ET MALWARE upStage Residential Proxy CnC Checkin

alert tcp $HOME_NET any -> $EXTERNAL_NET [1000,1001,1002] (
    msg:"ET MALWARE upStage Residential Proxy CnC Checkin";
    flow:established,to_server;
    flowbits:set,ET.upStage;
    dsize:<30;
    content:"heroLV"; fast_pattern;
    reference:url,www.malwarebytes.com/blog/threat-intel/2026/02/fake-7-zip-downloads-are-turning-home-pcs-into-proxy-nodes;
    reference:url,blog.lukeacha.com/2026/01/beware-of-fake-7zip-installer-upstage.html;
    classtype:trojan-activity;
    sid:2067602; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2026_02_11, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag RAT, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_02_11;
    target:src_ip;
)