""ET TROJAN Cobalt Strike Beacon Activity (UNC2447)""
SID: 2032944
Revision: 1
Class Type: trojan-activity
Metadata: attack_target Client_Endpoint, created_at 2021_05_11, deployment Perimeter, deployment SSLDecrypt, signature_severity Major, tag c2, updated_at 2021_05_11, 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:
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Value: "GET"
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Value: ".htm"
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Value: "|20 28|compatible|3b 20|"
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Value: "|3b 20|.NET4.0E|20 29 0d 0a|"
Within:
PCRE: "/^User-Agent\x3a\x20[^\r\n]+\x3b\x20.NET4.0E\x20\x29/Hmi"
Special Options:
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http_method
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http_uri
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fast_pattern
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http_header