Uninstall Sysinternals Sysmon

Severity: high
Author: frack113
Source: upstream

Detects the removal of Sysmon, which could be a potential attempt at defense evasion

MITRE ATT&CK coverage

Tactic	Techniques
Defense Evasion	`T1562.001` Impair Defenses: Disable or Modify Tools

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation

Stages and Predicates

Stage 1: `all of selection_pe`

or:
Description: 'System activity monitor'
Image|endswith: '\Sysmon.exe'
Image|endswith: '\Sysmon64.exe'

Stage 2: `all of selection_cli`

CommandLine|contains: -u

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	`-u` corpus 3 (sigma 3)
`Description`	eq	`System activity monitor` corpus 2 (sigma 2)
`Image`	ends_with	`\Sysmon.exe` corpus 3 (sigma 3) `\Sysmon64.exe` corpus 3 (sigma 3)