""ET TROJAN Cobalt Strike Beacon Activity (GET)""
SID: 2033927
Revision: 2
Class Type: trojan-activity
Metadata: attack_target Client_Endpoint, created_at 2021_09_13, deployment Perimeter, deployment SSLDecrypt, malware_family Cobalt_Strike, signature_severity Major, updated_at 2021_09_13, 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: $HTTP_PORTS
Flow: established,to_server
Contents:
-
Value: "GET"
-
Value: "/topstories"
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Value: "User-Agent|3a 20|Mozilla/5.0|20 28|Windows NT 6.1|29 20|Gecko/14.0|20|Firefox/14.0"
Within:
PCRE: "/^__cfduid=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/C"
Special Options:
-
http_method
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http_uri
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fast_pattern
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http_header