""ET TROJAN Cobalt Strike Beacon Activity""
SID: 2032274
Revision: 2
Class Type: trojan-activity
Metadata: attack_target Client_Endpoint, created_at 2021_03_22, deployment Perimeter, deployment SSLDecrypt, signature_severity Major, tag c2, updated_at 2021_03_22, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel
Reference:
Protocol: tcp
Source Network: $HOME_NET
Source Port: any
Destination Network: $EXTERNAL_NET
Destination Port: $HTTP_PORTS
Flow: established,to_server
Contents:
-
Value: "GET"
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Value: "/userid=" Depth: 8
-
Value: "Content-Transfer-Encoding|3a 20|base64|0d 0a|"
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Value: !"Referer|3a 20|"
Within:
PCRE: "/\/userid=[A-Z]{256}$/U"
Special Options:
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http_method
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fast_pattern
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http_uri
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http_header
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http_header