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fix: make sure that when deleting shell history the system call is taken into account #762

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merged 1 commit into from
Aug 7, 2019
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fix: make sure that when deleting shell history the system call is taken into account #762

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28 changes: 22 additions & 6 deletions rules/falco_rules.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -2381,13 +2381,29 @@
WARNING
tags: [process, mitre_persistence]

- rule: Delete Bash History
desc: Detect bash history deletion
condition: >
((spawned_process and proc.name in (shred, rm, mv) and proc.args contains "bash_history") or
(open_write and fd.name contains "bash_history" and evt.arg.flags contains "O_TRUNC"))
- rule: Delete or rename shell history
desc: Detect shell history deletion
condition: >
(modify and (
evt.arg.name contains "bash_history" or
evt.arg.name contains "zsh_history" or
evt.arg.name contains "fish_read_history" or
evt.arg.name endswith "fish_history" or
evt.arg.oldpath contains "bash_history" or
evt.arg.oldpath contains "zsh_history" or
evt.arg.oldpath contains "fish_read_history" or
evt.arg.oldpath endswith "fish_history" or
evt.arg.path contains "bash_history" or
evt.arg.path contains "zsh_history" or
evt.arg.path contains "fish_read_history" or
evt.arg.path endswith "fish_history")) or
(open_write and (
fd.name contains "bash_history" or
fd.name contains "zsh_history" or
fd.name contains "fish_read_history" or
fd.name endswith "fish_history") and evt.arg.flags contains "O_TRUNC")
output: >
Bash history has been deleted (user=%user.name command=%proc.cmdline file=%fd.name %container.info)
Shell history had been deleted or renamed (user=%user.name type=%evt.type command=%proc.cmdline fd.name=%fd.name name=%evt.arg.name path=%evt.arg.path oldpath=%evt.arg.oldpath %container.info)
priority:
WARNING
tag: [process, mitre_defense_evation]
Expand Down