T1148 - HISTCONTROL
HISTCONTROLenvironment variable keeps track of what should be saved by the
historycommand and eventually into the
~/.bash_historyfile when a user logs out. This setting can be configured to ignore commands that start with a space by simply setting it to "ignorespace".
HISTCONTROLcan also be set to ignore duplicate commands by setting it to "ignoredups". In some Linux systems, this is set by default to "ignoreboth" which covers both of the previous examples. This means that “ ls” will not be saved, but “ls” would be saved by history.
HISTCONTROLdoes not exist by default on macOS, but can be set by the user and will be respected. Adversaries can use this to operate without leaving traces by simply prepending a space to all of their terminal commands.
How to Detect
Simulating the attack
Data sources required to detect the attack
Splunk Queries to detect the attack
index=linux sourcetype="bash_history" export HISTCONTROL | table host, user_name, bash_command