""ET SCAN Observed Suspicious UA (Callstranger Vulnerability Checker)""
SID: 2030271
Revision: 2
Class Type: attempted-recon
Metadata: attack_target Client_Endpoint, created_at 2020_06_09, deployment Perimeter, signature_severity Informational, updated_at 2020_06_09
Reference:
Protocol: tcp
Source Network: $EXTERNAL_NET
Source Port: $HTTP_PORTS
Destination Network: $HOME_NET
Destination Port: any
Flow: established,to_server
Contents:
- Value: "User-Agent|3a 20|Callstranger Vulnerability Checker|0d 0a|"
Within:
PCRE:
Special Options:
- http_header