Potential SysInternals ProcDump Evasion

Hunt Hypothesis

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

Detection Rule

Sigma (Original)

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

KQL (Azure Sentinel)

imProcessCreate
| where (TargetProcessCommandLine contains "copy procdump" or TargetProcessCommandLine contains "move procdump") or ((TargetProcessCommandLine contains "copy " and TargetProcessCommandLine contains ".dmp ") and (TargetProcessCommandLine contains "2.dmp" or TargetProcessCommandLine contains "lsass" or TargetProcessCommandLine contains "out.dmp")) or (TargetProcessCommandLine contains "copy lsass.exe_" or TargetProcessCommandLine contains "move lsass.exe_")

Required Data Sources

False Positive Guidance

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

MITRE ATT&CK Context

• Tactic: Credential Access
• Technique: T1036 — T1036
• Technique: T1003.001 — T1003.001

References

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