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

SID: 2031275

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: "Content-Type|3a 20|text/json|0d 0a|"

  • Value: "Server|3a 20|Microsoft-IIS/10.0|0d 0a|"

  • Value: "X-Powered-By|3a 20|ASP.NET|0d 0a|"

  • Value: "Cache-Control|3a 20|no-cache, no-store, max-age=0, must-revalidate|0d 0a|"

  • Value: "Pragma|3a 20|no-cache|0d 0a|"

  • Value: "X-Frame-Options|3a 20|SAMEORIGIN|0d 0a|"

  • Value: "Connection|3a 20|close|0d 0a|"

  • Value: "{|22|meta|22|:{},|22|status|22 3a 22|OK|22|,|22|saved|22 3a 22|1|22|,|22|starttime|22 3a|17656184060,|22|id|22 3a 22 22|,|22|vims|22 3a|{|22|dtc|22 3a|"

Within:

PCRE:

Special Options:

  • http_header

  • http_header

  • http_header

  • http_header

  • http_header

  • http_header

  • http_header

  • fast_pattern

source