alert tcp-pkt $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET MALWARE Base64 Encoded MZ In Image"; flow:established,to_client; content:"|3c 3c|BASE64|5f|START|3e 3e|TVqQAAMAAAAEAAAA"; reference:url,twitter.com/Jane_0sint/status/1694972207896699387; reference:url,cyble.com/blog/threat-actor-employs-powershell-backed-steganography-in-recent-spam-campaigns; classtype:trojan-activity; sid:2047750; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_08_25, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_10_31, reviewed_at 2023_08_25;)