""ET TROJAN Win32/Bisonal CnC Checkin""
SID: 2025922
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 2018_07_31, deployment Perimeter, malware_family Bisonal, performance_impact Low, signature_severity Major, updated_at 2020_05_07
Reference:
Protocol: tcp
Source Network: $HOME_NET
Source Port: any
Destination Network: $EXTERNAL_NET
Destination Port: $HTTP_PORTS
Flow: established,to_server
Contents:
-
Value: ".txt"
-
Value: "User-Agent|3a 20|Mozilla/4.0 (compatible|3b 20|MSIE 6.0|3b 20|Windows NT 5.0|3b 20|.NET CLR 1.1.4322|0d 0a|Host|3a 20|" Depth: 88
Within:
PCRE: "/^\/[a-z]{4}(?:\d{1,3}.){3}\d{1,3}[a-z]{6}.txt/U"
Special Options:
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http_uri
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http_header