Splunk Search

Sysmon Event Parsing

suspicious_link
New Member

I'm having trouble getting all the fields from sysmon automatically parse with the microsoft sysmon add in could someone tell me what i might be missing?

The events are coming into my home splunk instance (8.2.2) but not being fully parsed correctly, I'm pretty sure i need to use a transform, but the one I've tried isn't working (I'm pretty sure i did it wrong but *shrug* no idea if i did or not)

I've installed sysmon on my home computer and have the universal forwarder pointed to my home splunk instance.

I followed the guide i found here: https://hurricanelabs.com/splunk-tutorials/splunking-with-sysmon-series-part-1-the-setup/

As you can see in the screenshot it only extracted some of the fields and the IMPHASH value carried over into some other data.
suspicious_link_0-1633474317729.png

 

inputs.conf for sysmon

 

 

 

[WinEventLog://Microsoft-Windows-Sysmon/Operational]
disabled = false
renderXml = true
source = XMLWinEventLog:Microsoft-Windows-Sysmon/Operational

 

output of my transform with the path:

 

cat /opt/splunk/etc/apps/search/default/transforms.conf

[geo_us_states]
external_type = geo
filename = geo_us_states.kmz

[geo_countries]
external_type = geo
filename = geo_countries.kmz

[geo_attr_us_states]
filename = geo_attr_us_states.csv

[geo_attr_countries]
filename = geo_attr_countries.csv

[geo_hex]
external_type=geo_hex

[xmlwineventlog]
REGEX = "Data Name\=\'(?<_KEY_1>[A-Za-z]+)\'>(?<_VAL_1>[^<]+)<\/Data>"
DELIMS = "'>"

 

 

 

Here's a sample event straight from _raw (looked this event over nothing seemed overly sensitive)

 

 

 

<Event xmlns='http://schemas.microsoft.com/win/2004/08/events/event'><System><Provider Name='Microsoft-Windows-Sysmon' Guid='{5770385f-c22a-43e0-bf4c-06f5698ffbd9}'/><EventID>1</EventID><Version>5</Version><Level>4</Level><Task>1</Task><Opcode>0</Opcode><Keywords>0x8000000000000000</Keywords><TimeCreated SystemTime='2021-10-05T22:36:40.9004216Z'/><EventRecordID>7090</EventRecordID><Correlation/><Execution ProcessID='5908' ThreadID='7428'/><Channel>Microsoft-Windows-Sysmon/Operational</Channel><Computer>eelo</Computer><Security UserID='S-1-5-18'/></System><EventData><Data Name='RuleName'>-</Data><Data Name='UtcTime'>2021-10-05 22:36:40.899</Data><Data Name='ProcessGuid'>{ce4bb586-d378-615c-5b1e-000000007100}</Data><Data Name='ProcessId'>10476</Data><Data Name='Image'>C:\Program Files\SplunkUniversalForwarder\bin\splunk-powershell.exe</Data><Data Name='FileVersion'>-</Data><Data Name='Description'>-</Data><Data Name='Product'>-</Data><Data Name='Company'>-</Data><Data Name='OriginalFileName'>-</Data><Data Name='CommandLine'>"C:\Program Files\SplunkUniversalForwarder\bin\splunk-powershell.exe"</Data><Data Name='CurrentDirectory'>C:\WINDOWS\system32\</Data><Data Name='User'>NT AUTHORITY\SYSTEM</Data><Data Name='LogonGuid'>{ce4bb586-a1ce-615c-e703-000000000000}</Data><Data Name='LogonId'>0x3e7</Data><Data Name='TerminalSessionId'>0</Data><Data Name='IntegrityLevel'>System</Data><Data Name='Hashes'>MD5=1F8722C371906F7B659FA38B39B21661,SHA256=383581B2E6BE7003CCCC0DAFAE75CBA3B0885C441ACDBD9AE76EAAFD9602A022,IMPHASH=1BDECF92268D3D3EF70015DDFEB0FFB9</Data><Data Name='ParentProcessGuid'>{ce4bb586-d191-615c-2a1d-000000007100}</Data><Data Name='ParentProcessId'>18812</Data><Data Name='ParentImage'>C:\Program Files\SplunkUniversalForwarder\bin\splunkd.exe</Data><Data Name='ParentCommandLine'>"C:\Program Files\SplunkUniversalForwarder\bin\splunkd.exe" service</Data></EventData></Event>

 

 

 

Labels (3)
0 Karma

suspicious_link
New Member

i think i fixed it on my own, i had some other sysmon apps installed and disabled all but Splunk_TA_microsoft_sysmon 

AND installed


Splunk Add-on for Microsoft Windows (pretty sure this is what did it)

0 Karma
Get Updates on the Splunk Community!

Stay Connected: Your Guide to February Tech Talks, Office Hours, and Webinars!

&#x1f48c; Keep the new year’s momentum going with our February lineup of Community Office Hours, Tech Talks, ...

Preparing your Splunk Environment for OpenSSL3

The Splunk platform will transition to OpenSSL version 3 in a future release. Actions are required to prepare ...

Incident Response: Reduce Incident Recurrence with Automated Ticket Creation

Culture extends beyond work experience and coffee roast preferences on software engineering teams. Team ...