t1491-defacement

name	T1491_defacement
description	Adversaries may modify visual content available internally or externally to an enterprise network, thus affecting the integrity of the original content.
category	business-logic
version	18.1
author	cyberstrike-official
tags	["mitre-attack","enterprise","t1491","impact","windows","iaas","linux","macos","esxi"]
technique_id	T1491
tactic	impact
all_tactics	["impact"]
platforms	["Windows","IaaS","Linux","macOS","ESXi"]
mitre_url	https://attack.mitre.org/techniques/T1491
tech_stack	["windows","cloud","linux","macos","esxi"]
cwe_ids	["CWE-400"]
chains_with	["T1491.001","T1491.002"]
prerequisites	[]
severity_boost	{"T1491.001":"Chain with T1491.001 for deeper attack path","T1491.002":"Chain with T1491.002 for deeper attack path"}

T1491 Defacement

High-Level Description

Adversaries may modify visual content available internally or externally to an enterprise network, thus affecting the integrity of the original content. Reasons for Defacement include delivering messaging, intimidation, or claiming (possibly false) credit for an intrusion. Disturbing or offensive images may be used as a part of Defacement in order to cause user discomfort, or to pressure compliance with accompanying messages.

Kill Chain Phase

• Impact (TA0040)

Platforms: Windows, IaaS, Linux, macOS, ESXi

What to Check

• Identify if Defacement technique is applicable to target environment
• Check Windows systems for indicators of Defacement
• Check IaaS systems for indicators of Defacement
• Check Linux systems for indicators of Defacement
• Verify mitigations are bypassed or absent (1 known mitigations)
• Assess detection coverage (1 detection strategies)

How to Test

Manual Testing

1. Identify Attack Surface: Determine if the target environment is susceptible to Defacement by examining the target platforms (Windows, IaaS, Linux).

2. Assess Existing Defenses: Review whether mitigations for T1491 are in place. If defenses are absent or misconfigured, this technique may be exploitable.

3. Execute Test: Use tools and methods described in the MITRE ATT&CK page and external references below.

Note: No Atomic Red Team tests available for this technique. See Atomic Red Team GitHub for updates.

Remediation Guide

M1053 Data Backup

Consider implementing IT disaster recovery plans that contain procedures for taking regular data backups that can be used to restore organizational data. Ensure backups are stored off system and is protected from common methods adversaries may use to gain access and destroy the backups to prevent recovery.

Detection

Defacement via File and Web Content Modification Across Platforms

Risk Assessment