Remote System Discovery

Adversaries may attempt to get a listing of other systems by IP address, hostname, or other logical identifier on a network that may be used for Lateral Movement from the compromised system.

Adversaries can some functionalities within remote access tools and operating system utilities and files. To discover SSH Remote Services, adversaries will look for known_hosts file to discover additional machines.

Procedure Examples

Name Description
APT39

APT39 has used nbtscan and custom tools to discover remote systems. [1][2][3]

Cobalt Strike

Cobalt Strike uses the native Windows Network Enumeration APIs to interrogate and discover targets in a Windows Active Directory network.[4]

Rocke

Rocke looks for IP addresses in the known_hosts file on the infected system and attempts to connect to them through SSH.[5]

TrickBot

TrickBot enumerates computers and network devices for Lateral Movement.[6]

Mitigations

This type of attack technique cannot be easily mitigated with preventive controls since it is based on the abuse of system features.

Detection

System and network discovery techniques normally occur throughout an operation as an adversary learns the environment. Data and events should not be viewed in isolation, but as part of a chain of behavior that could lead to other activities, such as Lateral Movement, based on the information obtained.

Normal, benign system and network events related to legitimate remote system discovery may be uncommon, depending on the environment and how they are used. Monitor processes and command-line arguments for actions that could be taken to gather system and network information. Remote access tools with built-in features may interact directly with the Windows API to gather information. Information may also be acquired through Windows system management tools such as Windows Management Instrumentation and PowerShell.

References

Attachments

ID
VT0034
MITRE ID
Sub-techniques
No sub-techniques
Tactic
Discovery
Platforms
Linux
Windows
macOS
Permissions Required
Administrator
SYSTEM
User
Data Sources
Network protocol analysis
Process command-line parameters
Process monitoring
Process use of network
CAPEC ID
Version
3.0

Created: 16 March 2021

Last Modified: 16 March 2021