""ET TROJAN W32/Badspace.Backdoor CnC Activity (POST)""

SID: 2052558

Revision: 2

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2024_05_13, deployment Perimeter, signature_severity Major, tag c2, updated_at 2024_08_19, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol

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: "|2f|"

• Value: "|0d 0a|User-Agent|3a 20|Mozilla|20 2f 20|"

• Value: "MSIE|20|6|2e|0|3b 20|Windows|20|NT|20|5|2e|1|3b 20|SV1|3b|"

Within:

PCRE: "/^(?:[A-Za-z0-9\x2b\x2f\x3d]){100,}$/C"

Special Options:

• http_method

• http_uri

• http_header

source