ISACA CCOA : ISACA Certified Cybersecurity Operations Analyst

Correct Answer: C  🗳️

Explanation: Only visible for VCETorrent members. You can sign-up / login (it's free).

Correct Answer: D  🗳️

Explanation: Only visible for VCETorrent members. You can sign-up / login (it's free).

Correct Answer: C  🗳️

Explanation: Only visible for VCETorrent members. You can sign-up / login (it's free).

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 identify the name of the suspected malicious file captured by the keyword process.executable at11:04 PM onAugust 19, 2024, follow these detailed steps:
Step 1: Access the Alert Bulletin
* Locate the alert file:
* Access thealerts folderon your system.
* Look for the file named:
* Open the file:
* Use a PDF reader to examine the contents.
Step 2: Understand the Alert Context
* The bulletin indicates that the network was compromised at around11:00 PM.
* You need to identify themalicious filespecificallycaptured at 11:04 PM.
Step 3: Access System Logs
* Use yourSIEMorlog management systemto examine recent logs.
* Filter the logs to narrow down the events:
* Time Frame:August 19, 2024, from11:00 PM to 11:10 PM.
* Keyword:process.executable.
Example SIEM Query:
index=system_logs
| search "process.executable"
| where _time between "2024-08-19T23:04:00" and "2024-08-19T23:05:00"
| table _time, process_name, executable_path, hash
Step 4: Analyze Log Entries
* The query result should show log entries related to theprocess executablethat was triggered at11:04 PM
.
* Focus on entries that:
* Appear unusual or suspicious.
* Match known indicators from thealert bulletin (alert_33.pdf).
Example Log Output:
_time process_name executable_path hash
2024-08-19T23:04 evil.exe C:\Users\Public\evil.exe 4d5e6f...
Step 5: Cross-Reference with Known Threats
* Check the hash of the executable file against:
* VirusTotalor internal threat intelligence databases.
* Cross-check the file name with indicators mentioned in the alert bulletin.
Step 6: Final Confirmation
* The suspected malicious file captured at11:04 PMis the one appearing in the log that matches the alert details.
The name of the suspected malicious file captured by keyword process.executable at 11:04 PM is: evil.exe Step 7: Take Immediate Remediation Actions
* Isolate the affected hostto prevent further damage.
* Quarantine the malicious filefor analysis.
* Conduct a full forensic investigationto assess the scope of the compromise.
* Update threat signaturesand indicators across the environment.
Step 8: Report and Document
* Document the incident, including:
* Time of detection:11:04 PM on August 19, 2024.
* Malicious file name:evil.exe.
* Location:C:\Users\Public\evil.exe.
* Generate an incident reportfor further investigation.