detection.wiki

Detection rules › Sigma

Sensitive File Access Via Volume Shadow Copy Backup

Status
test
Severity
high
Log source
product windows, category process_creation
Author
Max Altgelt (Nextron Systems), Tobias Michalski (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects a command that accesses the VolumeShadowCopy in order to extract sensitive files such as the Security or SAM registry hives or the AD database (ntds.dit)

MITRE ATT&CK coverage

TacticTechniques
ImpactT1490 Inhibit System Recovery

Event coverage

ProviderEventTitle
SysmonEvent ID 1Process creation
Security-AuditingEvent ID 4688A new process has been created.

Rule body yaml

title: Sensitive File Access Via Volume Shadow Copy Backup
id: f57f8d16-1f39-4dcb-a604-6c73d9b54b3d
status: test
description: |
    Detects a command that accesses the VolumeShadowCopy in order to extract sensitive files such as the Security or SAM registry hives or the AD database (ntds.dit)
references:
    - https://twitter.com/vxunderground/status/1423336151860002816?s=20
    - https://www.virustotal.com/gui/file/03e9b8c2e86d6db450e5eceec057d7e369ee2389b9daecaf06331a95410aa5f8/detection
    - https://pentestlab.blog/2018/07/04/dumping-domain-password-hashes/
author: Max Altgelt (Nextron Systems), Tobias Michalski (Nextron Systems)
date: 2021-08-09
modified: 2024-01-18
tags:
    - attack.impact
    - attack.t1490
logsource:
    category: process_creation
    product: windows
detection:
    selection_1:
        # copy \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy1\Windows\NTDS\NTDS.dit C:\temp\ntds.dit 2>&1
        # There is an additional "\" to escape the special "?"
        CommandLine|contains: '\\\\\?\\GLOBALROOT\\Device\\HarddiskVolumeShadowCopy'
    selection_2:
        CommandLine|contains:
            - '\\NTDS.dit'
            - '\\SYSTEM'
            - '\\SECURITY'
    condition: all of selection_*
falsepositives:
    - Unlikely
level: high

Stages and Predicates

Stage 0: condition

all of selection_*

Stage 1: selection_1

selection_1:
    CommandLine|contains: '\\\\\?\\GLOBALROOT\\Device\\HarddiskVolumeShadowCopy'

Stage 2: selection_2

selection_2:
    CommandLine|contains:
        - '\\NTDS.dit'
        - '\\SYSTEM'
        - '\\SECURITY'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
CommandLinematch
  • \\NTDS.dit
  • \\SECURITY
  • \\SYSTEM
  • \\\\\?\\GLOBALROOT\\Device\\HarddiskVolumeShadowCopy corpus 2 (sigma 2)