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

SID: 2036876

Revision: 1

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2022_06_06, deployment Perimeter, malware_family Cobalt_Strike, signature_severity Major, updated_at 2022_06_06, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation

Reference:

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: "/siteindex/b/?filter=" Depth: 21

  • Value: "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/587.38 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/"

  • Value: "|0d 0a|User-Agent|3a 20|Mozilla/5.0 (Windows NT 6.1) AppleWebKit/587.38 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.36|0d 0a|"

  • Value: "|0d 0a|Connection|3a 20|Close|0d 0a|"

  • Value: !"|0d 0a|Referer|3a 20|"

Within:

PCRE:

Special Options:

  • http_method

  • http_uri

  • http_header

  • http_header

  • http_header

  • http_header

source