""ET CURRENT_EVENTS [Fireeye] Backdoor.HTTP.BEACON.[Yelp GET]""
SID: 2031280
Revision: 3
Class Type: trojan-activity
Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_12_08, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_12_09, 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: "request_origin=user"
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Value: "|0d 0a|Sec-Fetch-Dest|3a 20|empty|0d 0a|"
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Value: "GET|20|" Depth: 4
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Value: "&parent_request_id="
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Value: "|20|HTTP/1"
Within: 1024
PCRE: "/^GET [^\r\n]{0,256}&parent_request_id=(?:[A-Za-z0-9_\/+-%]{128,1024})={0,2}[^\r\n]{0,256} HTTP\/1.[01]/"
Special Options:
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http_header
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fast_pattern