""ET TROJAN ModPipe CnC Activity (POST)""

SID: 2031208

Revision: 2

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2020_11_16, deployment Perimeter, performance_impact Low, signature_severity Major, updated_at 2020_11_16

Reference:

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

  • Value: "User-Agent|3a 20|Mozilla/4.0|20|(compatible|3b 20|MSIE 8.0|3b 20|Windows|20|NT|20|6.1|3b 20|Trident/4.0)|0d 0a|"

  • Value: "POST /robots.txt HTTP/1."

Within:

PCRE: "/^Accept[^\r\n]+\r\nContent-Length[^\r\n]+\r\nContent-Type[^\r\n]+\r\nUser-Agent[^\r\n]+\r\nHost[^\r\n]+\r\nCache-Control[^\r\n]+\r\n(?:\r\n)?$/H"

Special Options:

  • http_header

  • fast_pattern

source