""ET TROJAN Possible Outbound WebShell GIF""

SID: 2027738

Revision: 2

Class Type: trojan-activity

Metadata: attack_target Web_Server, created_at 2019_07_22, deployment Perimeter, performance_impact Low, signature_severity Major, tag WebShell, updated_at 2019_07_22

Reference:

Protocol: tcp

Source Network: $HTTP_SERVERS

Source Port: $HTTP_PORTS

Destination Network: $EXTERNAL_NET

Destination Port: any

Flow: established,from_server

Contents:

  • Value: "200"

  • Value: "GIF89a" Depth: 6

  • Value: "<%eval|20|request|28 22|"

Within:

PCRE:

Special Options:

  • http_stat_code

  • file_data

  • fast_pattern

source