""ET TROJAN Octopus Malware CnC Server Connectivity Check""
SID: 2026543
Revision: 2
Class Type: trojan-activity
Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_10_24, deployment Perimeter, signature_severity Major, tag Octopus, updated_at 2018_10_24
Reference:
Protocol: tcp
Source Network: $HOME_NET
Source Port: any
Destination Network: $EXTERNAL_NET
Destination Port: $HTTP_PORTS
Flow: established,to_server
Contents:
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Value: "GET"
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Value: ".php?check="
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Value: "Accept|3a 20|text/html,application/xhtml+xml,application/xml|3b|q=0.9,/|3b|q=0.8|0d 0a|"
Within:
PCRE: "/^Host\x3a\x20[^\r\n]+\r\nAccept\x3a\x20[^\r\n]+\r\nAccept-Encoding\x3a\x20[^\r\n]+\r\nUser-Agent\x3a\x20[^\r\n]+\r\n$/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