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clarify how sigma matches empty and null values #178

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clarify how sigma matches empty and null values #178

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1cc7b32
chore: use jsonl ending
secDre4mer May 22, 2026
b674849
fix: clarify how null and empty fields are matched in sigma
secDre4mer May 22, 2026
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2 changes: 1 addition & 1 deletion output/encryption.rst
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Expand Up @@ -15,7 +15,7 @@ You can decrypt the logs later with THOR Util:

.. code-block:: console

nextron@unix:~$ thor-util decrypt --privkey mykey-private.pem thorlog.json
nextron@unix:~$ thor-util decrypt --privkey mykey-private.pem thorlog.jsonl

For more information about ``thor-util``, see the separate `THOR Util
manual <https://thor-util-manual.nextron-systems.com/>`__.
10 changes: 9 additions & 1 deletion signatures/sigma.rst
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Expand Up @@ -163,14 +163,22 @@ rules:
* - ``service_name``
- ``SERVICE_NAME``

To match null/empty fields:
To match null (nonexistent) fields:

.. code-block:: yaml

detection:
selection:
FILE: null

To match empty (but existent) fields:

.. code-block:: yaml

detection:
selection:
FILE: ''

Detection Examples
******************

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