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<h2 class="title"><a id="netcat-network-activity"></a>Netcat Network Activity<a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/stack-docs/edit/7.8/docs/en/siem/detections/prebuilt-rules/rule-details/netcat-network-activity.asciidoc">edit</a></h2>
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<p>A <code class="literal">netcat</code> process is engaging in network activity on a Linux host. Netcat is
often used as a persistence mechanism by exporting a reverse shell or by serving
a shell on a listening port. Netcat is also sometimes used for data
exfiltration.</p>
<p><span class="strong strong"><strong>Rule type</strong></span>: query</p>
<p><span class="strong strong"><strong>Rule indices</strong></span>:</p>
<div class="ulist itemizedlist">
<ul class="itemizedlist">
<li class="listitem">
auditbeat-*
</li>
</ul>
</div>
<p><span class="strong strong"><strong>Severity</strong></span>: medium</p>
<p><span class="strong strong"><strong>Risk score</strong></span>: 47</p>
<p><span class="strong strong"><strong>Runs every</strong></span>: 5 minutes</p>
<p><span class="strong strong"><strong>Searches indices from</strong></span>: now-6m (<a href="/guide/en/elasticsearch/reference/7.8/common-options.html#date-math" class="ulink" target="_top">Date Math format</a>, see also <a class="xref" href="rules-ui-create.html#rule-schedule"><code class="literal">Additional look-back time</code></a>)</p>
<p><span class="strong strong"><strong>Maximum signals per execution</strong></span>: 100</p>
<p><span class="strong strong"><strong>References</strong></span>:</p>
<div class="ulist itemizedlist">
<ul class="itemizedlist">
<li class="listitem">
<a href="http://pentestmonkey.net/cheat-sheet/shells/reverse-shell-cheat-sheet" class="ulink" target="_top">http://pentestmonkey.net/cheat-sheet/shells/reverse-shell-cheat-sheet</a>
</li>
<li class="listitem">
<a href="https://www.sans.org/security-resources/sec560/netcat_cheat_sheet_v1.pdf" class="ulink" target="_top">https://www.sans.org/security-resources/sec560/netcat_cheat_sheet_v1.pdf</a>
</li>
<li class="listitem">
<a href="https://en.wikipedia.org/wiki/Netcat" class="ulink" target="_top">https://en.wikipedia.org/wiki/Netcat</a>
</li>
</ul>
</div>
<p><span class="strong strong"><strong>Tags</strong></span>:</p>
<div class="ulist itemizedlist">
<ul class="itemizedlist">
<li class="listitem">
Elastic
</li>
<li class="listitem">
Linux
</li>
</ul>
</div>
<p><span class="strong strong"><strong>Version</strong></span>: 2 (<a class="xref" href="netcat-network-activity.html#netcat-network-activity-history" title="Rule version history">version history</a>)</p>
<p><span class="strong strong"><strong>Added (Elastic Stack release)</strong></span>: 7.6.0</p>
<p><span class="strong strong"><strong>Last modified (Elastic Stack release)</strong></span>: 7.7.0</p>
<div class="section">
<div class="titlepage"><div><div>
<h3 class="title"><a id="_potential_false_positives_27"></a>Potential false positives<a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/stack-docs/edit/7.8/docs/en/siem/detections/prebuilt-rules/rule-details/netcat-network-activity.asciidoc">edit</a></h3>
</div></div></div>
<p>Netcat is a dual-use tool that can be used for benign or malicious activity.
Netcat is included in some Linux distributions so its presence is not
necessarily suspicious. Some normal use of this program, while uncommon, may
originate from scripts, automation tools, and frameworks.</p>
</div>
<div class="section">
<div class="titlepage"><div><div>
<h3 class="title"><a id="_rule_query_51"></a>Rule query<a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/stack-docs/edit/7.8/docs/en/siem/detections/prebuilt-rules/rule-details/netcat-network-activity.asciidoc">edit</a></h3>
</div></div></div>
<div class="pre_wrapper lang-js">
<pre class="programlisting prettyprint lang-js">process.name:(nc or ncat or netcat or netcat.openbsd or
netcat.traditional) and event.action:(bound-socket or connected-to or
socket_opened)</pre>
</div>
</div>
<div class="section">
<div class="titlepage"><div><div>
<h3 class="title"><a id="netcat-network-activity-history"></a>Rule version history<a class="edit_me" rel="nofollow" title="Edit this page on GitHub" href="https://github.com/elastic/stack-docs/edit/7.8/docs/en/siem/detections/prebuilt-rules/rule-details/netcat-network-activity.asciidoc">edit</a></h3>
</div></div></div>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
Version 2 (7.7.0 release)
</span>
</dt>
<dd>
<p>
Updated query, changed from:
</p>
<div class="pre_wrapper lang-js">
<pre class="programlisting prettyprint lang-js">process.name: (nc or ncat or netcat or netcat.openbsd or
netcat.traditional) and event.action: (connected-to or bound-socket or
socket_opened)</pre>
</div>
</dd>
</dl>
</div>
</div>
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