""ET TROJAN AHK/BKDR_HTV.ZKGD-A Fake HTTP 500 Containing Encoded Commands Inbound""

SID: 2027156

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 2019_04_04, deployment Perimeter, malware_family BKDR_HTV_ZKGD_A, performance_impact Low, signature_severity Major, updated_at 2019_04_04

Reference:

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: $HTTP_PORTS

Destination Network: $HOME_NET

Destination Port: any

Flow: established,from_server

Contents:

  • Value: "charset=UTF-8"

  • Value: "500"

  • Value: "500|20|Internal|20|Server|20|Error|3c 21 2d 2d|"

Within:

PCRE: "/^[A-F0-9]+\x2d\x2d\x3e(?:\r\n)?$/R"

Special Options:

  • http_header

  • http_stat_code

  • file_data

source