# T1592.004_client-configurations

> Adversaries may gather information about the victim's client configurations that can be used during targeting.

- Skill: `cyberstrikeus/t1592-004-client-configurations` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/t1592-004-client-configurations`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/t1592-004-client-configurations/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/t1592-004-client-configurations

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# T1592.004 Client Configurations

> **Sub-technique of:** T1592

## High-Level Description

Adversaries may gather information about the victim's client configurations that can be used during targeting. Information about client configurations may include a variety of details and settings, including operating system/version, virtualization, architecture (ex: 32 or 64 bit), language, and/or time zone.

Adversaries may gather this information in various ways, such as direct collection actions via Active Scanning (ex: listening ports, server banners, user agent strings) or Phishing for Information. Adversaries may also compromise sites then include malicious content designed to collect host information from visitors. Information about the client configurations may also be exposed to adversaries via online or other accessible data sets (ex: job postings, network maps, assessment reports, resumes, or purchase invoices). Gathering this information may reveal opportunities for other forms of reconnaissance (ex: Search Open Websites/Domains or Search Open Technical Databases), establishing operational resources (ex: Develop Capabilities or Obtain Capabilities), and/or initial access (ex: Supply Chain Compromise or External Remote Services).

## Kill Chain Phase

- Reconnaissance (TA0043)

**Platforms:** PRE

## What to Check

- [ ] Identify if Client Configurations technique is applicable to target environment
- [ ] Check PRE systems for indicators of Client Configurations
- [ ] 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 Client Configurations by examining the target platforms (PRE).

2. **Assess Existing Defenses**: Review whether mitigations for T1592.004 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](https://github.com/redcanaryco/atomic-red-team) for updates.

## Remediation Guide

### M1056 Pre-compromise

This technique cannot be easily mitigated with preventive controls since it is based on behaviors performed outside of the scope of enterprise defenses and controls. Efforts should focus on minimizing the amount and sensitivity of data available to external parties.

## Detection

### Detection of Client Configurations

## Risk Assessment

| Finding                                    | Severity | Impact         |
| ------------------------------------------ | -------- | -------------- |
| Client Configurations technique applicable | High     | Reconnaissance |

## CWE Categories

| CWE ID  | Title                             |
| ------- | --------------------------------- |
| CWE-200 | Exposure of Sensitive Information |

## References

- [ATT ScanBox](https://cybersecurity.att.com/blogs/labs-research/scanbox-a-reconnaissance-framework-used-on-watering-hole-attacks)
- [ThreatConnect Infrastructure Dec 2020](https://threatconnect.com/blog/infrastructure-research-hunting/)
- [Atomic Red Team - T1592.004](https://github.com/redcanaryco/atomic-red-team/tree/master/atomics/T1592.004)
- [MITRE ATT&CK - T1592.004](https://attack.mitre.org/techniques/T1592/004)