Diskshadow Script Mode - Execution From Potential Suspicious Location

Severity: medium
Author: Nasreddine Bencherchali (Nextron Systems)
Source: upstream

Detects execution of "Diskshadow.exe" in script mode using the "/s" flag where the script is located in a potentially suspicious location.

MITRE ATT&CK coverage

Tactic	Techniques
Defense Evasion	`T1218` System Binary Proxy Execution

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation

Stages and Predicates

Stage 1: `all of selection_img`

or:
Image|endswith: '\diskshadow.exe'
OriginalFileName: diskshadow.exe

Stage 2: `all of selection_cli`

CommandLine|contains: '-s '

Stage 3: `all of selection_paths`

or:
CommandLine|contains: ':\Temp\'
CommandLine|contains: ':\Windows\Temp\'
CommandLine|contains: '\AppData\Local\'
CommandLine|contains: '\AppData\Roaming\'
CommandLine|contains: '\ProgramData\'
CommandLine|contains: '\Users\Public\'

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	`-s` corpus 3 (sigma 3) `:\Temp\` corpus 14 (sigma 14) `:\Windows\Temp\` corpus 15 (sigma 15) `\AppData\Local\` corpus 8 (sigma 8) `\AppData\Roaming\` corpus 10 (sigma 10) `\ProgramData\` corpus 2 (sigma 2) `\Users\Public\` corpus 17 (sigma 17)
`Image`	ends_with	`\diskshadow.exe` corpus 3 (sigma 3)
`OriginalFileName`	eq	`diskshadow.exe` corpus 3 (sigma 3)