Remote Access Tool - ScreenConnect Remote Command Execution

Severity: low
Author: Ali Alwashali
Source: upstream

Detects the execution of a system command via the ScreenConnect RMM service.

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1059.003` Command and Scripting Interpreter: Windows Command Shell

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation

Stages and Predicates

Stage 1: `all of selection_parent`

ParentImage|endswith: '\ScreenConnect.ClientService.exe'

Stage 2: `all of selection_img`

or:
Image|endswith: '\cmd.exe'
OriginalFileName: Cmd.Exe

Stage 3: `all of selection_cli`

CommandLine|contains: '\TEMP\ScreenConnect\'

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	`\TEMP\ScreenConnect\`
`Image`	ends_with	`\cmd.exe` corpus 92 (sigma 92)
`OriginalFileName`	eq	`Cmd.Exe` corpus 32 (sigma 30, splunk 2)
`ParentImage`	ends_with	`\ScreenConnect.ClientService.exe`