alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Unknown InfoStealer CnC Checkin"; flow:established,to_server; dsize:45; content:"|ff ff 02 28 00|"; fast_pattern; startswith; reference:md5,aed84b4b8397afda419da88630d1fb5d; reference:md5,efe6c1af337c32af1e66ed70ceb34dea; classtype:trojan-activity; sid:2051603; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, tls_state plaintext, created_at 2024_03_11, deployment Perimeter, confidence High, signature_severity Major, tag InfoStealer, updated_at 2024_03_11; target:src_ip;)