""ET TROJAN SPEAR CnC Beacon 2""

SID: 2021119

Revision: 2

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2015_05_20, deployment Perimeter, signature_severity Major, tag c2, updated_at 2015_05_20, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel

Reference:

• md5

• 1beb162fc327101c01b07240a924202f

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: to_server,established

Contents:

• Value: "GET"

• Value: "?wd="

• Value: !"Accept"

• Value: !"Referer|3a|"

Within:

PCRE: "/\?wd=(?:[A-Za-z0-9_-]{4})*(?:[A-Za-z0-9_-]{2}==|[A-Za-z0-9_-]{3}=|[A-Za-z0-9_-]{4})$/U"

Special Options:

• http_method

• http_uri

• http_header

• http_header

source