Hi Folks,
I'm running into trouble excluding new process creation events for Teams from being indexed. It's an expected application and starts at logon so we're not super worried about it.
I've looked at a handful of community articles, tried what was posted, and I'm stumped. My regex syntax looks fine, but Splunk still isn't excluding the events. Here's what I've tried so far:
_____inputs.conf_____
blacklist3 = EventCode="4688" new_process_name=".*Teams.exe"
blacklist3 = $XmlRegex="<EventID>4688<\/EventID>.*<Data Name='NewProcessName'>C:\\Users\\.*\\AppData\\Local\\Microsoft\\Teams\\current\\Teams\.exe<\/Data>"
blacklist3 = $XmlRegex="<EventID>4688<\/EventID>.*<DataName='NewProcessName'>C:\\Users\\.*\\AppData\\Local\\Microsoft\\Teams\\current\\Teams\.exe<\/Data>"
blacklist3 = EventCode="4688" $XmlRegex="Name=\'NewProcessName\'>C:\\Users\\.*\\AppData\\Local\\Microsoft\\Teams\\current\\Teams.exe<\/Data>"
None of these have worked. I found a couple community articles saying props.conf and transforms.conf was the proper way to filter out events so I tried these as well:
_____props.conf_____
[WinEventLog:Security]
TRANSFORMS-null = 4688cleanup
_____transforms.conf_____
[4688cleanup]
REGEX = "Teams\.exe<\/Data>"
DEST_KEY = queue
FORMAT = nullQueue
And this:
_____transforms.conf_____
[4688cleanup]
REGEX = <EventID>4688<\/EventID>.*<DataName='NewProcessName'>C:\\Users\\.*\\AppData\\Local\\Microsoft\\Teams\\current\\Teams\.exe<\/Data>
DEST_KEY = queue
FORMAT = nullQueue
None of these have worked so far and I'd appreciate any input y'all have.
Here is a copy of an event I'm trying to exclude from being indexed (Teams.exe as a new process):
<Event xmlns='http:// schemas .microsoft .com/win/2004/08/events/event '><System><Provider Name='Microsoft-Windows-Security-Auditing' Guid='{54849625-5478-4994-a5ba-3e3b0328c30d}'/><EventID>4688</EventID><Version>2</Version><Level>0</Level><Task>13312</Task><Opcode>0</Opcode><Keywords>0x8020000000000000</Keywords><TimeCreated SystemTime='2024-02-21T22:11:25.7542758Z'/><EventRecordID>4096881</EventRecordID><Correlation/><Execution ProcessID='4' ThreadID='1124'/><Channel>Security</Channel><Computer>{Device_FQDN}</Computer><Security/></System><EventData><Data Name='SubjectUserSid'>S-1-1-11-111111111-111111111-1111111111-111111</Data><Data Name='SubjectUserName'>{user}</Data><Data Name='SubjectDomainName'>{Domain}</Data><Data Name='SubjectLogonId'>0x11111111</Data><Data Name='NewProcessId'>0x5864</Data><Data Name='NewProcessName'>C:\Users\{user}\AppData\Local\Microsoft\Teams\current\Teams.exe</Data><Data Name='TokenElevationType'>%%1936</Data><Data Name='ProcessId'>0x4604</Data><Data Name='CommandLine'></Data><Data Name='TargetUserSid'>S-1-0-0</Data><Data Name='TargetUserName'>-</Data><Data Name='TargetDomainName'>-</Data><Data Name='TargetLogonId'>0x0</Data><Data Name='ParentProcessName'>C:\Users\{user}\AppData\Local\Microsoft\Teams\current\Teams.exe</Data><Data Name='MandatoryLabel'>S-1-11-1111</Data></EventData></Event>
And a copy of an event we'd like to keep (Teams.exe as a parent process, but not the new process):
<Event xmlns='http:// schemas .microsoft .com/win/2004/08/events/event '><System><Provider Name='Microsoft-Windows-Security-Auditing' Guid='{54849625-5478-4994-a5ba-3e3b0328c30d}'/><EventID>4688</EventID><Version>2</Version><Level>0</Level><Task>13312</Task><Opcode>0</Opcode><Keywords>0x8020000000000000</Keywords><TimeCreated SystemTime='2024-02-21T22:33:19.5932251Z'/><EventRecordID>4212468</EventRecordID><Correlation/><Execution ProcessID='4' ThreadID='31196'/><Channel>Security</Channel><Computer>{Device_FQNDN</Computer><Security/></System><EventData><Data Name='SubjectUserSid'>S-1-1-11-111111111-111111111-1111111111-111111</Data><Data Name='SubjectUserName'>{user}</Data><Data Name='SubjectDomainName'>{Domain}</Data><Data Name='SubjectLogonId'>0x1111111</Data><Data Name='NewProcessId'>0x7664</Data><Data Name='NewProcessName'>C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe</Data><Data Name='TokenElevationType'>%%1936</Data><Data Name='ProcessId'>0x4238</Data><Data Name='CommandLine'></Data><Data Name='TargetUserSid'>S-1-0-0</Data><Data Name='TargetUserName'>-</Data><Data Name='TargetDomainName'>-</Data><Data Name='TargetLogonId'>0x0</Data><Data Name='ParentProcessName'>C:\Users\{user}\AppData\Local\Microsoft\Teams\current\Teams.exe</Data><Data Name='MandatoryLabel'>S-1-11-1111</Data></EventData></Event>
Events obfuscated for privacy. Like I said, the regex syntax looks fine as far as I can tell and matches in regex101 so I'm hoping it's a small thing I'm overlooking. We're running Splunk v9.1.1 if that makes any difference. Thanks!
-SplunkUser5
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