""ET TROJAN Win32/Backdoor.YesMaster CnC Checkin""

SID: 2025157

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 2017_12_20, deployment Perimeter, malware_family YesMaster, performance_impact Moderate, signature_severity Major, updated_at 2017_12_20

Reference:

  • md5

  • 4941501aca63cb8bdc86dadeffc9c29c

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: "x-user-agent|3a 20|YesMaster|0d 0a|"

  • Value: "x-whoami:"

  • Value: "x-pwd:"

  • Value: "x-hostname:"

  • Value: "x-isadm"

  • Value: "x-is64Env:"

  • Value: !"User-Agent:"

Within:

PCRE:

Special Options:

  • http_method

  • http_header

  • fast_pattern

  • http_header

  • http_header

  • http_header

  • http_header

  • http_header

  • http_header

source