""ET TROJAN TrueBot/Silence.Downloader CnC Checkin 3""

SID: 2042959

Revision: 2

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_01_17, deployment Perimeter, signature_severity Major, tag Truebot, updated_at 2022_12_19, former_sid 2834446

Reference:

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

  • Value: ".php HTTP/1.0|0d 0a|Host|3a 20|"

  • Value: "POST"

  • Value: "q=" Depth: 2

  • Value: !"Referer"

  • Value: !"Accept"

  • Value: !"User-Agent"

Within:

PCRE: "/^q=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/Pi"

Special Options:

  • fast_pattern

  • http_method

  • http_client_body

  • http_header

  • http_header

  • http_header

source