""ET TROJAN Linux/SSHDoor.A Reporting Backdoor CnC Beacon""

SID: 2016314

Revision: 1

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2013_01_30, deployment Perimeter, signature_severity Major, tag c2, updated_at 2013_01_30, 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: "port="

  • Value: "|3A|"

  • Value: "&uname="

Within:

PCRE: "/port\x3D[0-9]{1,3}\x2E[0-9]{1,3}\x2E[0-9]{1,3}\x2E[0-9]{1,3}\x3A[0-9]{1,5}/U"

Special Options:

  • http_uri

  • http_uri

  • http_uri

source