Hidden Executable In NTFS Alternate Data Stream

Severity: medium
Author: Florian Roth (Nextron Systems), @0xrawsec
Source: upstream

Detects the creation of an ADS (Alternate Data Stream) that contains an executable by looking at a non-empty Imphash

MITRE ATT&CK coverage

Tactic	Techniques
Defense Evasion	`T1564.004` Hide Artifacts: NTFS File Attributes

Event coverage

Provider	Event ID	Title
Sysmon	15	FileCreateStreamHash

Stages and Predicates

Stage 1: `selection`

Hash|contains: 'IMPHASH='

Stage 2: `not 1 of filter_main_null`

Hash|contains: 'IMPHASH=00000000000000000000000000000000'

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
`Hash`	match	`IMPHASH=` `IMPHASH=00000000000000000000000000000000`