LoFP / administrators may intentionally disable or modify logging during maintenance, troubleshooting, or device reconfiguration. these events should be verified against approved change management activities.

Techniques

• T1562

Sample rules

Cisco ASA - Logging Disabled via CLI

• source: splunk
• technicques:
  • T1562

Description

This analytic detects the disabling of logging functionality on a Cisco ASA device through CLI commands. Adversaries or malicious insiders may attempt to disable logging to evade detection and hide malicious activity. The detection looks for specific ASA syslog message IDs (111010, 111008) associated with command execution, combined with suspicious commands such as no logging, logging disable, clear logging, or no logging host. Disabling logging on a firewall or security device is a strong indicator of defense evasion.

Detection logic

`cisco_asa`
message_id IN (111008, 111010)
command IN (
    "*no logging*",
    "*logging disable*",
    "*clear logging*",
    "*no logging host*",
    "*no logging trap*"
)

| stats earliest(_time) as firstTime
        latest(_time) as lastTime
        values(user) as user
        values(action) as action
        values(message_id) as message_id
        values(command) as command
        values(src_ip) as src_ip
        values(process_name) as process_name
  by host

| `security_content_ctime(firstTime)`

| `security_content_ctime(lastTime)`

| `cisco_asa___logging_disabled_via_cli_filter`