Sysmon Discovery Via Default Driver Altitude Using Findstr.EXE

Severity: high
Author: frack113
Source: upstream

Detects usage of "findstr" with the argument "385201". Which could indicate potential discovery of an installed Sysinternals Sysmon service using the default driver altitude (even if the name is changed).

MITRE ATT&CK coverage

Tactic	Techniques
Discovery	`T1518.001` Software Discovery: Security Software Discovery

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation

Stages and Predicates

Stage 1: `all of selection_img`

or:
Image|endswith: '\find.exe'
Image|endswith: '\findstr.exe'
OriginalFileName: FIND.EXE
OriginalFileName: FINDSTR.EXE

Stage 2: `all of selection_cli`

CommandLine|contains: ' 385201'

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	`385201`
`Image`	ends_with	`\find.exe` corpus 8 (sigma 8) `\findstr.exe` corpus 11 (sigma 11)
`OriginalFileName`	eq	`FIND.EXE` corpus 6 (sigma 6) `FINDSTR.EXE` corpus 10 (sigma 10)