Remote System Discovery
|Remote System Discovery|
|Platform||Linux, macOS, Windows|
|Permissions Required||User, Administrator, SYSTEM|
|Data Sources||Network protocol analysis, Process command-line parameters, Process monitoring, Process use of network|
Adversaries will likely 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 current system. Functionality could exist within remote access tools to enable this, but utilities available on the operating system could also be used.
Examples of tools and commands that acquire this information include "ping" or "net view" using Net.
Specific to Mac, the
bonjour protocol to discover additional Mac-based systems within the same broadcast domain. Utilities such as "ping" and others can be used to gather information about remote systems.
Utilities such as "ping" and others can be used to gather information about remote systems.
- APT3 has a tool that can detect the existence of remote systems.12
- BRONZE BUTLER typically use
pingand Net to enumerate systems.3
- FIN5 has used the open source tool Essential NetTools to map the network and build a list of targets.4
- FIN6 used publicly available tools (including Microsoft's built-in SQL querying tool, osql.exe) to map the internal network and conduct reconnaissance against Active Directory, Structured Query Language (SQL) servers, and NetBIOS.5
- FIN8 uses dsquery and other Active Directory utilities to enumerate hosts.6
- Turla surveys a system upon check-in to discover remote systems on a local network using the
net view /DOMAINcommands.7
- menuPass uses scripts to enumerate IP ranges on the victim network.8 menuPass has also issued the command
net view /domainto a PlugX implant to gather information about remote systems on the network.9
- Cobalt Strike uses the native Windows Network Enumeration APIs to interrogate and discover targets in a Windows Active Directory network.10
- MURKYTOP has the capability to identify remote hosts on connected networks.11
- Commands such as
net viewcan be used in Net to gather information about available remote systems.12
- OSInfo performs a connection test to discover remote systems in the network 1
- Ping can be used to identify remote systems within a network.13
- Remsec can ping or traceroute a remote host.14
- SHOTPUT has a command to list all servers in the domain, as well as one to locate domain controllers on a domain.15
- Shamoon scans the C-class subnet of the IPs on the victim's interfaces.16
- Sykipot may use
net view /domainto display hostnames of available systems on a network.17
Identify unnecessary system utilities or potentially malicious software that may be used to acquire information on remotely available systems, and audit and/or block them by using whitelisting18 tools, like AppLocker,1920 or Software Restriction Policies21 where appropriate.22
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.
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- Counter Threat Unit Research Team. (2017, October 12). BRONZE BUTLER Targets Japanese Enterprises. Retrieved January 4, 2018.
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- FireEye Threat Intelligence. (2016, April). Follow the Money: Dissecting the Operations of the Cyber Crime Group FIN6. Retrieved June 1, 2016.
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- Microsoft. (n.d.). Ping. Retrieved April 8, 2016.
- Kaspersky Lab's Global Research & Analysis Team. (2016, August 9). The ProjectSauron APT. Technical Analysis. Retrieved August 17, 2016.
- Falcone, R. and Wartell, R.. (2015, July 27). Observations on CVE-2015-3113, Prior Zero-Days and the Pirpi Payload. Retrieved January 22, 2016.
- FireEye. (2016, November 30). FireEye Responds to Wave of Destructive Cyber Attacks in Gulf Region. Retrieved January 11, 2017.
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- Beechey, J. (2010, December). Application Whitelisting: Panacea or Propaganda?. Retrieved November 18, 2014.
- Tomonaga, S. (2016, January 26). Windows Commands Abused by Attackers. Retrieved February 2, 2016.
- NSA Information Assurance Directorate. (2014, August). Application Whitelisting Using Microsoft AppLocker. Retrieved March 31, 2016.
- Corio, C., & Sayana, D. P. (2008, June). Application Lockdown with Software Restriction Policies. Retrieved November 18, 2014.
- Microsoft. (2012, June 27). Using Software Restriction Policies and AppLocker Policies. Retrieved April 7, 2016.