""ET TROJAN Possible PowerShell Empire Activity Outbound""
SID: 2027512
Revision: 2
Class Type: trojan-activity
Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, created_at 2019_06_24, deployment Perimeter, performance_impact Low, signature_severity Major, tag PowerShell_Empire, tag T1086, updated_at 2019_06_24
Reference:
Protocol: tcp
Source Network: $HOME_NET
Source Port: any
Destination Network: $EXTERNAL_NET
Destination Port: $HTTP_PORTS
Flow: established,to_server
Contents:
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Value: "GET"
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Value: "/" Depth: 1
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Value: "session="
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Value: "User-Agent|3a 20|Mozilla|2f|5.0|20 28|Windows|20|NT|20|6.1"
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Value: !"Referer|3a|"
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Value: !"Cache"
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Value: !"Accept"
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Value: ".php|20|HTTP|2f|1.1|0d 0a|Cookie|3a 20|session="
Within:
PCRE: "/^session=(?:[A-Z0-9+/]{4})*(?:[A-Z0-9+/]{2}==|[A-Z0-9+/]{3}=|[A-Z0-9+/]{4})$/Ci"
Special Options:
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http_method
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http_uri
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http_cookie
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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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fast_pattern