sigmamediumHunting

Greedy File Deletion Using Del

Detects execution of the "del" builtin command to remove files using greedy/wildcard expression. This is often used by malware to delete content of folders that perhaps contains the initial malware infection or to delete evidence.

MITRE ATT&CK

T1070.004

defense-evasion

Detection Query

selection_img:
  - Image|endswith: \cmd.exe
  - OriginalFileName: Cmd.Exe
selection_del:
  CommandLine|contains:
    - "del "
    - "erase "
selection_extensions:
  CommandLine|contains:
    - \\\*.au3
    - \\\*.dll
    - \\\*.exe
    - \\\*.js
condition: all of selection_*

Author

frack113 , X__Junior (Nextron Systems)

Created

2021-12-02

Data Sources

windowsProcess Creation Events

Platforms

windows

References

Tags

attack.defense-evasionattack.t1070.004

Raw Content

title: Greedy File Deletion Using Del
id: 204b17ae-4007-471b-917b-b917b315c5db
status: test
description: Detects execution of the "del" builtin command to remove files using greedy/wildcard expression. This is often used by malware to delete content of folders that perhaps contains the initial malware infection or to delete evidence.
references:
    - https://www.joesandbox.com/analysis/509330/0/html#1044F3BDBE3BB6F734E357235F4D5898582D
    - https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/erase
author: frack113 , X__Junior (Nextron Systems)
date: 2021-12-02
modified: 2023-09-11
tags:
    - attack.defense-evasion
    - attack.t1070.004
logsource:
    category: process_creation
    product: windows
detection:
    # Example:
    #   del C:\ProgramData\*.dll & exit
    selection_img:
        - Image|endswith: '\cmd.exe'
        - OriginalFileName: 'Cmd.Exe'
    selection_del:
        CommandLine|contains:
            - 'del '
            - 'erase '
    selection_extensions:
        CommandLine|contains:
            - '\\\*.au3'
            - '\\\*.dll'
            - '\\\*.exe'
            - '\\\*.js'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium