Suspicious Registry Modification From ADS Via Regini.EXE

Severity: high
Author: Eli Salem, Sander Wiebing, oscd.community
Source: upstream

Detects the import of an alternate data stream with regini.exe, regini.exe can be used to modify registry keys.

MITRE ATT&CK coverage

Tactic	Techniques
Persistence	`T1112` Modify Registry
Defense Evasion	`T1112` Modify Registry

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation

Stages and Predicates

Stage 1: `all of selection_img`

or:
Image|endswith: '\regini.exe'
OriginalFileName: REGINI.EXE

Stage 2: `all of selection_re`

CommandLine|re: ':[^ \\]'

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`	regex_match	`:[^ \\]` corpus 4 (sigma 4)
`Image`	ends_with	`\regini.exe` corpus 2 (sigma 2)
`OriginalFileName`	eq	`REGINI.EXE` corpus 2 (sigma 2)

Neighbors

Equivalent rules

1 other rule has the same matching logic as this one. Useful for cross-vendor comparison or picking the variant your stack supports. See eq_0008.