""ET TROJAN Ursnif Variant CnC Beacon - URI Struct M2 (_2F)""
SID: 2033204
Revision: 4
Class Type: trojan-activity
Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_06_29, deployment Perimeter, malware_family ursnif, performance_impact Moderate, signature_severity Major, updated_at 2023_06_12
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: "_2F"
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Value: "_2F"
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Value: "_2F"
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Value: !"&"
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Value: !"?"
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Value: !"="
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Value: !"/tr/v1/" Depth: 7
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Value: !"surveymonkey.com|0d 0a|"
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Value: !"cisco.com|0d 0a|"
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Value: "Connection|3a 20|Keep-Alive|0d 0a|"
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Value: !"Referer|3a 20|"
Within:
PCRE:
Special Options:
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http_method
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http_uri
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http_uri
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fast_pattern
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http_uri
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http_uri
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http_uri
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http_uri
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http_uri
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http_header
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http_header
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http_header
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http_header