# T1485 - Data Destruction
## [Description from ATT&CK](https://attack.mitre.org/techniques/T1485)
<blockquote>Adversaries may destroy data and files on specific systems or in large numbers on a network to interrupt availability to systems, services, and network resources. Data destruction is likely to render stored data irrecoverable by forensic techniques through overwriting files or data on local and remote drives.(Citation: Symantec Shamoon 2012)(Citation: FireEye Shamoon Nov 2016)(Citation: Palo Alto Shamoon Nov 2016)(Citation: Kaspersky StoneDrill 2017)(Citation: Unit 42 Shamoon3 2018)(Citation: Talos Olympic Destroyer 2018) Common operating system file deletion commands such as <code>del</code> and <code>rm</code> often only remove pointers to files without wiping the contents of the files themselves, making the files recoverable by proper forensic methodology. This behavior is distinct from [Disk Content Wipe](https://attack.mitre.org/techniques/T1561/001) and [Disk Structure Wipe](https://attack.mitre.org/techniques/T1561/002) because individual files are destroyed rather than sections of a storage disk or the disk's logical structure.

Adversaries may attempt to overwrite files and directories with randomly generated data to make it irrecoverable.(Citation: Kaspersky StoneDrill 2017)(Citation: Unit 42 Shamoon3 2018) In some cases politically oriented image files have been used to overwrite data.(Citation: FireEye Shamoon Nov 2016)(Citation: Palo Alto Shamoon Nov 2016)(Citation: Kaspersky StoneDrill 2017)

To maximize impact on the target organization in operations where network-wide availability interruption is the goal, malware designed for destroying data may have worm-like features to propagate across a network by leveraging additional techniques like [Valid Accounts](https://attack.mitre.org/techniques/T1078), [OS Credential Dumping](https://attack.mitre.org/techniques/T1003), and [SMB/Windows Admin Shares](https://attack.mitre.org/techniques/T1021/002).(Citation: Symantec Shamoon 2012)(Citation: FireEye Shamoon Nov 2016)(Citation: Palo Alto Shamoon Nov 2016)(Citation: Kaspersky StoneDrill 2017)(Citation: Talos Olympic Destroyer 2018).

In cloud environments, adversaries may leverage access to delete cloud storage, cloud storage accounts, machine images, and other infrastructure crucial to operations to damage an organization or their customers.(Citation: Data Destruction - Threat Post)(Citation: DOJ  - Cisco Insider)</blockquote>

## Atomic Tests

- [Atomic Test #1 - Windows - Overwrite file with Sysinternals SDelete](#atomic-test-1---windows---overwrite-file-with-sysinternals-sdelete)

- [Atomic Test #2 - macOS/Linux - Overwrite file with DD](#atomic-test-2---macoslinux---overwrite-file-with-dd)

- [Atomic Test #3 - Overwrite deleted data on C drive](#atomic-test-3---overwrite-deleted-data-on-c-drive)


<br/>

## Atomic Test #1 - Windows - Overwrite file with Sysinternals SDelete
Overwrites and deletes a file using Sysinternals SDelete. Upon successful execution, "Files deleted: 1" will be displayed in
the powershell session along with other information about the file that was deleted.

**Supported Platforms:** Windows


**auto_generated_guid:** 476419b5-aebf-4366-a131-ae3e8dae5fc2





#### Inputs:
| Name | Description | Type | Default Value |
|------|-------------|------|---------------|
| sdelete_exe | Path of sdelete executable | Path | $env:TEMP&#92;Sdelete&#92;sdelete.exe|
| file_to_delete | Path of file to delete | Path | $env:TEMP&#92;T1485.txt|


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


```powershell
if (-not (Test-Path #{file_to_delete})) { New-Item #{file_to_delete} -Force }
Invoke-Expression -Command "#{sdelete_exe} -accepteula #{file_to_delete}"
```




#### Dependencies:  Run with `powershell`!
##### Description: Secure delete tool from Sysinternals must exist on disk at specified location (#{sdelete_exe})
##### Check Prereq Commands:
```powershell
if (Test-Path #{sdelete_exe}) {exit 0} else {exit 1}
```
##### Get Prereq Commands:
```powershell
Invoke-WebRequest "https://download.sysinternals.com/files/SDelete.zip" -OutFile "$env:TEMP\SDelete.zip"
Expand-Archive $env:TEMP\SDelete.zip $env:TEMP\Sdelete -Force
Remove-Item $env:TEMP\SDelete.zip -Force
```




<br/>
<br/>

## Atomic Test #2 - macOS/Linux - Overwrite file with DD
Overwrites and deletes a file using DD.
To stop the test, break the command with CTRL/CMD+C.

**Supported Platforms:** Linux, macOS


**auto_generated_guid:** 38deee99-fd65-4031-bec8-bfa4f9f26146





#### Inputs:
| Name | Description | Type | Default Value |
|------|-------------|------|---------------|
| overwrite_source | Path of data source to overwrite with | Path | /dev/zero|
| file_to_overwrite | Path of file to overwrite and remove | Path | /var/log/syslog|


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


```bash
dd of=#{file_to_overwrite} if=#{overwrite_source} count=$(ls -l #{file_to_overwrite} | awk '{print $5}') iflag=count_bytes
```






<br/>
<br/>

## Atomic Test #3 - Overwrite deleted data on C drive
RansomEXX malware removes all deleted files using windows built-in cipher.exe to prevent forensic recover.
This process is very slow and test execution may timeout. 
https://www.cybereason.com/blog/cybereason-vs.-ransomexx-ransomware
https://support.microsoft.com/en-us/topic/cipher-exe-security-tool-for-the-encrypting-file-system-56c85edd-85cf-ac07-f2f7-ca2d35dab7e4

**Supported Platforms:** Windows


**auto_generated_guid:** 321fd25e-0007-417f-adec-33232252be19






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


```cmd
cipher.exe /w:C:
```






<br/>
