Potential SysInternals ProcDump Evasion — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems). Source status: test; severity: high. Source dates: 2022-01-11 / 2023-05-09.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: f2674f4d33d78ce5f6da477d67a0be784b389074490ee82b85e50305176b0c41

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: Potential SysInternals ProcDump Evasion
id: 79b06761-465f-4f88-9ef2-150e24d3d737
status: test
description: Detects uses of the SysInternals ProcDump utility in which ProcDump or its output get renamed, or a dump file is moved or copied to a different name
references:
    - https://twitter.com/mrd0x/status/1480785527901204481
author: Florian Roth (Nextron Systems)
date: 2022-01-11
modified: 2023-05-09
tags:
    - attack.stealth
    - attack.t1036
    - attack.t1003.001
    - attack.credential-access
logsource:
    category: process_creation
    product: windows
detection:
    selection_1:
        CommandLine|contains:
            - 'copy procdump'
            - 'move procdump'
    selection_2:
        CommandLine|contains|all:
            - 'copy '
            - '.dmp '
        CommandLine|contains:
            - '2.dmp'
            - 'lsass'
            - 'out.dmp'
    selection_3:
        CommandLine|contains:
            - 'copy lsass.exe_'  # procdump default pattern e.g. lsass.exe_220111_085234.dmp
            - 'move lsass.exe_'  # procdump default pattern e.g. lsass.exe_220111_085234.dmp
    condition: 1 of selection_*
falsepositives:
    - False positives are expected in cases in which ProcDump just gets copied to a different directory without any renaming
level: high

Original YAML and metadata in JSON

False positives

• False positives are expected in cases in which ProcDump just gets copied to a different directory without any renaming

Source references

• https://twitter.com/mrd0x/status/1480785527901204481