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Added logic to improve Sysmon KQL generation #126

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Added logic to improve Sysmon KQL generation #126

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b0b7735
Generate typed fields for Sysmon to prevent unnecessary typecasting i…
0xffhh Oct 25, 2022
9c2b172
Fixed an annoyance in the Sysmon schema, where the casing for GUID in…
0xffhh Oct 25, 2022
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14 changes: 13 additions & 1 deletion resources/scripts/ossemSysmonKQLParser.py
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Original file line number Diff line number Diff line change
Expand Up @@ -82,8 +82,9 @@
for field in fieldlist:
log.debug('Field Name: {}'.format(field['name']))
field_name = dict()
field_name['name'] = field['name']
field_name['name'] = field['name'] if ("GUID" not in field['name']) else field['name'].replace('GUID', 'Guid')
field_name['index'] = count
field_name['type'] = field['inType']
sysmon_event['events'].append(field_name)
count += 1
all_sysmon.append(sysmon_event)
Expand All @@ -95,6 +96,17 @@
for field in sysevent['events']:
if field['name'] not in unique_fields:
unique_fields.append(field['name'])
if (field['type'].startswith("win:UInt") or
field['type'].startswith("win:HexInt")):
field['type'] = "toint"
elif (field['type'] == "win:UnicodeString" or
field['type'] == "win:GUID"):
field['type'] = "tostring"
elif (field['type'] == "win:Boolean"):
field['type'] = "tobool"
else:
field['type'] = "" #make it backwards and forwards compatible so it doesn't break


# ******** Open Sysmon KQL Parser template ****************
sysmon_parser_template = os.path.join(os.path.dirname(__file__), "templates/kql/sysmon_parser.txt")
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2 changes: 1 addition & 1 deletion resources/scripts/templates/kql/sysmon_parser.txt
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Expand Up @@ -24,7 +24,7 @@ let EventData = Event
let {{event['name']}}_{{event['id']}}{% raw %}=() {
let processEvents = EventData
| where EventID == {% endraw %}{{event['id']}}
| extend {% for field in event['events'] if field['name'] not in ['Hashes','Hash'] %}{{field['name']}}{% raw %} = EventDetail.[{% endraw %}{{field['index']}}{% raw %}].["#text"]{% endraw %}{{ ", " if not loop.last else "" }}
| extend {% for field in event['events'] if field['name'] not in ['Hashes','Hash'] %}{{field['name']}}{% raw %} = {% endraw %}{{field['type']}}{% raw %}(EventDetail.[{% endraw %}{{field['index']}}{% raw %}].["#text"]){% endraw %}{{ ", " if not loop.last else "" }}
{% endfor -%}
{% for field in event['events'] -%}
{% if field['name'] in ['Hashes','Hash'] -%}
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