Network Connection Enumeration

Network Connection Enumeration
Technique
ID	T0840
Tactic	Discovery
Data Sources	Process monitoring, API monitoring
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

Industroyer contains an IEC 61850 module that enumerates all connected network adapters to determine their TCP/IP subnet masks.2

Mitigations

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

References

^ MITRE. (n.d.). System Network Connections Discovery. Retrieved May 31, 2018.

^ 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	Data Historian Compromise Drive-by Compromise Engineering Workstation Compromise Exploit Public-Facing Application External Remote Services Initial Access Internet Accessible Device Replication Through Removable Media Spearphishing Attachment Supply Chain Compromise Wireless Compromise

Execution	Change Program State Command-Line Interface Execution Execution through API Graphical User Interface Man in the Middle Program Organization Units Project File Infection Scripting User Execution

Persistence	Hooking Module Firmware Persistence Program Download Project File Infection System Firmware Valid Accounts

Evasion	Evasion Exploitation for Evasion Indicator Removal on Host Masquerading Rogue Master Device Rootkit Spoof Reporting Message Utilize/Change Operating Mode

Discovery	Control Device Identification Discovery I/O Module Discovery Network Connection Enumeration Network Service Scanning Network Sniffing Remote System Discovery Serial Connection Enumeration

Lateral Movement	Default Credentials Exploitation of Remote Services External Remote Services Lateral Movement Program Organization Units Remote File Copy Valid Accounts

Collection	Automated Collection Collection Data from Information Repositories Detect Operating Mode Detect Program State I/O Image Location Identification Monitor Process State Point & Tag Identification Program Upload Role Identification Screen Capture

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 Modify Control Logic Program Download Rootkit System Firmware Utilize/Change Operating Mode

Impair Process Control	Brute Force I/O Change Program State Impair Process Control Masquerading Modify Control Logic Modify Parameter Module Firmware Program Download Rogue Master Device Service Stop 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 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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