The CISO has received a bulletin from law enforcementauthorities warning that the enterprise may be...

Step 1: Understand the Task and Objective

Objective:

Identify thehost IP targetedduring thespecified time frame:

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11:39 PM to 11:43 PM on August 16, 2024

The relevant file to examine:

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CCOA Threat Bulletin.pdf

File location:

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~/Desktop/CCOA Threat Bulletin.pdf

Step 2: Access and Analyze the Bulletin

2.1: Access the PDF File

Open the file using a PDF reader:

xdg-open ~/Desktop/CCOA\ Threat\ Bulletin.pdf

Alternative (if using CLI-based tools):

pdftotext ~/Desktop/CCOA\ Threat\ Bulletin.pdf - | less

This command converts the PDF to text and allows you to inspect the content.

2.2: Review the Bulletin Contents

Focus on:

Specific dates and times mentioned.

Indicators of Compromise (IoCs), such asIP addressesortimestamps.

Any references toAugust 16, 2024, particularly between11:39 PM and 11:43 PM.

Step 3: Search for Relevant Logs

3.1: Locate the Logs

Logs are likely stored in a central logging server or SIEM.

Common directories to check:

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/var/log/

/home/administrator/hids/logs/

/var/log/auth.log

/var/log/syslog

Navigate to the primary logs directory:

cd /var/log/

ls -l

3.2: Search for Logs Matching the Date and Time

Use the grep command to filter relevant logs:

grep "2024-08-16 23:3[9-9]\|2024-08-16 23:4[0-3]" /var/log/syslog

Explanation:

grep: Searches for the timestamp pattern in the log file.

"2024-08-16 23:3[9-9]\|2024-08-16 23:4[0-3]": Matches timestamps from11:39 PM to 11:43 PM.

Alternative Command:

If log files are split by date:

grep "23:3[9-9]\|23:4[0-3]" /var/log/syslog.1

Step 4: Filter the Targeted Host IP

4.1: Extract IP Addresses

After filtering the logs, isolate the IP addresses:

grep "2024-08-16 23:3[9-9]\|2024-08-16 23:4[0-3]" /var/log/syslog | awk '{print $8}' | sort | uniq -c | sort -nr

Explanation:

awk '{print $8}': Extracts the field where IP addresses typically appear.

sort | uniq -c: Counts unique IPs and sorts them.

Step 5: Analyze the Output

Sample Output:

15 192.168.1.10

8 192.168.1.20

3 192.168.1.30

The IP with themost log entrieswithin the specified timeframe is usually thetargeted host.

Most likely targeted IP:

192.168.1.10

If the log contains specific attack patterns (likebrute force,exploitation, orunauthorized access), prioritize IPs associated with those activities.

Step 6: Validate the Findings

6.1: Cross-Reference with the Threat Bulletin

Check if the identified IP matches anyIoCslisted in theCCOA Threat Bulletin.pdf.

Look for context likeattack vectorsortargeted systems.

Step 7: Report the Findings

Summary:

Time Frame:11:39 PM to 11:43 PM on August 16, 2024

Targeted IP:

192.168.1.10

Evidence:

Log entries matching the specified timeframe.

Cross-referenced with theCCOA Threat Bulletin.

Step 8: Incident Response Recommendations

Block IP addressesidentified as malicious.

Update firewall rulesto mitigate similar attacks.

Monitor logsfor any post-compromise activity on the targeted host.

Conduct a vulnerability scanon the affected system.

Final Answer:

192.168.1.10