ET MALWARE Likely Evil Request for uac.exe With Minimal Headers

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/uac.exe"; endswith; fast_pattern;
http.header_names;
content:!"Referer";
content:!"User-Agent";
content:"|0d 0a|Host|0d 0a|"; depth:10;
isdataat:!20,relative; bsize:<31;
Raw source ET MALWARE Likely Evil Request for uac.exe With Minimal Headers · Suricata
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Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Likely Evil Request for uac.exe With Minimal Headers";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/uac.exe"; endswith; fast_pattern;
    http.header_names;
    content:!"Referer";
    content:!"User-Agent";
    content:"|0d 0a|Host|0d 0a|"; depth:10;
    isdataat:!20,relative; bsize:<31;
    reference:md5,fd66c2729efe28d54dbbdca62490b936;
    classtype:trojan-activity;
    sid:2032794; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_04_21, deployment Perimeter, confidence Medium, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_04_21;
)

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