Detection rules › Sigma

Remote Access Tool - ScreenConnect Server Web Shell Execution

Severity
high
Author
Jason Rathbun (Blackpoint Cyber)
Source
upstream

Detects potential web shell execution from the ScreenConnect server process.

MITRE ATT&CK coverage

TacticTechniques
Initial AccessT1190 Exploit Public-Facing Application

Event coverage

ProviderEvent IDTitle
Sysmon1Process creation
Security-Auditing4688A new process has been created.

Stages and Predicates

Stage 1: selection

or:
Image|endswith: '\cmd.exe'
Image|endswith: '\csc.exe'
ParentImage|endswith: '\ScreenConnect.Service.exe'

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.

FieldKindValues
Imageends_with
  • \cmd.exe corpus 92 (sigma 92)
  • \csc.exe corpus 5 (sigma 5)
ParentImageends_with
  • \ScreenConnect.Service.exe