Rule History

alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Possible HijackLoader Second Stage PNG Retrieval"; flow:established,to_client; file.data; content:"|89|PNG|0d 0a 1a 0a|"; startswith; content:"IDAT|c6 a5 79 ea|"; within:50; fast_pattern; reference:url,www.crowdstrike.com/blog/hijackloader-expands-techniques/; reference:url,www.rapid7.com/blog/post/2023/08/31/fake-update-utilizes-new-idat-loader-to-execute-stealc-and-lumma-infostealers/; reference:url,blog.morphisec.com/unveiling-uac-0184-the-remcos-rat-steganography-saga; classtype:trojan-activity; sid:2051761; 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 TLSDecrypt, created_at 2024_03_21, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence Low, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_21; target:dest_ip;)