""ET TROJAN CozyDuke APT HTTP GET CnC Beacon""

SID: 2020963

Revision: 2

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2015_04_22, deployment Perimeter, performance_impact Significant, signature_severity Major, tag c2, updated_at 2024_04_29, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel

Reference:

• md5

• 98a6484533fa12a9ba6b1bd9df1899dc

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?"

• Value: !"Accept"

• Value: !"Referer|3a|"

• Value: "User-Agent|3a 20|" Depth: 12

Within:

PCRE: "/[A-Z]{100}(?:&\w+=[a-zA-Z0-9/+=]+){0,2}$/U"

Special Options:

• http_method

• http_uri

• http_header

• http_header

• http_header

source