# T1547.009 - Shortcut Modification
## [Description from ATT&CK](https://attack.mitre.org/techniques/T1547/009)
<blockquote>Adversaries may create or edit shortcuts to run a program during system boot or user login. Shortcuts or symbolic links are ways of referencing other files or programs that will be opened or executed when the shortcut is clicked or executed by a system startup process.

Adversaries could use shortcuts to execute their tools for persistence. They may create a new shortcut as a means of indirection that may use [Masquerading](https://attack.mitre.org/techniques/T1036) to look like a legitimate program. Adversaries could also edit the target path or entirely replace an existing shortcut so their tools will be executed instead of the intended legitimate program.</blockquote>

## Atomic Tests

- [Atomic Test #1 - Shortcut Modification](#atomic-test-1---shortcut-modification)

- [Atomic Test #2 - Create shortcut to cmd in startup folders](#atomic-test-2---create-shortcut-to-cmd-in-startup-folders)


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## Atomic Test #1 - Shortcut Modification
This test to simulate shortcut modification and then execute. example shortcut (*.lnk , .url) strings check with powershell;
gci -path "C:\Users" -recurse -include *.url -ea SilentlyContinue | Select-String -Pattern "exe" | FL.
Upon execution, calc.exe will be launched.

**Supported Platforms:** Windows


**auto_generated_guid:** ce4fc678-364f-4282-af16-2fb4c78005ce





#### Inputs:
| Name | Description | Type | Default Value |
|------|-------------|------|---------------|
| shortcut_file_path | shortcut modified and execute | Path | %temp%&#92;T1547.009_modified_shortcut.url|


#### Attack Commands: Run with `command_prompt`! 


```cmd
echo [InternetShortcut] > #{shortcut_file_path}
echo URL=C:\windows\system32\calc.exe >> #{shortcut_file_path}
#{shortcut_file_path}
```

#### Cleanup Commands:
```cmd
del -f #{shortcut_file_path} >nul 2>&1
```





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## Atomic Test #2 - Create shortcut to cmd in startup folders
LNK file to launch CMD placed in startup folder. Upon execution, open File Explorer and browse to "%APPDATA%\Microsoft\Windows\Start Menu\Programs\Startup\"
to view the new shortcut.

**Supported Platforms:** Windows


**auto_generated_guid:** cfdc954d-4bb0-4027-875b-a1893ce406f2






#### Attack Commands: Run with `powershell`!  Elevation Required (e.g. root or admin) 


```powershell
$Shell = New-Object -ComObject ("WScript.Shell")
$ShortCut = $Shell.CreateShortcut("$env:APPDATA\Microsoft\Windows\Start Menu\Programs\Startup\T1547.009.lnk")
$ShortCut.TargetPath="cmd.exe"
$ShortCut.WorkingDirectory = "C:\Windows\System32";
$ShortCut.WindowStyle = 1;
$ShortCut.Description = "T1547.009.";
$ShortCut.Save()

$Shell = New-Object -ComObject ("WScript.Shell")
$ShortCut = $Shell.CreateShortcut("$env:ProgramData\Microsoft\Windows\Start Menu\Programs\Startup\T1547.009.lnk")
$ShortCut.TargetPath="cmd.exe"
$ShortCut.WorkingDirectory = "C:\Windows\System32";
$ShortCut.WindowStyle = 1;
$ShortCut.Description = "T1547.009.";
$ShortCut.Save()
```

#### Cleanup Commands:
```powershell
Remove-Item "$env:APPDATA\Microsoft\Windows\Start Menu\Programs\Startup\T1547.009.lnk" -ErrorAction Ignore
Remove-Item "$env:ProgramData\Microsoft\Windows\Start Menu\Programs\Startup\T1547.009.lnk" -ErrorAction Ignore
```





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