diff --git a/salt/elasticsearch/defaults.yaml b/salt/elasticsearch/defaults.yaml
index f67a01df9..c8ceab34d 100644
--- a/salt/elasticsearch/defaults.yaml
+++ b/salt/elasticsearch/defaults.yaml
@@ -3309,6 +3309,7 @@ elasticsearch:
         composed_of:
         - event-mappings
         - logs-system.security@package
+        - so-fleet_system.security_caseless-1
         - logs-system.security@custom
         - so-fleet_integrations.ip_mappings-1
         - so-fleet_globals-1
@@ -4175,6 +4176,7 @@ elasticsearch:
       index_template:
         composed_of:
         - logs-windows.forwarded@package
+        - so-fleet_process_caseless-1
         - logs-windows.forwarded@custom
         - so-fleet_integrations.ip_mappings-1
         - so-fleet_globals-1
@@ -4224,6 +4226,7 @@ elasticsearch:
       index_template:
         composed_of:
         - logs-windows.powershell@package
+        - so-fleet_process_caseless-1
         - logs-windows.powershell@custom
         - so-fleet_integrations.ip_mappings-1
         - so-fleet_globals-1
@@ -4273,6 +4276,7 @@ elasticsearch:
       index_template:
         composed_of:
         - logs-windows.powershell_operational@package
+        - so-fleet_process_caseless-1
         - logs-windows.powershell_operational@custom
         - so-fleet_integrations.ip_mappings-1
         - so-fleet_globals-1
@@ -4322,6 +4326,7 @@ elasticsearch:
       index_template:
         composed_of:
         - logs-windows.sysmon_operational@package
+        - so-fleet_process_caseless-1
         - logs-windows.sysmon_operational@custom
         - so-fleet_integrations.ip_mappings-1
         - so-fleet_globals-1
diff --git a/salt/elasticsearch/templates/component/elastic-agent/so-fleet_process_caseless-1.json b/salt/elasticsearch/templates/component/elastic-agent/so-fleet_process_caseless-1.json
new file mode 100644
index 000000000..37b6413e9
--- /dev/null
+++ b/salt/elasticsearch/templates/component/elastic-agent/so-fleet_process_caseless-1.json
@@ -0,0 +1,123 @@
+{
+  "_meta": {
+    "managed_by": "security_onion",
+    "managed": true,
+    "description": "Adds .caseless for Lucene queries. Restates each field's package type and .text."
+  },
+  "template": {
+    "mappings": {
+      "properties": {
+        "process": {
+          "properties": {
+            "executable": {
+              "type": "keyword",
+              "ignore_above": 1024,
+              "fields": {
+                "caseless": {
+                  "type": "keyword",
+                  "ignore_above": 1024,
+                  "normalizer": "lowercase"
+                },
+                "text": {
+                  "type": "match_only_text"
+                }
+              }
+            },
+            "name": {
+              "type": "keyword",
+              "ignore_above": 1024,
+              "fields": {
+                "caseless": {
+                  "type": "keyword",
+                  "ignore_above": 1024,
+                  "normalizer": "lowercase"
+                },
+                "text": {
+                  "type": "match_only_text"
+                }
+              }
+            },
+            "command_line": {
+              "type": "wildcard",
+              "ignore_above": 1024,
+              "fields": {
+                "caseless": {
+                  "type": "keyword",
+                  "ignore_above": 1024,
+                  "normalizer": "lowercase"
+                },
+                "text": {
+                  "type": "match_only_text"
+                }
+              }
+            },
+            "parent": {
+              "properties": {
+                "executable": {
+                  "type": "keyword",
+                  "ignore_above": 1024,
+                  "fields": {
+                    "caseless": {
+                      "type": "keyword",
+                      "ignore_above": 1024,
+                      "normalizer": "lowercase"
+                    },
+                    "text": {
+                      "type": "match_only_text"
+                    }
+                  }
+                },
+                "name": {
+                  "type": "keyword",
+                  "ignore_above": 1024,
+                  "fields": {
+                    "caseless": {
+                      "type": "keyword",
+                      "ignore_above": 1024,
+                      "normalizer": "lowercase"
+                    },
+                    "text": {
+                      "type": "match_only_text"
+                    }
+                  }
+                },
+                "command_line": {
+                  "type": "wildcard",
+                  "ignore_above": 1024,
+                  "fields": {
+                    "caseless": {
+                      "type": "keyword",
+                      "ignore_above": 1024,
+                      "normalizer": "lowercase"
+                    },
+                    "text": {
+                      "type": "match_only_text"
+                    }
+                  }
+                }
+              }
+            }
+          }
+        },
+        "file": {
+          "properties": {
+            "path": {
+              "type": "keyword",
+              "ignore_above": 1024,
+              "fields": {
+                "caseless": {
+                  "type": "keyword",
+                  "ignore_above": 1024,
+                  "normalizer": "lowercase"
+                },
+                "text": {
+                  "type": "match_only_text"
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/salt/elasticsearch/templates/component/elastic-agent/so-fleet_system.security_caseless-1.json b/salt/elasticsearch/templates/component/elastic-agent/so-fleet_system.security_caseless-1.json
new file mode 100644
index 000000000..d320364fb
--- /dev/null
+++ b/salt/elasticsearch/templates/component/elastic-agent/so-fleet_system.security_caseless-1.json
@@ -0,0 +1,80 @@
+{
+  "_meta": {
+    "managed_by": "security_onion",
+    "managed": true,
+    "description": "Adds .caseless for Lucene queries. Keeps each field's existing keyword type."
+  },
+  "template": {
+    "mappings": {
+      "properties": {
+        "process": {
+          "properties": {
+            "command_line": {
+              "type": "keyword",
+              "ignore_above": 1024,
+              "fields": {
+                "caseless": {
+                  "type": "keyword",
+                  "ignore_above": 1024,
+                  "normalizer": "lowercase"
+                }
+              }
+            },
+            "parent": {
+              "properties": {
+                "executable": {
+                  "type": "keyword",
+                  "ignore_above": 1024,
+                  "fields": {
+                    "caseless": {
+                      "type": "keyword",
+                      "ignore_above": 1024,
+                      "normalizer": "lowercase"
+                    }
+                  }
+                },
+                "name": {
+                  "type": "keyword",
+                  "ignore_above": 1024,
+                  "fields": {
+                    "caseless": {
+                      "type": "keyword",
+                      "ignore_above": 1024,
+                      "normalizer": "lowercase"
+                    }
+                  }
+                },
+                "command_line": {
+                  "type": "keyword",
+                  "ignore_above": 1024,
+                  "fields": {
+                    "caseless": {
+                      "type": "keyword",
+                      "ignore_above": 1024,
+                      "normalizer": "lowercase"
+                    }
+                  }
+                }
+              }
+            }
+          }
+        },
+        "file": {
+          "properties": {
+            "path": {
+              "type": "keyword",
+              "ignore_above": 1024,
+              "fields": {
+                "caseless": {
+                  "type": "keyword",
+                  "ignore_above": 1024,
+                  "normalizer": "lowercase"
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/salt/soc/files/soc/sigma_playbook_pipeline.yaml b/salt/soc/files/soc/sigma_playbook_pipeline.yaml
index a779c4dec..6d428d2a8 100644
--- a/salt/soc/files/soc/sigma_playbook_pipeline.yaml
+++ b/salt/soc/files/soc/sigma_playbook_pipeline.yaml
@@ -2,7 +2,6 @@ name: Security Onion - Playbook Pipeline
 priority: 97
 transformations:
     # Route to lowercase-normalized .caseless subfields for case-insensitive matching.
-    # file.path.caseless exists on Defend only (Sysmon file events lack it);
     # registry.path / dll.path / file.name have no .caseless on any source.
     - id: case_insensitive_string_fields
       type: field_name_mapping
diff --git a/salt/soc/files/soc/sigma_so_pipeline.yaml b/salt/soc/files/soc/sigma_so_pipeline.yaml
index ae867be49..23348860d 100644
--- a/salt/soc/files/soc/sigma_so_pipeline.yaml
+++ b/salt/soc/files/soc/sigma_so_pipeline.yaml
@@ -26,6 +26,16 @@ transformations:
       type: set_state
       key: keep
       val: "_id, _index, _source"
+    # Not every source maps .caseless; EQL/ES|QL already match case-insensitively.
+    - id: caseless_to_parent_fields
+      type: field_name_mapping
+      mapping:
+        process.executable.caseless: process.executable
+        process.name.caseless: process.name
+        process.parent.executable.caseless: process.parent.executable
+        process.parent.name.caseless: process.parent.name
+        target.process.executable.caseless: target.process.executable
+        target.process.name.caseless: target.process.name
     - id: baseline_field_name_mapping
       type: field_name_mapping
       mapping: