Feature/risk level condition#45 (#186)

* add risk level filter arguments #45

* fix default level in help #45

* add test yaml files #45

* refactoring and fix level argument usage.

* cargo fmt --all

Co-authored-by: ichiichi11 <takai.wa.hajime@gmail.com>

test_files/rules/level_yaml/critical.yml

@@ -0,0 +1,19 @@
+title: Sysmon Check command lines
+description: hogehoge
+enabled: true
+author: Yea
+logsource: 
+    product: windows
+detection:
+    selection:
+        EventLog: Sysmon
+        EventID: 1
+        CommandLine: '*'
+    condition: selection
+falsepositives:
+    - unknown
+level: critical
+output: 'CommandLine=%CommandLine%¥nParentImage=%ParentImage%'
+creation_date: 2020/11/8
+updated_date: 2020/11/8
+

test_files/rules/level_yaml/high.yml

@@ -0,0 +1,19 @@
+title: Sysmon Check command lines
+description: hogehoge
+enabled: true
+author: Yea
+logsource: 
+    product: windows
+detection:
+    selection:
+        EventLog: Sysmon
+        EventID: 1
+        CommandLine: '*'
+    condition: selection
+falsepositives:
+    - unknown
+level: high
+output: 'CommandLine=%CommandLine%¥nParentImage=%ParentImage%'
+creation_date: 2020/11/8
+updated_date: 2020/11/8
+

test_files/rules/level_yaml/info.yml

@@ -0,0 +1,19 @@
+title: Sysmon Check command lines
+description: hogehoge
+enabled: true
+author: Yea
+logsource: 
+    product: windows
+detection:
+    selection:
+        EventLog: Sysmon
+        EventID: 1
+        CommandLine: '*'
+    condition: selection
+falsepositives:
+    - unknown
+level: info
+output: 'CommandLine=%CommandLine%¥nParentImage=%ParentImage%'
+creation_date: 2020/11/8
+updated_date: 2020/11/8
+

test_files/rules/level_yaml/low.yml

@@ -0,0 +1,19 @@
+title: Sysmon Check command lines
+description: hogehoge
+enabled: true
+author: Yea
+logsource: 
+    product: windows
+detection:
+    selection:
+        EventLog: Sysmon
+        EventID: 1
+        CommandLine: '*'
+    condition: selection
+falsepositives:
+    - unknown
+level: low
+output: 'CommandLine=%CommandLine%¥nParentImage=%ParentImage%'
+creation_date: 2020/11/8
+updated_date: 2020/11/8
+

test_files/rules/level_yaml/medium.yml

@@ -0,0 +1,19 @@
+title: Sysmon Check command lines
+description: hogehoge
+enabled: true
+author: Yea
+logsource: 
+    product: windows
+detection:
+    selection:
+        EventLog: Sysmon
+        EventID: 1
+        CommandLine: '*'
+    condition: selection
+falsepositives:
+    - unknown
+level: medium
+output: 'CommandLine=%CommandLine%¥nParentImage=%ParentImage%'
+creation_date: 2020/11/8
+updated_date: 2020/11/8
+