""ET TROJAN Chthonic Check-in""
SID: 2019881
Revision: 4
Class Type: trojan-activity
Metadata: created_at 2014_12_06, performance_impact Significant, updated_at 2024_04_08
Reference:
Protocol: tcp
Source Network: $HOME_NET
Source Port: any
Destination Network: $EXTERNAL_NET
Destination Port: $HTTP_PORTS
Flow: to_server,established
Contents:
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Value: "POST"
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Value: " MSIE "
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Value: !"Content-Type"
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Value: !"Accept-"
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Value: !"Referer"
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Value: "Accept|3a 20|/|0d 0a|User-Agent|3a|" Depth: 24
Within:
PCRE: "/^Accept\x3a\x20*\/*\r\nUser-Agent\x3a\x20Mozilla\/\d+.\d+\x20\x28compatible\x3b\x20MSIE\x20\d+.\d+\x3b\x20Windows NT \d+.\d+\x3b SV1\x29\r\nHost\x3a\x20[^\r\n]+\r\nContent-Length\x3a\x20\d{3,}\r\nConnection\x3a\x20Keep-Alive\r\n(?:Cache-Control|Pragma)\x3a\x20no-cache\r\n(?:\r\n)?$/H"
Special Options:
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http_method
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http_header
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http_header
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http_header
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http_header
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http_header