Step 1: Define the Problem and Objective
Objective:
Identify the file containing the ruleset for EternalBlue connections.
Include the file extension in the response.
Context:
The organization is experiencing false positive alerts for the EternalBlue vulnerability.
The rulesets are located at:
/home/administrator/hids/ruleset/rules
We need to find the specific file associated with EternalBlue.
Step 2: Prepare for Access
2.1: SIEM Access Details:
URL:
https://10.10.55.2
Username:
ccoatest@isaca.org
Password:
Security-Analyst!
Ensure your machine has access to the SIEM system via HTTPS.
Step 3: Access the SIEM System
3.1: Connect via SSH (if needed)
Open a terminal and connect:
ssh administrator@10.10.55.2
Password:
Security-Analyst!
If prompted about SSH key verification, type yes to continue.
Step 4: Locate the Ruleset File
4.1: Navigate to the Ruleset Directory
Change to the ruleset directory:
cd /home/administrator/hids/ruleset/rules
ls -l
You should see a list of files with names indicating their purpose.
4.2: Search for EternalBlue Ruleset
Use grep to locate the EternalBlue rule:
grep -irl 'eternalblue' *
grep -i: Case-insensitive search.
-r: Recursive search within the directory.
-l: Only print file names with matches.
'eternalblue': The keyword to search.
*: All files in the current directory.
Expected Output:
exploit_eternalblue.rules
Filename:
exploit_eternalblue.rules
The file extension is .rules, typical for intrusion detection system (IDS) rule files.
Step 5: Verify the Content of the Ruleset File
5.1: Open and Inspect the File
Use less to view the file contents:
less exploit_eternalblue.rules
Check for rule patterns like:
alert tcp $EXTERNAL_NET any -> $HOME_NET 445 (msg:'EternalBlue SMB Exploit'; ...)
Use the search within less:
/eternalblue
Purpose: Verify that the file indeed contains the rules related to EternalBlue.
Step 6: Document Your Findings
Answe r:
Ruleset File for EternalBlue:
exploit_eternalblue.rules
File Path:
/home/administrator/hids/ruleset/rules/exploit_eternalblue.rules
Reasoning: This file specifically mentions EternalBlue and contains the rules associated with detecting such attacks.
Step 7: Recommendation
Mitigation for False Positives:
Update the Ruleset:
Modify the file to reduce false positives by refining the rule conditions.
Update Signatures:
Check for updated rulesets from reliable threat intelligence sources.
Whitelist Known Safe IPs:
Add exceptions for legitimate internal traffic that triggers the false positives.
Implement Tuning:
Adjust the SIEM correlation rules to decrease alert noise.
Final Verification:
Restart the IDS service after modifying rules to ensure changes take effect:
sudo systemctl restart hids
Check the status:
sudo systemctl status hids
Final Answe r:
Ruleset File Name:
exploit_eternalblue.rules
