""ET TROJAN JS/Ostap CnC Activity""

SID: 2030601

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 2020_07_28, deployment Perimeter, malware_family Ostap, signature_severity Major, updated_at 2020_07_28

Reference:

  • md5

  • f5cf9ca73dd30caf43d75dd19240a79e

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: ".php?as="

  • Value: "&kl="

  • Value: "&ed="

  • Value: "@@"

  • Value: "@@"

  • Value: "@@*"

  • Value: !"Referer|3a|"

Within:

PCRE:

Special Options:

  • http_method

  • http_uri

  • http_uri

  • http_uri

  • http_uri

  • http_uri

  • http_uri

  • fast_pattern

  • http_header

source