""ET TROJAN Cobalt Strike Activity (GET)""
SID: 2034402
Revision: 3
Class Type: trojan-activity
Metadata: attack_target Client_Endpoint, created_at 2021_11_10, deployment Perimeter, deployment SSLDecrypt, malware_family Cobalt_Strike, performance_impact Significant, signature_severity Major, tag c2, updated_at 2024_04_04, 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: "/rpc"
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Value: "Accept-Language|3a 20|en-GB|3b|q=0.9,|20|*|3b|q=0.7|0d 0a|"
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Value: !"Referer|3a 20|"
Within:
PCRE: "/\x3a\x20[^\r\n]+\r\nHost\x3a\x20[^\r\n]+\r\nAccept-Encoding\x3a\x20[^\r\n]+\r\nAccept-Language\x3a\x20[^\r\n]+\r\nUser-Agent\x3a\x20[^\r\n]+\r\n/"
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
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http_header