Remove Immutable File Attribute

A Sigma rule for process creation on Linux, by Nasreddine Bencherchali (Nextron Systems).

medium 1 ATT&CK technique 1 program it names 1 everyday example trips it

What it looks for

its detection, as SigmaHQ writes it

detection:
  selection:
    CommandLine|contains: ' -i '
    Image|endswith: '/chattr'
  condition: selection

The rule’s detection, its selections and fields in order of name. The whole rule, with its references and false positives, is on SigmaHQ, by Nasreddine Bencherchali (Nextron Systems), under the Detection Rule License 1.1. CmdID evaluates it on a command line alone: a test on what a command line cannot show, such as the parent process or the user, is not met.

Command lines that trip it

everyday examples from tldr-pages, CC BY 4.0, each read by CmdID

Make a file or directory mutable on the page for chattr

sudo chattr -i path/to/file_or_directoryIdentify

Programs and files it names

their pages here

chattr

ATT&CK

the techniques it is tagged with

T1222.002File and Directory Permissions Modification: Linux and Mac Permissions

Remove Immutable File Attribute

What it looks for

Command lines that trip it

Programs and files it names

ATT&CK

Other rules for T1222.002 File and Directory Permissions Modification: Linux and Mac Permissions