ET MALWARE upStage Residential Proxy CnC Response

Query · suricata

flow:established,to_client;
flowbits:isset,ET.upStage;
dsize:<50;
content:"ipsa"; depth:6;
target:dest_ip;

Rule dependencies

⚠ Higher-order rule. It fires on other rules' alerts, not on raw events, so it cannot fire on its own. Deploy the rules it depends on too.

Depends on

Raw source ET MALWARE upStage Residential Proxy CnC Response · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp $EXTERNAL_NET [1000,1001,1002] -> $HOME_NET any (
    msg:"ET MALWARE upStage Residential Proxy CnC Response";
    flow:established,to_client;
    flowbits:isset,ET.upStage;
    dsize:<50;
    content:"ipsa"; depth:6;
    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:2067603; 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, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
    target:dest_ip;
)

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