""ET TROJAN BePush/Kilim CnC Beacon""

SID: 2021030

Revision: 3

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2015_04_30, deployment Perimeter, signature_severity Major, tag c2, updated_at 2017_02_14, 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: "GET"

  • Value: ".php?type="

  • Value: !"Accept-"

  • Value: !"Referer|3a|"

  • Value: !"Mozilla|2f|"

  • Value: !"threatseeker.com|0d 0a|"

Within:

PCRE: "/.php\?type=(?:update_hash|js|key|arsiv_(?:hash|link))$/U"

Special Options:

  • http_method

  • http_uri

  • http_header

  • http_header

  • http_header

source