""ET CURRENT_EVENTS [Fireeye] Backdoor.HTTP.BEACON.[CSBundle MSOffice GET]""

SID: 2031290

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:

Contents:

  • Value: "GET"

  • Value: "Accept: /"

  • Value: "Accept-Encoding: gzip, deflate, br"

  • Value: "Accept-Language: en-US|0d 0a|"

  • Value: "sess-="

  • Value: "auth=0|3b|loc=US|7d|"

Within:

PCRE: "/^(?:\/updates|\/license\/eula|\/docs\/office|\/software-activation)/U"

Special Options:

  • http_method

  • http_header

  • http_header

  • http_header

  • fast_pattern

source