""ET TROJAN TrueBot/Silence.Downloader Keep-Alive""

SID: 2026560

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 2018_10_29, deployment Perimeter, malware_family TrueBot, malware_family Silence_Downloader, performance_impact Moderate, signature_severity Major, updated_at 2018_10_29

Reference:

  • md5

  • c2a00949ddacfed9ed2ef83a8cb44780

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

  • Value: "GET"

  • Value: ".php?dns="

  • Value: !"Referer|3a|"

  • Value: !"Accept"

  • Value: !"User-Agent|3a|"

Within:

PCRE: "/^Host\x3a\x20[^\r\n]+\r\n\r\n$/Hmi"

Special Options:

  • http_method

  • http_uri

  • fast_pattern

  • http_header

  • http_header

  • http_header

source