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Deleting Group (Red Hat Enterprise Linux Server 6)

Microsoft.ACS.Linux.RHEL.6.Deleting.Group (Rule)

Rule to collect events for deleting a group

Knowledge Base article:

Summary

A successful groupdel command has been detected in the system log files.

Causes

A group was deleted from the system. This monitor allows system administrators to track account/group creation and deletion.

Resolutions

The description of the alert and/or the output data item contains information on the event encountered. If the activity appears suspicious, please check the associated event details and any other events that happened around the time of this event.

Element properties:

TargetMicrosoft.ACS.Linux.RHEL.6.ACSEndPoint
CategoryEventCollection
EnabledTrue
Alert GenerateFalse
RemotableTrue

Member Modules:

ID Module Type TypeId RunAs 
EventDS DataSource Microsoft.Unix.SCXLog.Privileged.Datasource Default
WA WriteAction Microsoft.ACS.Unix.SecureEventLogWriter Default

Source Code:

<Rule ID="Microsoft.ACS.Linux.RHEL.6.Deleting.Group" Enabled="true" Target="Microsoft.ACS.Linux.RHEL.6.ACSEndPoint" Remotable="true">

  <Category>EventCollection</Category>

  <DataSources>

    <DataSource ID="EventDS" TypeID="Unix!Microsoft.Unix.SCXLog.Privileged.Datasource">

      <Host>$Target/Host/Property[Type="Unix!Microsoft.Unix.Computer"]/NetworkName$</Host>

      <LogFile>/var/log/secure</LogFile>

      <!-- [TYPE] Redhat6 GroupDelete True -->

      <!-- [INPUT] Oct  5 08:05:29 scxcrd-rhel6-01 groupdel[20970]: group 'tempgroup' removed -->

      <!-- [EXPECTED] date="Oct  5 08:05:29"; hostname="scxcrd-rhel6-01"; process="groupdel"; processId="20970"; groupName="tempgroup" -->

      <RegExpFilter>\s+groupdel\[[[:digit:]]+\]: group '\S+' removed</RegExpFilter>

    </DataSource>

  </DataSources>

  <WriteActions>

    <WriteAction ID="WA" TypeID="ACS.Unix!Microsoft.ACS.Unix.SecureEventLogWriter">

      <RegExp>(?'date'\S+\s+\d+\s+\d+:\d+:\d+)\s+(?:\S+:)?(?'hostname'\S+)\s+(?'process'groupdel)\[(?'processId'\d+)\]: group '(?'groupName'\S+)' removed</RegExp>

      <EventType>1</EventType>

      <EventId>27005</EventId>

      <BackrefOverrides>sessionName="Group removed"</BackrefOverrides>

    </WriteAction>

  </WriteActions>

</Rule>