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Rev: 1 • Aug 13, 2024, 12:00 PMET MALWARE Oyster Backdoor Domain in DNS Lookup (firstcountryours .eu)
alert dns $HOME_NET any -> any any (msg:"ET MALWARE Oyster Backdoor Domain in DNS Lookup (firstcountryours .eu)"; dns.query; bsize:19; content:"firstcountryours.eu"; nocase; reference:url,hunt.io/blog/a-simple-approach-to-discovering-oyster-backdoor-infrastructure; classtype:trojan-activity; sid:2055257; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2024_08_13, deployment Perimeter, malware_family Oyster_Backdoor, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_08_13, reviewed_at 2024_12_17;)
Aug 13, 2024, 12:00 PM
Aug 13, 2024, 12:00 PM
Sep 21, 2024, 3:00 AM
Jul 30, 2025, 9:35 PM
rules/emerging-malware.rules