Shadow Copies Creation Using Operating Systems Utilities

Severity: medium
Author: Teymur Kheirkhabarov, Daniil Yugoslavskiy, oscd.community
Source: upstream

Shadow Copies creation using operating systems utilities, possible credential access

MITRE ATT&CK coverage

Tactic	Techniques
Credential Access	`T1003` OS Credential Dumping, `T1003.002` OS Credential Dumping: Security Account Manager, `T1003.003` OS Credential Dumping: NTDS

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation

Stages and Predicates

Stage 1: `all of selection_img`

or:
Image|endswith: '\powershell.exe'
Image|endswith: '\pwsh.exe'
Image|endswith: '\vssadmin.exe'
Image|endswith: '\wmic.exe'
OriginalFileName: PowerShell.EXE
OriginalFileName: VSSADMIN.EXE
OriginalFileName: pwsh.dll
OriginalFileName: wmic.exe

Stage 2: `all of selection_cli`

CommandLine|contains: create
CommandLine|contains: shadow

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.

Field	Kind	Values
`CommandLine`	match	`create` corpus 8 (sigma 8) `shadow` corpus 2 (sigma 2)
`Image`	ends_with	`\powershell.exe` corpus 143 (sigma 143) `\pwsh.exe` corpus 140 (sigma 140) `\vssadmin.exe` corpus 5 (sigma 5) `\wmic.exe` corpus 37 (sigma 37)
`OriginalFileName`	eq	`PowerShell.EXE` corpus 64 (sigma 60, splunk 4) `VSSADMIN.EXE` corpus 3 (sigma 3) `pwsh.dll` corpus 72 (sigma 68, splunk 4) `wmic.exe` corpus 33 (sigma 33)