""ET WEB_SERVER Tunna Variant Webshell Activity""

SID: 2049010

Revision: 2

Class Type: trojan-activity

Metadata: attack_target Server, created_at 2023_11_01, deployment Perimeter, confidence High, signature_severity Major, tag WebShell, updated_at 2023_11_03, reviewed_at 2023_11_01, mitre_tactic_id TA0003, mitre_tactic_name Persistence, mitre_technique_id T1505, mitre_technique_name Server_Software_Component

Reference:

• Link

Protocol: tcp

Source Network: $HOME_NET

Source Port: $HTTP_PORTS

Destination Network: $EXTERNAL_NET

Destination Port: any

Flow: established,to_client

Contents:

• Value: "Tunna v1.1g" Depth: 11

Within:

PCRE:

Special Options:

• file_data

• fast_pattern

source