""ET TROJAN APT Lurker POST CnC Beacon""

SID: 2021584

Revision: 3

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2015_08_03, deployment Perimeter, signature_severity Major, tag c2, updated_at 2015_08_11, 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: 443

Flow: established,to_server

Contents:

  • Value: "POST /" Depth: 6

  • Value: ".php HTTP/1."

  • Value: !"Content-Type|3a|"

  • Value: !"Accept"

  • Value: !"Referer|3a|"

  • Value: "HOST|3a|"

Within: 5

PCRE: "/^[^\r\n]+\r\nUser-Agent\x3a[^\r\n]+\r\nContent-Length\x3a\x20\d+\r\n(?:\r\n)?$/Rmi"

Special Options:

  • fast_pattern

source