ET RETIRED W32/NSIS.TrojanDownloader Second Stage Download Instructions from Server

alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (
    msg:"ET RETIRED W32/NSIS.TrojanDownloader Second Stage Download Instructions from Server";
    flow:established,to_client;
    content:"|3B 20|Ini download file modue"; nocase; fast_pattern;
    content:"DownUrl="; nocase; distance:0;
    content:"FileName="; nocase; distance:0;
    content:"SaveType="; nocase; distance:0;
    pcre:"/FileName\x3D[^\r\n]*\x2E(dll|exe)/i";
    reference:md5,3ce5da32903b52394cff2517df51f599;
    classtype:trojan-activity;
    sid:2014312; rev:4;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, tls_state plaintext, created_at 2012_03_06, deployment Perimeter, deployment Internal, former_category MALWARE, malware_family W32_NSIS_TrojanDownloader, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_12_05, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
    target:dest_ip;
)