""ET TROJAN Cobalt Strike Beacon Activity (GET)""

SID: 2032338

Revision: 2

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2021_03_26, deployment Perimeter, deployment SSLDecrypt, signature_severity Major, tag c2, updated_at 2021_03_26, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel

Reference:

• md5

• 49ebd0be7e33c59ee584cb8601093775

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: "/Forums?listinfo=" Depth: 17

• Value: !"Referer|3a 20|"

Within:

PCRE: "/^made_write_conn=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/C"

Special Options:

• http_method

• fast_pattern

• http_uri

• http_header

source