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Attack: Indicator Removal on Host: Clear FreeBSD, Linux or Mac System Logs

Adversaries may clear system logs to hide evidence of an intrusion. macOS and Linux both keep track of system or user-initiated actions via system logs. The majority of native system logging is stored under the /var/log/ directory. Subfolders in this directory categorize logs by their related functions, such as:(Citation: Linux Logs)

• /var/log/messages:: General and system-related messages
• /var/log/secure or /var/log/auth.log: Authentication logs
• /var/log/utmp or /var/log/wtmp: Login records
• /var/log/kern.log: Kernel logs
• /var/log/cron.log: Crond logs
• /var/log/maillog: Mail server logs
• /var/log/httpd/: Web server access and error logs

MITRE

Tactic

• defense-evasion

technique

• T1070.002

Test : Delete system journal logs via rm and journalctl utilities

OS

• linux

Description:

The first sub-test deletes the journal files using rm utility in the “/var/log/journal/” directory and the second sub-test clears the journal by modifiying time period of logs that should be retained to zero.

Executor

sh

Sigma Rule

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