""ET TROJAN Possible LINE RUNNER Backdoor Connection Attempt""

SID: 2052270

Revision: 1

Class Type: trojan-activity

Metadata: affected_product Cisco_ASA, attack_target Networking_Equipment, tls_state TLSDecrypt, created_at 2024_04_25, deployment Perimeter, deployment SSLDecrypt, malware_family LINE_RUNNER, performance_impact Low, confidence Medium, signature_severity Major, updated_at 2024_04_25

Reference:

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: any

Destination Network: $HOME_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

  • Value: "GET"

  • Value: "/+CSCOE+/portal.css?" Depth: 20

  • Value: "|3d|"

  • Value: "|26|"

  • Value: "|3d|"

  • Value: !"Referer|3a 20|"

Within:

PCRE:

Special Options:

  • http_method

  • fast_pattern

  • http_uri

  • http_uri

  • http_uri

  • http_uri

  • http_header

source