""ET CURRENT_EVENTS [Fireeye] Backdoor.HTTP.BEACON.[CSBundle Original Stager 2]""

SID: 2031286

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: "Content-Type|3a 20|image/gif"

  • Value: "|01 00 01 00 00 02 01 44 00 3b|"

  • Value: "|ff ff ff 21 f9 04 01 00 00 00 2c 00 00 00 00|"

  • Value: "|47 49 46 38 39 61 01 00 01 00 80 00 00 00 00|"

Within:

PCRE:

Special Options:

  • http_header

  • http_header

  • http_header

  • http_header

  • http_header

  • http_header

  • http_header

  • http_header

  • file_data

  • fast_pattern

source