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responses

Hy!

Sometimes one has to analyze Microsoft events containing EventData fields including Data fields without name, or let's say unnamed Data fields, e.g. EventID 2889 - unsigned LDAP requests.

- <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
- <System>
  <Provider Name="Microsoft-Windows-ActiveDirectory_DomainService" Guid="{0e84...-3605-4e8c-...-1e730c959516}" EventSourceName="NTDS General" /> 
  <EventID Qualifiers="16384">2889</EventID> 
  <Version>0</Version> 
  <Level>4</Level> 
  <Task>16</Task> 
  <Opcode>0</Opcode> 
  <Keywords>0x8080000000000000</Keywords> 
  <TimeCreated SystemTime="2020-02-18T13:27:25.716041000Z" /> 
  <EventRecordID>242410</EventRecordID> 
  <Correlation /> 
  <Execution ProcessID="436" ThreadID="1108" /> 
  <Channel>Directory Service</Channel> 
  <Computer>PC1.DOMAINXY.local</Computer> 
  <Security UserID="S-1-5-7-..." /> 
  </System>
- <EventData>
  <Data>172.172.172.172:33426</Data> 
  <Data>DOMAINXY\USERXY</Data> 
  <Data>0</Data> 
  </EventData>
  </Event>

Simply sending this to syslog works like charm. But in this case I woul like to get the values from all three fields into $raw_event with a special text,like:

define EventID_2889_REGEX /(?x) \
    <Data>(?<IP>(^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$))<\/Data> \
    <Data>(?<USER>([\w\d]+))<\/Data> \
    <Data>(?<BINDTYPE>(\d+))<\/Data>/
<Input eventlog2889>
Module im_msvistalog
Query <QueryList>\
 <Query Id="0" Path="Directory Service">\
  <Select Path="Directory Service">*[System[(EventID=2889)]]</Select>\
 </Query>\
</QueryList>
Exec $EventData =~ %EventID_2889_REGEX%;
Exec $raw_event = "Unsigned or simple non TLS LDAP bind request: [" + $EventData + "]";
Exec $SyslogFacilityValue = 21;
Exec $SyslogFacility = "LOCAL5";
Exec $ProcessID = $SubjectUserName;
Exec $SourceName = "2889";
Exec parse_syslog_ietf();
Exec to_syslog_ietf();
</Input>

I tried a lot, read the NXLog CE documentation hints, googled for days now...to list it all up here would explode the forum ;-) Could you please give me some hints how to process these values? Maybe this is not even possible in NXLog CE, see https://nxlog.co/question/4158/windows-eventdata-not-captured?

Thanks in advance!

AskedApril 22, 2020 - 11:26am

Answer (1)