""ET TROJAN APT32 Win32/Ratsnif CnC Checkin""

SID: 2027659

Revision: 2

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, created_at 2019_07_02, deployment Perimeter, malware_family Ratsnif, performance_impact Low, signature_severity Major, tag APT32, updated_at 2019_07_02

Reference:

  • md5

  • 516ad28f8fa161f086be7ca122351edf

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: "/cl_client_online.php"

  • Value: "Q29tcHV0ZXJOYW1lPV" Depth: 18

Within:

PCRE: "/^(?:[A-Z0-9+/]{4})*(?:[A-Z0-9+/]{2}==|[A-Z0-9+/]{3}=|[A-Z0-9+/]{4})$/Pi"

Special Options:

  • http_method

  • http_uri

  • http_client_body

  • fast_pattern

source