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Failed su (AIX 5.3)

Microsoft.ACS.AIX.5.3.Su.Failed (Rule)

Rule to collect events for failed call to su

Knowledge Base article:

Summary

An unsuccessful 'su' command has been detected in the system log files.

Causes

User attempted to be granted access to privileged accounts. This monitor allows system administrators to track 'su' usage.

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.AIX.5.3.ACSEndPoint
CategoryEventCollection
EnabledFalse
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.AIX.5.3.Su.Failed" Enabled="false" Target="Microsoft.ACS.AIX.5.3.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/syslog.log</LogFile>

      <!-- [TYPE] AIX SU False -->

      <!-- [INPUT] Oct 30 14:54:46 scxaix3-1 auth|security:crit su: BAD SU from scxuser to ccrammo at /dev/pts/1 -->

      <!-- [EXPECTED] date="Oct 30 14:54:46"; hostname="scxaix3-1"; process="su"; clientUser="ccrammo"; user="scxuser" -->

      <!-- [INPUT] Nov 12 14:28:51 scxaix3-1 auth|security:crit su: BAD SU from scxuser to ccrammo at vty1 -->

      <!-- [EXPECTED] date="Nov 12 14:28:51"; hostname="scxaix3-1"; process="su"; clientUser="ccrammo"; user="scxuser" -->

      <RegExpFilter>[[:space:]]+su:[[:space:]]*BAD SU from [^[:space:]]+ to [^[:space:]]+</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'su)\s*:\s*BAD SU from (?'user'\S+)\s+to\s+(?'clientUser'\S+)</RegExp>

      <EventType>0</EventType>

      <EventId>27003</EventId>

    </WriteAction>

  </WriteActions>

</Rule>