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<!DOCTYPE html>
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<title>OTC Talks #10</title>
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<h1>OTC Talks #10</h1>
<section id="talks-details">
<h2>Table of Contents</h2>
<ul id="talks-list">
<li>
<a href="#talk-1"
>EC2 Instance Connect as a Backdoor: Silent Persistence
in AWS</a
>
</li>
</ul>
<h2 id="details">Details</h2>
<ul>
<li><b>Date</b>: 24th January 2026</li>
<li><b>Timing</b>: 10:30 PM IST / 11 AM CST</li>
<li>
<b>Where</b>: Online, before
<a
href="https://catchup.ourtech.community/attend"
target="_blank"
rel="noreferrer"
>OTC CatchUp #272</a
>
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<main id="main-content">
<section id="talk-1" class="talk-section">
<h2 class="talk-title">
EC2 Instance Connect as a Backdoor: Silent Persistence in
AWS
</h2>
<p>
Speaker:
<a
href="https://www.linkedin.com/in/nathaniel-fernandes"
target="_blank"
rel="noreferrer"
>Nathaniel Fernandes</a
>
</p>
<h3 id="abstract-1">Abstract</h3>
<p>
This talk explores a stealthy persistence technique abusing
EC2 Instance Connect, discovered while analyzing how SSH key
injection works in AWS EC2. By modifying the
AuthorizedKeysCommand script used by the SSH daemon,
persistent SSH access can be established without adding keys
to authorized_keys and without generating CloudTrail logs.
This creates a blind spot for traditional SOC monitoring and
cloud security controls. The session breaks down the root
cause of this trust failure, demonstrates the persistence
mechanism, and discusses practical detection and hardening
strategies for defenders.
</p>
<h3 id="relevant-links-1">Relevant Links</h3>
<ul>
<li>
<a
href="https://www.youtube.com/watch?v=yXPSRRWi4b4"
target="_blank"
rel="noreferrer"
>Talk recording</a
>
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<li>
<a
href="https://www.canva.com/design/DAG-mHDgttg/h7Nq4aOMjYOu0FFWgr_O-A/edit?utm_content=DAG-mHDgttg&utm_campaign=designshare&utm_medium=link2&utm_source=sharebutton"
target="_blank"
rel="noreferrer"
>Slide deck</a
>
</li>
<li>
<a
href="https://docs.wehost.co.in/blog/from-curiosity-to-backdoor-how-i-found-a-stealthy-persistence-technique-in-ec2-instance-connect"
target="_blank"
rel="noreferrer"
>From Curiosity to Backdoor: How I Found a Stealthy
Persistence Technique in EC2 Instance Connect</a
>
</li>
</ul>
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