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

SID: 2031277

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: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,from_client

Contents:

  • Value: "Accept|3a 20|/"

  • Value: "Accept-Language|3a 20|en-US"

  • Value: "Accept-Encoding|3a 20|gzip, deflate"

  • Value: "SIDCC=AN0-TYutOSq-fxZK6e4kagm70VyKACiG1susXcYRuxK08Y-rHysliq0LWklTqjtulAhQOPH8uA" Depth: 80

  • Value: "Cookie|3a 20|SIDCC=AN0-TYutOSq-fxZK6e4kagm70VyKACiG1susXcYRuxK08Y-rHysliq0LWklTqjtulAhQOPH8uA"

Within:

PCRE: "/\/api\/v1\/user\/(?:512|124)\/avatar/U"

Special Options:

  • http_header

  • http_header

  • http_header

  • http_cookie

  • fast_pattern

source