""ET TROJAN Matryoshka CnC Beacon 1""
SID: 2022146
Revision: 1
Class Type: trojan-activity
Metadata: attack_target Client_Endpoint, created_at 2015_11_25, deployment Perimeter, signature_severity Major, tag c2, updated_at 2015_11_25, 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: $HTTP_PORTS
Flow: established,to_server
Contents:
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Value: "GET"
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Value: "/img/" Depth: 5
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Value: "/"
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Value: "/general.png"
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Value: !"Referer|3a|"
Within: 1
PCRE: "/^\/img\/[a-f0-9]{32}\/[a-f0-9]+\/general.png$/U"
Special Options:
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http_method
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http_uri
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http_uri
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http_uri
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http_header