""ET TROJAN TrueBot/Silence.Downloader CnC Checkin 4""

SID: 2045299

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 2023_05_02, deployment Perimeter, deployment SSLDecrypt, malware_family TrueBot, performance_impact Low, confidence High, signature_severity Major, updated_at 2023_05_08, reviewed_at 2023_08_21

Reference:

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

  • Value: "POST"

  • Value: ".php"

  • Value: "User-Agent|3a 20|Mozilla/112.0"

  • Value: !"Referer|3a 20|"

  • Value: !"Accept"

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:

  • http_method

  • http_uri

  • http_header

  • http_header

  • http_header

source