These certs include the xdr root ca and intermediate from XDR WWW Certificates Subordinate CA v2 in AWS. I also grabbed the MDR Root CA G1. The Splunk Common CA is the last cert.
custom_CA.inc
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIGJTCCBA2gAwIBAgIUcUQCVA7Avwnb2KrvgYnz8CLJ3pwwDQYJKoZIhvcNAQEL
BQAwgZkxCzAJBgNVBAYTAlVTMREwDwYDVQQIDAhWaXJnaW5pYTEQMA4GA1UEBwwH
RmFpcmZheDEjMCEGA1UECgwaQWNjZW50dXJlIEZlZGVyYWwgU2VydmljZXMxJzAl
BgNVBAsMHk1hbmFnZWQgRGV0ZWN0aW9uIGFuZCBSZXNwb25zZTEXMBUGA1UEAwwO
TURSIFJvb3QgQ0EgRzEwHhcNMjAwMzA0MTczMzA0WhcNNDAwMjI4MTczMzA0WjCB
mTELMAkGA1UEBhMCVVMxETAPBgNVBAgMCFZpcmdpbmlhMRAwDgYDVQQHDAdGYWly
ZmF4MSMwIQYDVQQKDBpBY2NlbnR1cmUgRmVkZXJhbCBTZXJ2aWNlczEnMCUGA1UE
CwweTWFuYWdlZCBEZXRlY3Rpb24gYW5kIFJlc3BvbnNlMRcwFQYDVQQDDA5NRFIg
Um9vdCBDQSBHMTCCAiIwDQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIBAK3JMDyi
7cvfc+HghS2KfJnIEU4gCggkWoSdsqJTQgFqba8hVaMKWBqX9hdEUD/VVUly1102
qYzrUnIuw/MP0TsIq2F2nLIo4DgzkQDrwlhJ2PR521i+G/zbPbWHGMY3iigyF8dq
xsiDcRVGzowfAWXOXIheu0PEmebXNG1v31qmY9jIEm2XBioN1Sw9EXnIQ/KKGRZw
inUB7tQ5sQdut5vBkwdXnJ1DqHs3G8YoKFlBHwtBO6D35yvV9x+kIo8swc1ZLX2s
C5zqUfRegJauuyAKs3jMKv+46h/+tNY50WiWxq3OtYAufWAB/mugCl6qXwMgh954
fuj/Ae9UKGsPdFJqEOeaM8vICkr8+emfKsNOvQRo8BXcsWcbewxths0Gwtg52IoB
Ds9/FuGObTD93nFBDjBSzFXtRUTUesS/tipD4Xq5eU3bAGn/NlZsKIICFgjlojQd
NmmHBpR6qXJa9u+ude006I4wvasVg/DjT84N9uAslnosru45gLbtq87bSAkHZ/yX
LZ+VtId5X3lQkrXrnhF7HTNEdxDGEJVEmsyiZ97KqDnE6Z0P365cOr6Azn4CBH8M
AhCTys3FxtY1yiNgK31PfqhD9x8sYiik9VVr9wlhSJfknb4m7gfFzhC3XE0Sg9e8
cuNyVTeDgFu0zik/DeluvTASjkUVQz8Yp4kpAgMBAAGjYzBhMB0GA1UdDgQWBBRN
5wVAfulvKor9WuSXt2wTaAKdLTAfBgNVHSMEGDAWgBRN5wVAfulvKor9WuSXt2wT
aAKdLTAPBgNVHRMBAf8EBTADAQH/MA4GA1UdDwEB/wQEAwIBhjANBgkqhkiG9w0B
AQsFAAOCAgEACm4nmg4MnWkSNT6uIoBNr32jGkuclPOErsL4u/geUgLdXtet/eQv
9cYNmb9KbzbR1dcM1Gp0vpnQy/i01Hylwo4qEgYd8J0ejS40do0jPGhai6fbIdOl
uOlOueVA5zYX2dmal3BLUpqoCOf3ewuxh6YljPmSiyv9Rmwpcsq3SiOqMabFKQ71
PQWZeVPoE9go2IV+6W2OtRNEOSZWUbYulYC39M4AU3XExjV5cq0FKiV3UNk3wEs8
uNaU3p3s5jatS/+6w/zqgdN6NtGIB0WVxT7csGN4UdU7YUWAcM03mDEb2jbXuav3
XbFDS26UyK84DQbat4OC00rQ9CipP1QKf5MlXkfjYvEcfW7zx/3Sg5Ep56xHbX3H
MuJbqmywhuuUPREEWWIii6BY3O0QgZIs2lGvqzvSifYok0eYoJfXk1tnZkFKzxVT
8miXSOepnXUAhgAaQUhDFb3l0weUW3HdK21hSwf1QpV60Yo0svjffbzPfQnydGZL
l2ybCdf6Gr6nxQZuDy2Ipg6nn+PHgdExijsdsaWHwJ2ql4vDK6sgxFyzfHS6sHwL
zNYfQ73J6FrTCJlcHCXKMGad07Jkd5y6N9za4MiZ7/Zw/NKNaRIdym6aEeNS7N9O
ahHDgZnPWV/ZNudKV6pqKZbxyUIHYf4CRA4Z+JKqauY4LpyVWNdW64c=
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIDejCCAmICCQCNHBN8tj/FwzANBgkqhkiG9w0BAQsFADB/MQswCQYDVQQGEwJV
UzELMAkGA1UECAwCQ0ExFjAUBgNVBAcMDVNhbiBGcmFuY2lzY28xDzANBgNVBAoM
BlNwbHVuazEXMBUGA1UEAwwOU3BsdW5rQ29tbW9uQ0ExITAfBgkqhkiG9w0BCQEW
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NTRaMH8xCzAJBgNVBAYTAlVTMQswCQYDVQQIDAJDQTEWMBQGA1UEBwwNU2FuIEZy
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9w0BAQEFAAOCAQ8AMIIBCgKCAQEAzB9ltVEGk73QvPlxXtA0qMW/SLDQlQMFJ/C/
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5xI5Qxu3rcCxkKQuwz9KRe4iijOIRMAKX28pbakxU9Nk38Ac3PNadgIk0s7R829k
980sqGWkd06+C17OxgjpQbvLOR20FtmQybttUsXGR7Bp07YStwIDAQABMA0GCSqG
SIb3DQEBCwUAA4IBAQCxhQd6KXP2VzK2cwAqdK74bGwl5WnvsyqdPWkdANiKksr4
ZybJZNfdfRso3fA2oK1R8i5Ca8LK3V/UuAsXvG6/ikJtWsJ9jf+eYLou8lS6NVJO
xDN/gxPcHrhToGqi1wfPwDQrNVofZcuQNklcdgZ1+XVuotfTCOXHrRoNmZX+HgkY
gEtPG+r1VwSFowfYqyFXQ5CUeRa3JB7/ObF15WfGUYplbd3wQz/M3PLNKLvz5a1z
LMNXDwN5Pvyb2epyO8LPJu4dGTB4jOGpYLUjG1UUqJo9Oa6D99rv6sId+8qjERtl
ZZc1oaC0PKSzBmq+TpbR27B8Zra3gpoA+gavdRZj
-----END CERTIFICATE-----
custom_feed_info.inc
PLUGIN_SET = "202109011330";
PLUGIN_FEED = "Custom";
Create a compressed tar archive of the 2 files: (Note: Applications such as 7-Zip or running the tar command on macOS are known not to work for this)
tar -zcvf upload_this.tar.gz custom_feed_info.inc custom_CA.inc