67960d6ea50ad9a6abb

      SHA256

      40757554eb21a52d4700d04e7247042974e177f13370d799f115be591d16ce63

      SHA512

      c5013a3bb4ff061c4f0e36ade32dcc86be69dbe28516600597329c0a53c467e2b2300a10196aa88d2ef97a405f9c002a87c5e64503a0242a9ecfe502eb75bc0d

    • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Java Update Scheduler.exe.log

      Filesize

      654B

      MD5

      2cbbb74b7da1f720b48ed31085cbd5b8

      SHA1

      79caa9a3ea8abe1b9c4326c3633da64a5f724964

      SHA256

      e31b18f21621d9983bfdf1ea3e53884a9d58b8ffd79e0e5790da6f3a81a8b9d3

      SHA512

      ecf02d5240e0c1c005d3ab393aa7eff62bd498c2db5905157e2bf6d29e1b663228a9583950842629d1a4caef404c8941a0c7799b1a3bd1eb890a09fdb7efcff9

    • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

      Filesize

      2KB

      MD5

      627073ee3ca9676911bee35548eff2b8

      SHA1

      4c4b68c65e2cab9864b51167d710aa29ebdcff2e

      SHA256

      85b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c

      SHA512

      3c5f6c03e253b83c57e8d6f0334187dbdcdf4fa549eecd36cbc1322dca6d3ca891dc6a019c49ec2eafb88f82d0434299c31e4dfaab123acb42e0546218f311fb

    • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

      Filesize

      944B

      MD5

      e3840d9bcedfe7017e49ee5d05bd1c46

      SHA1

      272620fb2605bd196df471d62db4b2d280a363c6

      SHA256

      3ac83e70415b9701ee71a4560232d7998e00c3db020fde669eb01b8821d2746f

      SHA512

      76adc88ab3930acc6b8b7668e2de797b8c00edcfc41660ee4485259c72a8adf162db62c2621ead5a9950f12bfe8a76ccab79d02fda11860afb0e217812cac376

    • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

      Filesize

      944B

      MD5

      fb64985eb65ff03449724256acec5ab0

      SHA1

      6e65d6919e613eeb21e1efb38dc82d319fdf9bd1

      SHA256

      1c8634d4efd6aba18bd0c294f82330df95fe2611129b824a0dd108537b308f28

      SHA512

      364d9caf73d5d2180893250ba17d0611fc5baf5636284b79312e5f232c4f10b2f2c241f522276712f163d8e7124d73cc88ca077a8eb9fb39059475737daa90d3

    • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

      Filesize

      944B

      MD5

      050567a067ffea4eb40fe2eefebdc1ee

      SHA1

      6e1fb2c7a7976e0724c532449e97722787a00fec

      SHA256

      3952d5b543e5cb0cb84014f4ad9f5f1b7166f592d28640cbc3d914d0e6f41d2e

      SHA512

      341ad71ef7e850b10e229666312e4bca87a0ed9fe25ba4b0ab65661d5a0efa855db0592153106da07134d8fc2c6c0e44709bf38183c9a574a1fa543189971259

    • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_3zhmwwxe.b2o.ps1

      Filesize

      60B

      MD5

      d17fe0a3f47be24a6453e9ef58c94641

      SHA1

      6ab83620379fc69f80c0242105ddffd7d98d5d9d

      SHA256

      96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

      SHA512

      5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

    • memory/2616-19-0x00007FFE8B1B0000-0x00007FFE8BC72000-memory.dmp

      Filesize

      10.8MB

    • memory/2616-15-0x00007FFE8B1B0000-0x00007FFE8BC72000-memory.dmp

      Filesize

      10.8MB

    • memory/2616-16-0x00007FFE8B1B0000-0x00007FFE8BC72000-memory.dmp

      Filesize

      10.8MB

    • memory/2616-14-0x00007FFE8B1B0000-0x00007FFE8BC72000-memory.dmp

      Filesize

      10.8MB

    • memory/2616-13-0x00007FFE8B1B0000-0x00007FFE8BC72000-memory.dmp

      Filesize

      10.8MB

    • memory/2616-12-0x00007FFE8B1B0000-0x00007FFE8BC72000-memory.dmp

      Filesize

      10.8MB

    • memory/2616-11-0x0000027EBC500000-0x0000027EBC522000-memory.dmp

      Filesize

      136KB

    • memory/3468-0-0x00007FFE8B1B3000-0x00007FFE8B1B5000-memory.dmp

      Filesize

      8KB

    • memory/3468-51-0x00007FFE8B1B3000-0x00007FFE8B1B5000-memory.dmp

      Filesize

      8KB

    • memory/3468-56-0x00007FFE8B1B0000-0x00007FFE8BC72000-memory.dmp

      Filesize

      10.8MB

    • memory/3468-57-0x000000001C260000-0x000000001C26C000-memory.dmp

      Filesize

      48KB

    • memory/3468-2-0x00007FFE8B1B0000-0x00007FFE8BC72000-memory.dmp

      Filesize

      10.8MB

    • memory/3468-1-0x00000000007F0000-0x0000000000808000-memory.dmp

      Filesize

      96KB