alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed ACR Stealer Domain (frjk .xyz) in TLS SNI"; flow:established,to_server; tls.sni; bsize:8; content:"frjk.xyz"; fast_pattern; 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:2052696; 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;)