ET HUNTING Suspicious Accept in HTTP POST - Possible Alphacrypt/TeslaCrypt

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:".php"; endswith;
http.accept;
pcre:"/^(?!m(?:ultipart|essage|odel)|a(?:pplication|udio|ccept)|(?:exampl|imag)e|video|text|\*)/i";
http.header_names;
content:"|0d 0a|Accept|0d 0a|"; depth:10; fast_pattern;
content:!"Referer";
content:"Accept";
Raw source ET HUNTING Suspicious Accept in HTTP POST - Possible Alphacrypt/TeslaCrypt · Suricata
Esc
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 HUNTING Suspicious Accept in HTTP POST - Possible Alphacrypt/TeslaCrypt";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".php"; endswith;
    http.accept;
    pcre:"/^(?!m(?:ultipart|essage|odel)|a(?:pplication|udio|ccept)|(?:exampl|imag)e|video|text|\*)/i";
    http.header_names;
    content:"|0d 0a|Accept|0d 0a|"; depth:10; fast_pattern;
    content:!"Referer";
    content:"Accept";
    reference:md5,35a6de1e8dbea19bc44cf49ae0cae59e;
    classtype:trojan-activity;
    sid:2022502; rev:7;
    metadata:created_at 2016_02_11, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_19, reviewed_at 2024_04_11;
)

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