""ET TROJAN Cobalt Strike Malleable C2 (Unknown Profile)""

SID: 2032957

Revision: 2

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_05_13, deployment Perimeter, deployment SSLDecrypt, malware_family Cobalt_Strike, signature_severity Major, updated_at 2021_05_13, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation

Reference:

• md5

• bf8061539abbe6664924e37489a3751c

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: "/remove" Depth: 7

• Value: "User-Agent|3a 20|Mozilla/5.0 (Linux|3b 20|Android 7.0|3b 20|Pixel C Build/NRD90M|3b 20|wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0|0d 0a|"

• Value: "wordpress_logged_in=" Depth: 20

• Value: "Accept-Language|3a 20|en-GB|3b|q=0.9,|20|*|3b|q=0.7|0d 0a|"

Within:

PCRE: "/^wordpress_logged_in=(?:[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

• http_uri

• fast_pattern

• http_header

• http_cookie

• http_header

source