alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Win32/Stealc Active C2 Responding with browsers Config M2"; flow:established,to_client; flowbits:isset,ET.stealc.browsers; flowbits:unset,ET.stealc.browsers; http.stat_code; content:"200"; file.data; content:"AEdvb2dsZSBDaHJvbWV8"; fast_pattern; startswith; reference:url,blog.sekoia.io/stealc-a-copycat-of-vidar-and-raccoon-infostealers-gaining-in-popularity-part-1/; classtype:command-and-control; sid:2051829; 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_28, deployment Perimeter, malware_family Stealc, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_28; target:dest_ip;)