""ET CURRENT_EVENTS [Fireeye] Backdoor.HTTP.BEACON.[CSBundle USAToday Server]""

SID: 2031274

Revision: 3

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_12_08, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_12_09, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel

Reference:

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: $HTTP_PORTS

Destination Network: $HOME_NET

Destination Port: any

Flow: established,from_server

Contents:

  • Value: "HTTP/1." Depth: 7

  • Value: "Connection|3a 20|close"

  • Value: "Content-Type|3a 20|application/json\

  • Value: "Content-Security-Policy|3a 20|upgrade-insecure-requests"

  • Value: "Strict-Transport-Security|3a 20|max-age=10890000"

  • Value: "Cache-Control|3a 20|public, immutable, max-age=315360000"

  • Value: "Accept-Ranges|3a 20|bytes"

  • Value: "X-Cache|3a 20|HIT, HIT"

  • Value: "X-Timer|3a 20|S1593010188.776402,VS0,VE1"

  • Value: "Vary|3a 20|X-AbVariant, X-AltUrl, Accept-Encoding"

Within:

PCRE:

Special Options:

  • http_header

  • charset=utf-8"

  • http_header

  • http_header

  • http_header

  • http_header

  • http_header

  • http_header

  • http_header

  • http_header

  • fast_pattern

source