ISACA Certified Cybersecurity Operations Analyst CCOA Exam Questions with Experts Answers Updated Recently

To identify the compromised host using thekeyword agent.name, follow these steps:

Step 1: Access the Alert Bulletin

Navigate to thealerts folderon your system.

Locate the alert file:

alert_33.pdf

Open the file with a PDF reader and review its contents.

Key Information to Extract:

Indicators of Compromise (IOCs) provided in the bulletin:

File hashes

IP addresses

Hostnames

Keywords related to the compromise

Step 2: Log into SIEM or Log Management System

Access your organization'sSIEMor centralized log system.

Make sure you have the appropriate permissions to view log data.

Step 3: Set Up Your Search

Time Filter:

Set the time window toAugust 19, 2024, around11:00 PM (Absolute).

Keyword Filter:

Use the keywordagent.nameto search for host information.

IOC Correlation:

Incorporate IOCs from thealert_33.pdffile (e.g., IP addresses, hash values).

Example SIEM Query:

index=host_logs

| search "agent.name" AND (IOC_from_alert OR "2024-08-19T23:00:00")

| table _time, agent.name, host.name, ip_address, alert_id

Step 4: Analyze the Results

Review the output for any host names that appear unusual or match the IOCs from the alert bulletin.

Focus on:

Hostnames that appeared at 11:00 PM

Correlation with IOC data(hash, IP, filename)

Example Output:

_time agent.name host.name ip_address alert_id

2024-08-19T23:01 CompromisedAgent COMP-SERVER-01 192.168.1.101 alert_33

Step 5: Verify the Host

Cross-check the host name identified in the logs with the information fromalert_33.pdf.

Ensure the host name corresponds to the malicious activity noted.

The host name identified in the keyword agent.name field is: COMP-SERVER-01

Step 6: Mitigation and Response

Isolate the Compromised Host:

Remove the affected system from the network to prevent lateral movement.

Conduct Forensic Analysis:

Inspect system processes, logs, and network activity.

Patch and Update:

Apply security updates and patches.

Threat Hunting:

Look for signs of compromise in other systems using the same IOCs.

Step 7: Document and Report

Create a detailed incident report:

Date and Time:August 19, 2024, at 11:00 PM

Compromised Host Name:COMP-SERVER-01

Associated IOCs:(as per alert_33.pdf)

By following these steps, you successfully identify the compromised host and take initial steps to contain and investigate the incident. Let me know if you need further assistance!

To identify thefile namethat triggered theRuleName: Suspicious PowerShellon theaccounting-pcworkstation, follow these detailed steps:

Step 1: Access the SIEM System

Open your web browser and navigate to theSIEM dashboard.

Log in with youradministrator credentials.

Step 2: Set Up the Query

Go to theSearchorQuerysection of the SIEM.

Set theTime Rangeto thelast 24 hours.

Query Parameters:

Agent Name:accounting-pc

Rule Name:Suspicious PowerShell

Event Type:Startup items or Process creation

Step 3: Construct the SIEM Query

Here’s an example of how to construct the query:

Example Query (Splunk):

index=windows_logs

| search agent.name="accounting-pc" RuleName="Suspicious PowerShell"

| where _time > now() - 24h

| table _time, agent.name, process_name, file_path, RuleName

Example Query (Elastic SIEM):

{

"query": {

"bool": {

"must": [

{ "match": { "agent.name": "accounting-pc" }},

{ "match": { "RuleName": "Suspicious PowerShell" }},

{ "range": { "@timestamp": { "gte": "now-24h" }}}

]

}

}

}

Step 4: Analyze the Query Results

The query should return a table or list containing:

Time of Execution

Agent Name:accounting-pc

Process Name

File Path

Rule Name

Example Output:

_time

agent.name

process_name

file_path

RuleName

2024-04-07T10:45:23

accounting-pc

powershell.exe

C:\Users\Accounting\AppData\Roaming\calc.ps1

Suspicious PowerShell

Step 5: Identify the Suspicious File

Theprocess_namein the output showspowershell.exeexecuting a suspicious script.

Thefile pathindicates the script responsible:

makefile

C:\Users\Accounting\AppData\Roaming\calc.ps1

The suspicious script file is:

calc.ps1

Step 6: Confirm the Malicious Nature

Manual Inspection:

Navigate to the specified file path on theaccounting-pcworkstation.

Check the contents of calc.ps1 for any malicious PowerShell code.

Hash Verification:

Generate theSHA256 hashof the file and compare it with known malware signatures.

Answer:

calc.ps1

Step 7: Immediate Response

Isolate the Workstation:Disconnectaccounting-pcfrom the network.

Terminate the Malicious Process:

Stop the powershell.exe process running calc.ps1.

Use Task Manager or a script:

powershell

Stop-Process -Name "powershell" -Force

Remove the Malicious Script:

powershell

Remove-Item "C:\Users\Accounting\AppData\Roaming\calc.ps1" -Force

Scan for Persistence Mechanisms:

CheckStartup itemsandScheduled Tasksfor any references to calc.ps1.

Step 8: Documentation

Record the following:

Date and Time:When the incident was detected.

Affected Host:accounting-pc

Malicious File:calc.ps1

Actions Taken:File removal and process termination.