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Correct Answer: B  🗳️

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Correct Answer: D  🗳️

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Correct Answer:

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

Correct Answer:

See the solution in Explanation.
Explanation:
To determine the host IP of the machine vulnerable toCVE-2021-22145usingGreenbone Vulnerability Manager (GVM), follow these detailed steps:
Step 1: Access Greenbone Vulnerability Manager
* OpenFirefoxon your system.
* Go to the GVM login page:
URL: https://10.10.55.4:9392
* Enter the credentials:
Username: admin
Password: Secure-gvm!
* ClickLoginto access the dashboard.
Step 2: Navigate to Scan Reports
* Once logged in, locate the"Scans"menu on the left panel.
* Click on"Reports"under the"Scans"section to view the list of completed vulnerability scans.
Step 3: Identify the Most Recent Scan
* Check thedate and timeof the last completed scan, as your colleague likely used the latest one.
* Click on theReport NameorDateto open the detailed scan results.
Step 4: Filter for CVE-2021-22145
* In the report view, locate the"Search"or"Filter"box at the top.
* Enter the CVE identifier:
CVE-2021-22145
* PressEnterto filter the vulnerabilities.
Step 5: Analyze the Results
* The system will display any host(s) affected byCVE-2021-22145.
* The details will typically include:
* Host IP Address
* Vulnerability Name
* Severity Level
* Vulnerability Details
Example Display:
Host IP
Vulnerability ID
CVE
Severity
192.168.1.100
SomeVulnName
CVE-2021-22145
High
Step 6: Verify the Vulnerability
* Click on the host IP to see thedetailed vulnerability description.
* Check for the following:
* Exploitability: Proof that the vulnerability can be actively exploited.
* Description and Impact: Details about the vulnerability and its potential impact.
* Fixes/Recommendations: Suggested mitigations or patches.
Step 7: Note the Vulnerable Host IP
* The IP address that appears in the filtered list is thevulnerable machine.
Example Answer:
The host IP of the machine vulnerable to CVE-2021-22145 is: 192.168.1.100 Step 8: Take Immediate Actions
* Isolate the affected machineto prevent exploitation.
* Patch or updatethe software affected by CVE-2021-22145.
* Perform a quick re-scanto ensure that the vulnerability has been mitigated.
Step 9: Generate a Report for Documentation
* Export the filtered scan results as aPDForHTMLfrom the GVM.
* Include:
* Host IP
* CVE ID
* Severity and Risk Level
* Remediation Steps
Background on CVE-2021-22145:
* This CVE is related to a vulnerability in certain software, often associated withimproper access control orauthentication bypass.
* Attackers can exploit this to gain unauthorized access or escalate privileges.

Correct Answer: A  🗳️

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