Rule History

alert dns $HOME_NET any -> any any (msg:"ET MALWARE ACR Stealer CnC Domain in DNS Lookup"; dns.query; bsize:8; content:"frfk.xyz"; nocase; reference:url,malpedia.caad.fkie.fraunhofer.de/details/win.acr_stealer; reference:url,threatfox.abuse.ch/browse/malware/win.acr_stealer/; classtype:trojan-activity; sid:2052684; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2024_05_16, deployment Perimeter, malware_family ACR_Stealer, performance_impact Low, confidence High, signature_severity Major, updated_at 2024_05_16, reviewed_at 2025_07_14;)