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

SID: 2031284

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,to_server

Contents:

  • Value: "ses-"

  • Value: "POST"

  • Value: "Accept|3a 20|/|0d 0a|"

  • Value: "Accept-Language|3a 20|en-US|0d 0a|"

  • Value: "Accept-Encoding|3a 20|gzip, deflate|0d 0a|"

  • Value: "{|22|locale|22 3a 22|en|22|,|22|channel|22 3a 22|prod|22|,|22|addon|22 3a 22|"

Within:

PCRE: "/^POST\s(?:\/v4\/links\/check-activity\/check|\/v1\/stats|\/gql|\/api2\/json\/check\/ticket|\/1.5\/95648064\/storage\/history|\/1.5\/95648064\/storage\/tabs|\/u\/0\/_\/og\/botguard\/get|\/ev\/prd001001|\/ev\/ext001001|\/gp\/aw\/ybh\/handlers|\/v3\/links\/ping-beat\/check)/"

Special Options:

  • http_method

  • http_header

  • http_header

  • http_header

  • fast_pattern

source