alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Arkei Stealer CnC Checkin (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; bsize:12; content:"/tratata.php"; startswith; fast_pattern; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; content:!"|0d 0a|user-agent|0d 0a|"; http.header; header_lowercase; content:"cache-control|3a 20|no-cache"; reference:url,blogs.blackberry.com/en/2022/02/threat-thursday-arkei-infostealer?utm_medium=social&utm_source=bambu; classtype:trojan-activity; sid:2035393; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_03_03, deployment Perimeter, malware_family Arkei, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_20, reviewed_at 2024_06_26;)