---
name: cyberstrikeus-t0840-network-connection-enumeration
description: "Adversaries may perform network connection enumeration to discover information about device communication patterns."
license: "AGPL-3.0"
metadata:
  decimalai-skill-id: "f2ab75b3-a308-4ad8-8457-d6503c1cb4ba"
  decimalai-version-id: "93df6a55-44be-4238-8a10-5f2aac82b00d"
  decimalai-version: "1"
  decimalai-body-sha256: "34c67da581fec232d8485587e3da544ea454e7e1e0c80fdfe0985958a9f9f369"
  decimalai-name: "cyberstrikeus/T0840_network-connection-enumeration"
  decimalai-format: "1"
  decimalai-invocation: "model"
  decimalai-category: "security"
  decimalai-source: "https://app.decimal.ai/s/cyberstrikeus-t0840-network-connection-enumeration@1/SKILL.md"
---
# T0840 Network Connection Enumeration

## High-Level Description

Adversaries may perform network connection enumeration to discover information about device communication patterns. If an adversary can inspect the state of a network connection with tools, such as Netstat, in conjunction with System Firmware, then they can determine the role of certain devices on the network . The adversary can also use Network Sniffing to watch network traffic for details about the source, destination, protocol, and content.

## Kill Chain Phase

- Discovery (TA0102)

**Platforms:** ICS

## What to Check

- [ ] Identify if Network Connection Enumeration technique is applicable to target ICS environment
- [ ] Check ICS/SCADA systems for indicators of Network Connection Enumeration
- [ ] 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 ICS/SCADA environment is susceptible to Network Connection Enumeration by examining operational technology systems and network architecture.

### Assess Existing Defenses

Review whether mitigations for T0840 are in place. If defenses are absent or misconfigured, this technique may be exploitable in the ICS environment.

## Remediation Guide

### M0816 Mitigation Limited or Not Effective

Network connection enumeration is likely obtained by using common system tools (e.g., netstat, ipconfig).

## Detection

### Detection of Network Connection Enumeration

## Risk Assessment

| Finding                                             | Severity | Impact    |
| --------------------------------------------------- | -------- | --------- |
| Network Connection Enumeration technique applicable | Low      | Discovery |

## CWE Categories

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

## References

- [MITRE](https://attack.mitre.org/wiki/Technique/T1049)
- [Netstat](https://en.wikipedia.org/wiki/Netstat)
- [MITRE ATT&CK ICS - T0840](https://attack.mitre.org/techniques/T0840)