# T1628.003_conceal-multimedia-files

> Adversaries may attempt to hide multimedia files from the user.

- Skill: `cyberstrikeus/t1628-003-conceal-multimedia-files` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/t1628-003-conceal-multimedia-files`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/t1628-003-conceal-multimedia-files/raw
- Safety review: PASS (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: cyberstrikeus (https://skillmd.com/u/cyberstrikeus)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/cyberstrikeus/t1628-003-conceal-multimedia-files

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# T1628.003 Conceal Multimedia Files

> **Sub-technique of:** T1628

## High-Level Description

Adversaries may attempt to hide multimedia files from the user. By doing so, adversaries may conceal captured files, such as pictures, videos and/or screenshots, then later exfiltrate those files.

Specific to Android devices, if the `.nomedia` file is present in a folder, multimedia files in that folder will not be visible to the user in the Gallery application. Additionally, other applications are asked not to scan the folder with the `.nomedia` file, effectively making the folder appear invisible to the user.

This technique is often used by stalkerware and spyware applications.

## Kill Chain Phase

- Defense Evasion (TA0030)

**Platforms:** Android

## What to Check

- [ ] Identify if Conceal Multimedia Files technique is applicable to target mobile environment
- [ ] Check Android devices for indicators of Conceal Multimedia Files
- [ ] Verify mitigations are bypassed or absent (1 known mitigations)
- [ ] Assess detection coverage (1 detection strategies)

## How to Test

### Identify Attack Surface

Determine if the target mobile environment is susceptible to Conceal Multimedia Files by examining the target platforms (Android).

### Assess Existing Defenses

Review whether mitigations for T1628.003 are in place. If defenses are absent or misconfigured, this technique may be exploitable.

## Remediation Guide

### M1059 Do Not Mitigate

Conceal Multimedia Files likely should not be mitigated with preventative controls because the `.nomedia` file may be used legitimately.

## Detection

### Detection of Conceal Multimedia Files

## Risk Assessment

| Finding                                       | Severity | Impact          |
| --------------------------------------------- | -------- | --------------- |
| Conceal Multimedia Files technique applicable | Low      | Defense Evasion |

## CWE Categories

| CWE ID  | Title                        |
| ------- | ---------------------------- |
| CWE-693 | Protection Mechanism Failure |

## References

- [MITRE ATT&CK Mobile - T1628.003](https://attack.mitre.org/techniques/T1628/003)