""ET TROJAN SPEAR CnC Beacon""

SID: 2021118

Revision: 2

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2015_05_20, deployment Perimeter, performance_impact Moderate, signature_severity Major, tag c2, updated_at 2024_04_22, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel

Reference:

• md5

• a69ac85c7e723ae37377516d7054fa0b

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: ".asp?"

• Value: " MSIE "

• Value: !"Accept"

• Value: !"Referer|3a|"

Within:

PCRE: "/.asp\?(?:[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

• http_header

source