Step 1: Define the Problem and Objective
Objective:
* Identify thefile containing the rulesetforEternalBlue connections.
* Include thefile extensionin the response.
Context:
* The organization is experiencingfalse positive alertsfor theEternalBlue vulnerability.
* The rulesets are located at:
/home/administrator/hids/ruleset/rules
* We need to find the specific file associated withEternalBlue.
Step 2: Prepare for Access
2.1: SIEM Access Details:
* URL:
https://10.10.55.2
* Username:
[email protected]* 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
[email protected]* Password:
Security-Analyst!
* If prompted about SSH key verification, typeyesto 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" *
* Explanation:
* 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
* 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 Answer:
* Ruleset File Name:
exploit_eternalblue.rules
