Use Icacls to Hide File to Everyone

Severity: medium
Author: frack113
Source: upstream

Detect use of icacls to deny access for everyone in Users folder sometimes used to hide malicious files

MITRE ATT&CK coverage

Tactic	Techniques
Defense Evasion	`T1564.001` Hide Artifacts: Hidden Files and Directories

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation

Stages and Predicates

Stage 1: `all of selection_icacls`

or:
Image|endswith: '\icacls.exe'
OriginalFileName: iCACLS.EXE

Stage 2: `all of selection_cmd`

CommandLine|contains: '*S-1-1-0:'
CommandLine|contains: '/deny'

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-1-1-0:` `/deny`
`Image`	ends_with	`\icacls.exe`
`OriginalFileName`	eq	`iCACLS.EXE`