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从组中删除用户(Red Hat Enterprise Linux Server 6)

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

用于收集从组中删除用户的事件的规则

Knowledge Base article:

摘要

在系统日志文件中检测到成功的 usermod 命令。

原因

已从系统上的组中删除用户。此监视器允许系统管理员跟踪帐户/组的创建和删除。

解决方法

警报和/或输出数据项的描述包含有关遇到的事件的信息。如果活动显得可疑，请检查关联的事件详细信息以及此事件时间附近发生的任何其他事件。

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.User.From.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 UserDeleteFromGroup True -->

      <!-- [INPUT] Oct  5 08:01:44 scxcrd-rhel6-01 usermod[20903]: delete 'tempuser' from group 'users' -->

      <!-- [EXPECTED] date="Oct  5 08:01:44"; hostname="scxcrd-rhel6-01"; process="usermod"; processId="20903"; clientUser="tempuser"; groupName="users" -->

      <RegExpFilter>\s+usermod\[[[:digit:]]+\]: delete '\S+' from group '\S+'</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'usermod)\[(?'processId'\d+)\]: delete '(?'clientUser'\S+)' from group '(?'groupName'\S+)'</RegExp>

      <EventType>1</EventType>

      <EventId>27005</EventId>

      <BackrefOverrides>sessionName="User removed from group"</BackrefOverrides>

    </WriteAction>

  </WriteActions>

</Rule>