Dropping Of Password Filter DLL — Sigma Rule

Rule metadata and linked tags

Author: Sreeman. Source status: test; severity: medium. Source dates: 2020-10-29 / 2022-10-09.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 20a8a989e285fabfd34e4847c71da43c46a9e8b8733763ef9c668720ae41c4f1

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: Dropping Of Password Filter DLL
id: b7966f4a-b333-455b-8370-8ca53c229762
status: test
description: Detects dropping of dll files in system32 that may be used to retrieve user credentials from LSASS
references:
    - https://pentestlab.blog/2020/02/10/credential-access-password-filter-dll/
    - https://github.com/3gstudent/PasswordFilter/tree/master/PasswordFilter
author: Sreeman
date: 2020-10-29
modified: 2022-10-09
tags:
    - attack.persistence
    - attack.credential-access
    - attack.defense-impairment
    - attack.t1556.002
logsource:
    category: process_creation
    product: windows
detection:
    selection_cmdline:
        CommandLine|contains|all:
            - 'HKLM\SYSTEM\CurrentControlSet\Control\Lsa'
            - 'scecli\0*'
            - 'reg add'
    condition: selection_cmdline
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://pentestlab.blog/2020/02/10/credential-access-password-filter-dll/
• https://github.com/3gstudent/PasswordFilter/tree/master/PasswordFilter