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<div class="titlepage"><div><div>
<h2 class="title"><a id="network-connection-via-compiled-html-file"></a>Network Connection via Compiled HTML File<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/network-connection-via-compiled-html-file.asciidoc">edit</a></h2>
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<p>Compiled HTML files (<code class="literal">.chm</code>) are commonly distributed as part of the Microsoft
HTML Help system. Adversaries may conceal malicious code in a CHM file and
deliver it to a victim for execution. CHM content is loaded by the HTML Help
executable program (<code class="literal">hh.exe</code>).</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">
winlogbeat-*
</li>
</ul>
</div>
<p><span class="strong strong"><strong>Severity</strong></span>: low</p>
<p><span class="strong strong"><strong>Risk score</strong></span>: 21</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>Tags</strong></span>:</p>
<div class="ulist itemizedlist">
<ul class="itemizedlist">
<li class="listitem">
Elastic
</li>
<li class="listitem">
Windows
</li>
</ul>
</div>
<p><span class="strong strong"><strong>Version</strong></span>: 2 (<a class="xref" href="network-connection-via-compiled-html-file.html#network-connection-via-compiled-html-file-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="_rule_query_53"></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/network-connection-via-compiled-html-file.asciidoc">edit</a></h3>
</div></div></div>
<div class="pre_wrapper lang-js">
<pre class="programlisting prettyprint lang-js">process.name:hh.exe and event.action:"Network connection detected
(rule: NetworkConnect)" and not destination.ip:(10.0.0.0/8 or
172.16.0.0/12 or 192.168.0.0/16)</pre>
</div>
</div>
<div class="section">
<div class="titlepage"><div><div>
<h3 class="title"><a id="_threat_mapping_41"></a>Threat mapping<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/network-connection-via-compiled-html-file.asciidoc">edit</a></h3>
</div></div></div>
<p><span class="strong strong"><strong>Framework</strong></span>: MITRE ATT&CK<sup>TM</sup></p>
<div class="ulist itemizedlist">
<ul class="itemizedlist">
<li class="listitem">
<p>Tactic:</p>
<div class="ulist itemizedlist">
<ul class="itemizedlist">
<li class="listitem">
Name: Execution
</li>
<li class="listitem">
ID: TA0002
</li>
<li class="listitem">
Reference URL: <a href="https://attack.mitre.org/tactics/TA0002/" class="ulink" target="_top">https://attack.mitre.org/tactics/TA0002/</a>
</li>
</ul>
</div>
</li>
<li class="listitem">
<p>Technique:</p>
<div class="ulist itemizedlist">
<ul class="itemizedlist">
<li class="listitem">
Name: Compiled HTML File
</li>
<li class="listitem">
ID: T1223
</li>
<li class="listitem">
Reference URL: <a href="https://attack.mitre.org/techniques/T1223/" class="ulink" target="_top">https://attack.mitre.org/techniques/T1223/</a>
</li>
</ul>
</div>
</li>
<li class="listitem">
<p>Tactic:</p>
<div class="ulist itemizedlist">
<ul class="itemizedlist">
<li class="listitem">
Name: Defense Evasion
</li>
<li class="listitem">
ID: TA0005
</li>
<li class="listitem">
Reference URL: <a href="https://attack.mitre.org/tactics/TA0005/" class="ulink" target="_top">https://attack.mitre.org/tactics/TA0005/</a>
</li>
</ul>
</div>
</li>
<li class="listitem">
<p>Technique:</p>
<div class="ulist itemizedlist">
<ul class="itemizedlist">
<li class="listitem">
Name: Compiled HTML File
</li>
<li class="listitem">
ID: T1223
</li>
<li class="listitem">
Reference URL: <a href="https://attack.mitre.org/techniques/T1223/" class="ulink" target="_top">https://attack.mitre.org/techniques/T1223/</a>
</li>
</ul>
</div>
</li>
</ul>
</div>
</div>
<div class="section">
<div class="titlepage"><div><div>
<h3 class="title"><a id="network-connection-via-compiled-html-file-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/network-connection-via-compiled-html-file.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:hh.exe and event.action:"Network connection detected
(rule: NetworkConnect)" and not destination.ip:10.0.0.0/8 and not
destination.ip:172.16.0.0/12 and not destination.ip:192.168.0.0/16</pre>
</div>
</dd>
</dl>
</div>
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