""ET TROJAN Possible Emissary External IP Lookup""

SID: 2023470

Revision: 1

Class Type: policy-violation

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_10_31, malware_family Emissary, malware_family Lotus_Blossom, signature_severity Major, updated_at 2016_10_31

Reference:

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: "/index.shtml"

  • Value: !"Accept"

  • Value: !"Referer|3a|"

  • Value: "User-Agent|3a 20|Mozilla/4.0 (compatible|3b| MSIE 6.0|3b| Win32)|0d 0a|"

  • Value: "Host|3a 20|"

  • Value: "b4secure.com|0d 0a|"

Within:

PCRE: "/^Host\x3a[^\r\n]+(?:www.)?b4secure.com\r$/Hmi"

Special Options:

  • http_method

  • http_uri

  • http_header

  • http_header

  • http_header

  • http_header

  • http_header

  • fast_pattern

source