""ET TROJAN Lazarus APT Related Valefor/VSingle CnC Beacon""
SID: 2037275
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 2020_07_09, deployment Perimeter, malware_family Lazarus, malware_family Stonefly, signature_severity Major, tag c2, updated_at 2022_07_06, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel
Reference:
Protocol: tcp
Source Network: $HOME_NET
Source Port: any
Destination Network: $EXTERNAL_NET
Destination Port: $HTTP_PORTS
Flow: to_server,established
Contents:
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Value: "GET"
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Value: "/1"
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Value: ".php?ufw="
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Value: "User-Agent|3a 20|Mozilla/5.0 (Windows|3b 20|U|3b 20|Windows NT 6.1|3b|"
Within:
PCRE: "/\/[a-z0-9]{16}.php\?ufw=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/U"
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_header