ET MALWARE FinSpy Related Flash Installer Activity

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:".asp?attachmentid=";
content:"&d="; distance:0;
http.request_body;
content:"|c3 d6 21 f6 77 d7 95 61 2a 27 22 8b 2a d4 c9 16|"; fast_pattern; bsize:16;
http.header_names;
content:!"Referer";
Raw source ET MALWARE FinSpy Related Flash Installer Activity · 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 FinSpy Related Flash Installer Activity";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".asp?attachmentid=";
    content:"&d="; distance:0;
    http.request_body;
    content:"|c3 d6 21 f6 77 d7 95 61 2a 27 22 8b 2a d4 c9 16|"; fast_pattern; bsize:16;
    http.header_names;
    content:!"Referer";
    reference:md5,a55aa68518586381213cd85441aa4e16;
    reference:url,www.amnesty.org/en/latest/research/2020/09/german-made-finspy-spyware-found-in-egypt-and-mac-and-linux-versions-revealed/;
    classtype:trojan-activity;
    sid:2030914; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2020_09_28, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_28;
)

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