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Detection rules › Sigma

Sensitive File Access Via Volume Shadow Copy Backup

Severity
high
Author
Max Altgelt (Nextron Systems), Tobias Michalski (Nextron Systems)
Source
upstream

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

ProviderEvent IDTitle
Sysmon1Process creation
Security-Auditing4688A new process has been created.

Stages and Predicates

Stage 1: all of selection_1

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

Stage 2: all of selection_2

or:
CommandLine|contains: '\\NTDS.dit'
CommandLine|contains: '\\SECURITY'
CommandLine|contains: '\\SYSTEM'

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)

Neighbors

Stricter alternatives (narrower than this rule)

The rules below may be useful if you find the current rule is too noisy / lacks specificity.