""ET TROJAN W32/Briba CnC POST Beacon""

SID: 2016911

Revision: 3

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2013_05_22, deployment Perimeter, signature_severity Major, tag c2, updated_at 2013_05_22, 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: "POST"

  • Value: "/index" Depth: 6

  • Value: ".asp"

  • Value: " MSIE "

  • Value: "Host|3A| update.microsoft.com"

  • Value: "Content-Length|3a| 00"

Within: 4

PCRE:

Special Options:

  • http_method

  • http_uri

  • http_uri

  • http_header

  • http_header

  • http_header

source