""ET TROJAN CROSSWALK CnC Checkin""

SID: 2029570

Revision: 2

Class Type: trojan-activity

Metadata: created_at 2020_03_04, deployment Perimeter, malware_family CROSSWALK, performance_impact Low, signature_severity Major, updated_at 2020_03_04

Reference:

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

  • Value: "POST"

  • Value: "/QUERY/"

  • Value: "dCy|3a 20|" Depth: 5

  • Value: !"User-Agent|3a 20|"

Within:

PCRE: "/^dCy\x3a\x20(?:[A-Z0-9+/]{4})*(?:[A-Z0-9+/]{2}==|[A-Z0-9+/]{3}=|[A-Z0-9+/]{4})\d(?:\r\n)?$/Hmi"

Special Options:

  • http_method

  • http_uri

  • http_header

  • fast_pattern

  • http_header

source