Sysmon Driver Unloaded Via Fltmc.EXE

Severity: high
Author: Kirill Kiryanov, oscd.community
Source: upstream

Detects possible Sysmon filter driver unloaded via fltmc.exe

MITRE ATT&CK coverage

Tactic	Techniques
Defense Evasion	`T1070` Indicator Removal, `T1562` Impair Defenses, `T1562.002` Impair Defenses: Disable Windows Event Logging

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation

Stages and Predicates

Stage 1: `all of selection_img`

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

Stage 2: `all of selection_cli`

CommandLine|contains: sysmon
CommandLine|contains: unload

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	`sysmon` corpus 2 (sigma 2) `unload` corpus 2 (sigma 2)
`Image`	ends_with	`\fltMC.exe` corpus 2 (sigma 2)
`OriginalFileName`	eq	`fltMC.exe` corpus 2 (sigma 2)