Scenario: You work for a government agency that, for security reasons, maintains tight controls over access to certain systems. The CISO is concerned about privilege escalation in which an adversary gains an initial foothold on a host and then exploits its weaknesses to increase their privileges. By increasing their privilege level, the attacker can gain the control required to carry out malicious ends. As a security analyst, you need to recommend a series of searches that will help prevent such attacks in the agency.
How Splunk software can help
The Splunk Security Research team developed this use case to help you detect and investigate behaviors that attackers may use to elevate their privileges in your environment.
What you need
To succeed in implementing this use case, you need the following dependencies, resources, and information.
The best person to implement this use case is a security analyst who is familiar with authentication, endpoint, and web server data. This person might come from your team, a Splunk partner, or Splunk OnDemand Services.
Monitoring for signs of Windows privilege escalation attacks can take only a few minutes each day.
The following technologies, data, and integrations are useful in successfully implementing this use case:
- Splunk Enterprise or Splunk Cloud
- Common Information Model
- Data sources onboarded
- Endpoint data
- Authentication data
- Web server data
How to use Splunk software for this use case
You can run many searches with Splunk software to monitor for signs of Windows privilege escalation attacks. Depending on what information you have available, you might find it useful to run some or all of the following:
- Child processes of Spoolsv.exe
- Windows accessibility binary modifications
- Registry keys used for privilege escalation
- Uncommon processes on endpoint
If you identify suspicious behavior, you can investigate further using these searches:
- Authentication logs for an endpoint
- Processes running on a host
- Registry activities
- Web activities from a host
Other steps you can take
To maximize their benefit, the how-to articles linked in the previous section likely need to tie into existing processes at your organization or become new standard processes. These processes commonly impact success with this use case:
- Creating a golden image of common processes run by your organization
- Actively monitoring the registry changes happening across machines
- Quickly investigating anomalous processes using SOAR tools, if possible, to scale
These additional Splunk resources might help you understand and implement this use case:
- Conf Talk: Real world cases of insider threat
- Blog: Spotting the signs of lateral movement
- Blog: Get more flexibility and accelerated searches with the new endpoint data model
How to assess your results
Measuring impact and benefit is critical to assessing the value of security operations. The following are example metrics that can be useful to monitor when implementing this use case:
- Number of unlikely processes and users making registry changes: A high number is an indicator of anomalous behavior that might be related to privilege escalation
- Number of hosts with uncommon processes in your organization: A high number might be an indicator of privilege escalation