Network Connection Enumeration

Network Connection Enumeration
Technique
ID	T0840
Tactic	Discovery
Data Sources	Command: Command Execution, Process: OS API Execution, Process: Process Creation
Asset	Human-Machine Interface

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 1. The adversary can also use Network Sniffing to watch network traffic for details about the source, destination, protocol, and content.

Procedure Examples

EKANS performs a DNS lookup of an internal domain name associated with its target network to identify if it was deployed on the intended system.2
Industroyer contains an IEC 61850 module that enumerates all connected network adapters to determine their TCP/IP subnet masks.3

Mitigations

Mitigation Limited or Not Effective - Network connection enumeration is likely obtained by using common system tools (e.g., netstat, ipconfig).

References

^ Anton Cherepanov, ESET. (2017, June 12). Win32/Industroyer: A new threat for industrial control systems. Retrieved September 15, 2017.

v · d · e Adversary Techniques

Initial Access	Drive-by Compromise Exploit Public-Facing Application Exploitation of Remote Services External Remote Services Initial Access Internet Accessible Device Remote Services Replication Through Removable Media Rogue Master Spearphishing Attachment Supply Chain Compromise Transient Cyber Asset Wireless Compromise

Execution	Change Operating Mode Command-Line Interface Execution Execution through API Graphical User Interface Hooking Modify Controller Tasking Native API Scripting User Execution

Persistence	Modify Program Module Firmware Persistence Project File Infection System Firmware Valid Accounts

Evasion	Change Operating Mode Evasion Exploitation for Evasion Indicator Removal on Host Masquerading Rootkit Spoof Reporting Message

Discovery	Discovery Network Connection Enumeration Network Sniffing Remote System Discovery Remote System Information Discovery Wireless Sniffing

Lateral Movement	Default Credentials Exploitation of Remote Services Lateral Movement Lateral Tool Transfer Program Download Remote Services Valid Accounts

Collection	Automated Collection Collection Data from Information Repositories Detect Operating Mode I/O Image Man in the Middle Monitor Process State Point & Tag Identification Program Upload Screen Capture Wireless Sniffing

Inhibit Response Function	Activate Firmware Update Mode Alarm Suppression Block Command Message Block Reporting Message Block Serial COM Data Destruction Denial of Service Device Restart/Shutdown Inhibit Response Function Manipulate I/O Image Modify Alarm Settings Rootkit Service Stop System Firmware

Impair Process Control	Brute Force I/O Impair Process Control Modify Parameter Module Firmware Spoof Reporting Message Unauthorized Command Message

Impact	Damage to Property Denial of Control Denial of View Impact Loss of Availability Loss of Control Loss of Productivity and Revenue Loss of Protection Loss of Safety Loss of View Manipulation of Control Manipulation of View Theft of Operational Information

Network Connection Enumeration

Description

Procedure Examples

Mitigations

References

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