OilRig has also used certutil to decode base64-encoded files on victims. $data = ::ReadAllBytes("$($outdir)\CA-chain.p7b")įoreach ($certificate in $cms. A OilRig macro has run a PowerShell command to decode file contents. $certutilargs = &certutil.exe $certutilargs I used the example code in the link Daisy provided and created the following code, which will do for the moment: $outdir = "D:\temp" While above solution probably works just fine, I would like to do this in a more elegant way, directly in powershell without using certutil.Īny ideas on how I could accomplish this? Feel free to give me feedback on these consolidated documents.
I took all the older links that I could find and pointed them to the locations above and then pointed out to the examples that we have already. I have consolidated and updated two command line utilities recently: Certreq.
#Certutil decode base64 how to
$cms.Certificates | foreach | echoīut I'm not sure how to re-write that to give me the base64 output of each certificate. First published on TECHNET on Mar 08, 2013. Here they are: certutil -encodehex -f strings64.exe strings12. So you can pass an additional number as a format flag. Note that there are two additional command switches that may be used - encodehex and decodehex. 1 by npocmaka » 12:07 Here the SO user showed me a not so well documented additional switch of the certutil -encodehex. Once decoded, it will be loaded by a parallel process. Malicious usage will include decoding a encoded file that was downloaded. But you can use the built-in command 'certutil -encode/-decode' to indirectly perform Base64 encoding and decoding. $data = ::ReadAllBytes("certificates.p7b") Encoding will convert a file to base64 with -BEGIN CERTIFICATE- and -END CERTIFICATE- tags. If you are using a Windows system, there is no built-in command to directly perform Base64 encoding and decoding.
I could probably extract the root and intermediate CA certificates in base64 from this file somehow, if I only knew how.
I want to export the root and intermediate CA certificates in base64 format using powershell on the intermediate CA.Ĭertutil has the switch "-ca.chain" which gives me the root and intermediate certificates in PKCS7 format.
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