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Muktar Yahuza

25 September 2026

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<article class="advisory">

<!-- ================= HEADER ================= -->
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<!-- Replace the src with your official NCC-CSIRT logo file -->
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src="/ncc-csirt-logo.png"
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onerror="this.style.visibility='hidden'">
<h1 class="advisory__title">NCC-CSIRT Security Advisory</h1>
</header>

<!-- ================= DETAILS TABLE ================= -->
<table class="advisory__table">
<tbody>

<!-- TITLE -->
<tr>
<th scope="row">Title</th>
<td class="cell-title">
Security Advisory on Remote Execution of Malicious Code Targeting Windows Endpoints
</td>
</tr>

<!-- ADVISORY ID -->
<tr>
<th scope="row">Advisory ID</th>
<td>NCC-CSIRT-030626-024</td>
</tr>

<!-- PROBABILITY → sev--low | sev--medium | sev--high | sev--critical -->
<tr>
<th scope="row">Probability</th>
<td><span class="sev sev--high">High</span></td>
</tr>

<!-- IMPACT → sev--low | sev--medium | sev--high | sev--critical -->
<tr>
<th scope="row">Impact</th>
<td><span class="sev sev--high">High</span></td>
</tr>

<!-- PUBLICATION DATE -->
<tr>
<th scope="row">Publication date</th>
<td>03-06-2026</td>
</tr>

<!-- PRODUCT(S) -->
<tr>
<th scope="row">Product (s)</th>
<td>Microsoft Windows Operating System</td>
</tr>

<!-- VERSION(S) -->
<tr>
<th scope="row">Version (s)</th>
<td>
All versions supporting WebClient/WebDAV and rundll32 execution
(various Windows builds).
</td>
</tr>

<!-- PLATFORM(S) -->
<tr>
<th scope="row">Platform (s)</th>
<td>
Windows endpoints in enterprise and communications infrastructure
environments.
</td>
</tr>

<!-- SUMMARY -->
<tr>
<th scope="row">Summary</th>
<td>
<p>
A Remote Code Execution (RCE) incident involving the execution of
malicious code on a Windows endpoint has been observed within the
Communications Sector. The activity involved the abuse of legitimate
Windows components to retrieve and execute a malicious payload from a
remote server, allowing unauthorized code execution on the affected
system.
</p>
<p>
This technique can enable threat actors to compromise endpoints,
evade traditional security controls, and potentially establish
further access within a network. Organizations are advised to review
their security controls and implement the recommended mitigation
measures to reduce the risk of similar attacks.
</p>
</td>
</tr>

<!-- THREAT TYPE(S) -->
<tr>
<th scope="row">Threat Type (s)</th>
<td>
<ul>
<li>Remote Code Execution (RCE)</li>
<li>Living-off-the-Land (LOLBIN) Abuse</li>
<li>WebDAV-based Payload Delivery</li>
<li>Command Execution via Native Windows Tools</li>
<li>Endpoint Evasion Techniques</li>
</ul>
</td>
</tr>

<!-- CONSEQUENCES -->
<tr>
<th scope="row">Consequences</th>
<td>
<p>Successful exploitation may result in:</p>
<ul>
<li>Full remote execution of attacker-controlled code on endpoints</li>
<li>Execution of malicious DLL payloads without writing files to disk</li>
<li>Potential credential theft or system manipulation</li>
<li>Possible lateral movement across enterprise networks</li>
<li>Reduced detection due to legitimate Windows process abuse</li>
<li>Compromise of user endpoints in communications environments</li>
</ul>
</td>
</tr>

<!-- DESCRIPTION -->
<tr>
<th scope="row">Description</th>
<td>
<p>
A Remote Code Execution (RCE) incident was observed in which a threat
actor leveraged Windows native functionality to remotely retrieve and
execute a malicious DLL payload. The attack utilized a
Living-off-the-Land (LotL) technique involving the execution of
<code>rundll32.exe</code> through <code>cmd.exe</code>, combined with
the abuse of the Windows WebClient service and WebDAV protocol.
</p>
<p>
The malicious payload was hosted on attacker-controlled
infrastructure and delivered over HTTPS through a WebDAV-accessible
UNC path. Upon execution, the Windows WebClient service translated
the remote resource request into WebDAV traffic, enabling the payload
to be dynamically loaded and executed without a traditional file
download to disk.
</p>
<p>
Observed indicators included suspicious
<code>cmd.exe &rarr; rundll32.exe</code> process chains,
WebDAV-related HTTPS traffic, and use of the HTTP
<code>PROPFIND</code> method, remote DLL execution, and communication
with a newly registered domain used for payload delivery. This
technique can significantly reduce forensic visibility and increase
the likelihood of evading conventional file-based security controls.
</p>
<p>
If successful, the attack may result in unauthorized code execution,
endpoint compromise, persistence, credential theft, lateral movement,
and further malicious activity within the affected environment.
</p>
</td>
</tr>

<!-- SOLUTION -->
<tr>
<th scope="row">Solution</th>
<td>
<p>NCC-CSIRT strongly recommends the following immediate actions:</p>
<ul>
<li>Disable unnecessary WebDAV services and functionality.</li>
<li>Monitor for suspicious <code>cmd.exe</code> and <code>rundll32.exe</code> execution.</li>
<li>Restrict outbound WebDAV and remote file-share access where possible.</li>
<li>Block known malicious domains and indicators of compromise.</li>
<li>Enable enhanced endpoint monitoring and command-line logging.</li>
<li>Conduct threat hunting for similar activity across the environment.</li>
<li>Review EDR rules to detect abuse of legitimate Windows utilities.</li>
<li>Investigate affected systems and remediate identified threats.</li>
</ul>
</td>
</tr>

<!-- REFERENCES -->
<tr>
<th scope="row">References</th>
<td>
<ul class="ref-list">
<li><a href="https://attack.mitre.org/techniques/T1218/011/" target="_blank" rel="noopener">https://attack.mitre.org/techniques/T1218/011/</a></li>
<li><a href="https://attack.mitre.org/techniques/T1021/" target="_blank" rel="noopener">https://attack.mitre.org/techniques/T1021/</a></li>
<li><a href="https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/rundll32" target="_blank" rel="noopener">https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/rundll32</a></li>
<li><a href="https://www.cisa.gov" target="_blank" rel="noopener">https://www.cisa.gov</a></li>
</ul>
</td>
</tr>

</tbody>
</table>

</article>

</body>
</html>{/source}

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