Elastic medium stable eql
Tampering of Shell Command-Line History
Adversaries may attempt to clear or disable the Bash command-line history in an attempt to evade detection or forensic investigations.
Detection Logic
process where event.action in ("exec", "exec_event", "executed", "process_started") and event.type == "start" and
(
(
(process.args : ("rm", "echo") or
(process.args : "ln" and process.args : "-sf" and process.args : "/dev/null") or
(process.args : "truncate" and process.args : "-s0")
)
and process.args : (
".bash_history", "/root/.bash_history", "/home/*/.bash_history","/Users/.bash_history", "/Users/*/.bash_history",
".zsh_history", "/root/.zsh_history", "/home/*/.zsh_history", "/Users/.zsh_history", "/Users/*/.zsh_history"
)
) or
(process.args : "history" and process.args : "-c") or
(process.args : "export" and process.args : ("HISTFILE=/dev/null", "HISTFILESIZE=0")) or
(process.args : "unset" and process.args : "HISTFILE") or
(process.args : "set" and process.args : "history" and process.args : "+o")
) and not (
process.executable like (
"/usr/bin/timeout", "/usr/bin/kubectl", "/usr/bin/psql", "/usr/lib/postgresql/*/bin/psql", "/usr/bin/bazel", "/usr/bin/git", "/usr/bin/jq", "/bin/grep"
) or
process.command_line == "stat -c %s history"
) Field Validations
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