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new(rules): Create Hardlink Over Sensitive Files

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New rule to prevent hardlink bypass and symlink rule set to WARNING for consistency
Signed-off-by: Shay Berkovich <sberkovich@blackberry.com>
Co-authored-by: Meera Balsara <mbalsara@blackberry.com>
This commit is contained in:
Shay Berkovich 2021-10-13 10:41:52 +03:00 committed by poiana
parent 996ccf555c
commit d989e9c2d5
1 changed files with 14 additions and 1 deletions
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15
rules/falco_rules.yaml
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@ -68,6 +68,9 @@
- macro: create_symlink
condition: evt.type in (symlink, symlinkat) and evt.dir=<
- macro: create_hardlink
condition: evt.type in (link, linkat) and evt.dir=<
- macro: chmod
condition: (evt.type in (chmod, fchmod, fchmodat) and evt.dir=<)
@ -2696,7 +2699,17 @@
(evt.arg.target in (sensitive_file_names) or evt.arg.target in (sensitive_directory_names))
output: >
Symlinks created over sensitive files (user=%user.name user_loginuid=%user.loginuid command=%proc.cmdline target=%evt.arg.target linkpath=%evt.arg.linkpath parent_process=%proc.pname)
priority: NOTICE
priority: WARNING
tags: [file, mitre_exfiltration]
- rule: Create Hardlink Over Sensitive Files
desc: Detect hardlink created over sensitive files
condition: >
create_hardlink and
(evt.arg.oldpath in (sensitive_file_names))
output: >
Hardlinks created over sensitive files (user=%user.name user_loginuid=%user.loginuid command=%proc.cmdline target=%evt.arg.oldpath linkpath=%evt.arg.newpath parent_process=%proc.pname)
priority: WARNING
tags: [file, mitre_exfiltration]
- list: miner_ports