LinuxHostThreatHunting

Find Command Line Execution T1059.004

  1. Look within the user home directories for .bash_history.

  2. Look for aliasing within .bashrc in the user home directory.

Find USB Devices T1025

  1. Look at usb strings within /var/log/syslog.

  2. Look at dmesg strings within /var/log/syslog.

Find Hidden Files T1564.001

  1. Use osqueryi with SELECT filename, path, directory, size, type FROM file WHERE path LIKE '/.%';.

Explore Process Thread Activity T1134.003 T1574.005 T1574.010 T1055.003 T1055.005 T1620

  1. On the command line, use lsof to examine process calls and possible network connections.

  2. On the command line, use osqueryi to examine processes with SELECT pid, fd, socket, local_address, remote_address FROM process_open_sockets WHERE pid = [PID];.

  3. View process execution with pspy.

  4. Look for aliasing within .bashrc in the user home directory.

Examine Executables T1547.004 T1059.006 T1559.001 T1027.004 T1027.004 T1055.002

  1. On the command line, use lsof to examine process calls and possible network connections.

  2. On the command line, use osqueryi to examine processes with SELECT pid, fd, socket, local_address, remote_address FROM process_open_sockets WHERE pid = [PID];.

  3. Look for aliasing within .bashrc in the user home directory.

Explore Processes T1059 T1055

  1. On the command line, use lsof to examine process calls and possible network connections.

  2. On the command line, use osqueryi to examine processes with SELECT pid, fd, socket, local_address, remote_address FROM process_open_sockets WHERE pid = [PID];.

  3. View process execution with pspy.

  4. Find all running processes using osqueryi wiht SELECT pid, name, path, state FROM processes;.

  5. Find the open files associated with a running process using osueryi with the process_open_files_ table.

  6. Look for aliasing within .bashrc in the user home directory.

User Creation T1136

  1. Look within auth.log for useradd events.

  2. Look within /etc/passwd for another user creation.

  3. If service based, look within journalctl output for the specific service.

  4. Use osqueryi with Select username, uid, description from users; to find all users.

Explore Scheduled Tasks/CronJobs T1036.004 T1053.005

  1. Look within /var/spool/crontab to find each cronjob associated with each user.

  2. Look at the system level crontabs with /etc/crontab.

  3. A helpful resource can be found here.

  4. Use the crontab command to view the user crontabs.

  5. Loop through each of the users and find the crontabs with sudo bash -c 'for user in $(cut -f1 -d: /etc/passwd); do entries=$(crontab -u $user -l 2>/dev/null | grep -v "^#"); if [ -n "$entries" ]; then echo "$user: Crontab entry found!"; echo "$entries"; echo; fi; done'.

  6. Look for cron execution within /var/log/syslog.

  7. View process execution and focus on cronjobs using pspy.

  8. Find the system level crobjobs within /etc/ within ```

Find Service Creation T1569.002 T1543.003

  1. Look within /etc/systemd/service to find anomalous services.

  2. Look within the logs at /var/log/syslog.

  3. Find using journalctl on the command line.

  4. Run the command systemctl list-units --type=service --state=running to find all running services.

  5. Find information about the service within /etc/systemd/system.

Find Installed Packages T1072

  1. Use the command dpkg -l on the system.

  2. Search for package installs within /var/log/dpkg.log.

  3. Use the command apt list --installed.

View User Authentications T1078

  1. Look at /var/log/auth.log file and focus on authentications with Accepted Password or Sessions opened.

  2. View login and logout activity with /var/log/btmp and /var/log/wtmp.

  3. Look for gdm-password within auth.log.

Find Autostarts T1547

  1. Look for files within /etc/init.d, /etc/rc.d, and /etc/systemd/system.

  2. User specific autostrart scripts can be found in ~/.config/autostart and ~/.config.

Find Vim Use T1059.004

  1. Look within the user .viminfo file saved in their home directory.

Find Browser Artifacts T1606.001 T1539 T1550.004 T1189 T1203T1608.004 T1218.001 T1218.005 T1204.001 T1176 T1185

  1. Look within user home directory for .mozilla/firefox or .config/googlechrome files.

  2. Use dumpzilla.

Look for Kernel Exploits T1014

  1. View log entries within /var/log/kern.log and /var/log/desmg.

  2. Use the dmesg command to find recent kernel events.

  3. Look for log files with kernel in /var/log/syslog.

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