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T1110.002

T1110.002 - Brute Force: Password Cracking

Description from ATT&CK (opens in a new tab)

Adversaries may use password cracking to attempt to recover usable credentials, such as plaintext passwords, when credential material such as password hashes are obtained. OS Credential Dumping (opens in a new tab) can be used to obtain password hashes, this may only get an adversary so far when Pass the Hash (opens in a new tab) is not an option. Further, adversaries may leverage Data from Configuration Repository (opens in a new tab) in order to obtain hashed credentials for network devices.(Citation: US-CERT-TA18-106A)

Techniques to systematically guess the passwords used to compute hashes are available, or the adversary may use a pre-computed rainbow table to crack hashes. Cracking hashes is usually done on adversary-controlled systems outside of the target network.(Citation: Wikipedia Password cracking) The resulting plaintext password resulting from a successfully cracked hash may be used to log into systems, resources, and services in which the account has access.

Atomic Tests


Atomic Test #1 - Password Cracking with Hashcat

Execute Hashcat.exe with provided SAM file from registry of Windows and Password list to crack against

Supported Platforms: Windows

auto_generated_guid: 6d27df5d-69d4-4c91-bc33-5983ffe91692

Inputs:

NameDescriptionTypeDefault Value
hashcat_exePath to Hashcat executablestringPathToAtomicsFolder\..\ExternalPayloads\hashcat6\hashcat-6.1.1\hashcat.exe
input_file_samPath to SAM filestringPathToAtomicsFolder\T1110.002\src\sam.txt
input_file_passwordsPath to password liststringPathToAtomicsFolder\T1110.002\src\password.lst

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

cd #{hashcat_exe}\..
#{hashcat_exe} -a 0 -m 1000 -r .\rules\Incisive-leetspeak.rule #{input_file_sam} #{input_file_passwords}

Cleanup Commands:

del "PathToAtomicsFolder\..\ExternalPayloads\hashcat6.7z" >nul 2>&1
del "PathToAtomicsFolder\..\ExternalPayloads\7z1900.exe" >nul 2>&1
del "PathToAtomicsFolder\..\ExternalPayloads\7z" /Q /S >nul 2>&1
del "PathToAtomicsFolder\..\ExternalPayloads\hashcat-unzip" /Q /S >nul 2>&1

Dependencies: Run with powershell!

Description: Hashcat must exist on disk at specified location (#{hashcat_exe})
Check Prereq Commands:
if (Test-Path  $(cmd /c echo "#{hashcat_exe}")) {exit 0} else {exit 1}
Get Prereq Commands:
New-Item -Type Directory "PathToAtomicsFolder\..\ExternalPayloads\" -ErrorAction Ignore -Force | Out-Null
Invoke-WebRequest "https://www.7-zip.org/a/7z1900.exe" -OutFile "PathToAtomicsFolder\..\ExternalPayloads\7z1900.exe"
Start-Process -FilePath "PathToAtomicsFolder\..\ExternalPayloads\7z1900.exe" -ArgumentList "/S /D=PathToAtomicsFolder\..\ExternalPayloads\7zi" -NoNewWindow
Invoke-WebRequest "https://hashcat.net/files/hashcat-6.1.1.7z" -OutFile "PathToAtomicsFolder\..\ExternalPayloads\hashcat6.7z"
Start-Process cmd.exe -Args  "/c %temp%\7z\7z.exe x %temp%\hashcat6.7z -aoa -o%temp%\hashcat-unzip" -Wait
New-Item -ItemType Directory (Split-Path $(cmd /c echo #{hashcat_exe})) -Force | Out-Null
Move-Item "PathToAtomicsFolder\..\ExternalPayloads\hashcat-unzip\hashcat-6.1.1\*" $(cmd /c echo #{hashcat_exe}\..) -Force -ErrorAction Ignore

T1110.001T1110.003