Directory Removal Via Rmdir — Sigma Rule

Rule metadata and linked tags

Author: frack113. Source status: test; severity: low. Source dates: 2022-01-15 / 2023-03-07.

{
  "category": "process_creation",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: a91eac3946cc46ce606285319307ff3bdc3ae5288e77e042d561580928a75f6b

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Directory Removal Via Rmdir
id: 41ca393d-538c-408a-ac27-cf1e038be80c
status: test
description: |
    Detects execution of the builtin "rmdir" command in order to delete directories.
    Adversaries may delete files left behind by the actions of their intrusion activity.
    Malware, tools, or other non-native files dropped or created on a system by an adversary may leave traces to indicate to what was done within a network and how.
    Removal of these files can occur during an intrusion, or as part of a post-intrusion process to minimize the adversary's footprint.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1070.004/T1070.004.md
    - https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/erase
author: frack113
date: 2022-01-15
modified: 2023-03-07
tags:
    - attack.stealth
    - attack.t1070.004
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\cmd.exe'
        - OriginalFileName: 'Cmd.Exe'
    selection_rmdir:
        CommandLine|contains: 'rmdir'
    selection_flags:
        CommandLine|contains:
            - '/s'
            - '/q'
    condition: all of selection_*
falsepositives:
    - Unknown
level: low
regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_cmd_rmdir_execution/info.yml

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1070.004/T1070.004.md
• https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/erase