""ET TROJAN Win32/Ketrican CnC Activity""

SID: 2027728

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_07_18, deployment Perimeter, deployment SSLDecrypt, signature_severity Major, tag Ketrican, updated_at 2019_07_18

Reference:

  • md5

  • 03a2f5ea0cea83e77770a4018c4469ab

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: to_server,established

Contents:

  • Value: "POST"

  • Value: ".aspx?a1="

  • Value: "Content-Length|3a 20|88|0d 0a|"

  • Value: "AA" Depth: 2

Within:

PCRE: "/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/P"

Special Options:

  • http_method

  • http_uri

  • fast_pattern

  • http_header

  • http_client_body

source