LSASS Dump Keyword In CommandLine — Sigma Rule

Rule metadata and linked tags

Author: E.M. Anhaus, Tony Lambert, oscd.community, Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: high. Source dates: 2019-10-24 / 2023-08-29.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: c2e2e6b1875339e71fe45c72754dbe299b34bb32ec14e74647b43555f460fd83

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: LSASS Dump Keyword In CommandLine
id: ffa6861c-4461-4f59-8a41-578c39f3f23e
related:
    - id: a5a2d357-1ab8-4675-a967-ef9990a59391
      type: derived
status: test
description: |
    Detects the presence of the keywords "lsass" and ".dmp" in the commandline, which could indicate a potential attempt to dump or create a dump of the lsass process.
references:
    - https://github.com/Hackndo/lsassy
    - https://medium.com/@markmotig/some-ways-to-dump-lsass-exe-c4a75fdc49bf
    - https://github.com/elastic/detection-rules/blob/c76a39796972ecde44cb1da6df47f1b6562c9770/rules/windows/credential_access_lsass_memdump_file_created.toml
    - https://www.whiteoaksecurity.com/blog/attacks-defenses-dumping-lsass-no-mimikatz/
    - https://github.com/helpsystems/nanodump
    - https://github.com/CCob/MirrorDump
author: E.M. Anhaus, Tony Lambert, oscd.community, Nasreddine Bencherchali (Nextron Systems)
date: 2019-10-24
modified: 2023-08-29
tags:
    - attack.credential-access
    - attack.t1003.001
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        - CommandLine|contains:
              - 'lsass.dmp'
              - 'lsass.zip'
              - 'lsass.rar'
              - 'Andrew.dmp'
              - 'Coredump.dmp'
              - 'NotLSASS.zip'  # https://github.com/CCob/MirrorDump
              - 'lsass_2'  # default format of procdump v9.0 is lsass_YYMMDD_HHmmss.dmp
              - 'lsassdump'
              - 'lsassdmp'
        - CommandLine|contains|all:
              - 'lsass'
              - '.dmp'
        - CommandLine|contains|all:
              - 'SQLDmpr'
              - '.mdmp'
        - CommandLine|contains|all:
              - 'nanodump'
              - '.dmp'
    condition: selection
falsepositives:
    - Unlikely
level: high

Original YAML and metadata in JSON

False positives

• Unlikely

Source references

• https://github.com/Hackndo/lsassy
• https://medium.com/@markmotig/some-ways-to-dump-lsass-exe-c4a75fdc49bf
• https://github.com/elastic/detection-rules/blob/c76a39796972ecde44cb1da6df47f1b6562c9770/rules/windows/credential_access_lsass_memdump_file_created.toml
• https://www.whiteoaksecurity.com/blog/attacks-defenses-dumping-lsass-no-mimikatz/
• https://github.com/helpsystems/nanodump
• https://github.com/CCob/MirrorDump