""ET MALWARE Nerbian RAT Data Exfiltration""

SID: 2036427

Revision: 3

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2022_04_29, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, signature_severity Major, updated_at 2023_04_06, reviewed_at 2023_08_21

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: "/pub/health_check.php"

  • Value: "name=|22|addr_post|22|"

  • Value: "name=|22|port_post|22|"

  • Value: "name=|22|auth_post|22|"

  • Value: "name=|22|session_key|22|"

  • Value: "name=|22|data_post|22|"

  • Value: "Content-Type|3a 20|multipart/form-data|3b 20|boundary="

  • Value: !"Referer|3a 20|"

Within:

PCRE: "/Content-Type/x3a/x20multipart\/form-data/x3b/x20boundary=[a-f0-9]{60}/Hmi"

Special Options:

  • http_method

  • http_uri

  • fast_pattern

  • http_client_body

  • http_client_body

  • http_client_body

  • http_client_body

  • http_client_body

  • http_header

  • http_header

source