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The base64 custom search command is a command that does Base64 encoding and decoding.

The base64 custom search command is a command that do Base64 encoding and decoding.

... | base64 field=your_field [action=(encode|decode)] [mode=(replace|append)] [suppress_error=(True|False)]
  • field : field to encode or decode.
  • action : encode (default) or decode the content. Optional.
  • mode : replace the existing field content (default) or create a new field named base64 (mode append). Optional.
  • suppress_error : do not raise errors if set to True. Optional, default to False.

Note on decoding:

While the input string can be anything for the encoding operation, it should respect the alphabet [a-zA-Z0-9/=] and its length should be a multiple of 4 while decoding. If the format is not respected, the command will throw errors (except if you set the flag suppress_error).

In the following example, we assume we are working on proxy/web logs and those will contains a field uri. This field will contains URI links and some of them will contains
an argument plop which refer to Base64 encoded data.

So, to get it working:

  • filter the results
  • extract the base64 content (command rex)
  • evaluate the length of the base64 content to avoid content with a wrong padding
  • decode the base64 content

Here is one way of doing it in Splunk:

... your search to get field 'uri' for example...

| fields uri

| rex field=uri "plop=(?<content_to_decode>[a-zA-Z0-9/=]*)”

| eval clength=len(content_to_decode)%4

| search clength=0

| base64 field=“content_to_decode" action=“decode" mode=“append"



  • Avoid errors by adding padding
  • Less ambiguous escaped output
  • Optional charset when decoding
  • Lookups with default options
  • Return original event if input field does not exist
  • MIME decoding for base64 encoded MIME
  • Workaround for leading spaces

- non printable characters are presented as hexadecimal when decoding (ex: base64=<%PDF\x00\x00).
- Initial release

Release Notes

Version 1.1
Sept. 21, 2015
Version 1.0.3
Feb. 12, 2015
Version 1.0.0
Dec. 8, 2014

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