""ET TROJAN PowerShell Downloader CnC Activity""

SID: 2030151

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 2020_05_11, deployment Perimeter, signature_severity Major, updated_at 2020_05_11

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: ".NET|20|"

  • Value: "E9PQ"

  • Value: !"Referer|3a 20|"

Within: 4

PCRE: "/^User-Agent\x3a\x20[^\r\n]+.NET\s[a-zA-Z0-9+\/]{2}E9PQ[^\x20]+\x3b)\r\n/Hm"

Special Options:

  • http_method

  • http_header

  • http_header

  • fast_pattern

  • http_header

source