ET HUNTING HTTP GET Request for nss3.dll - Possible Infostealer Activity

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"nss3.dll"; fast_pattern;
xbits:set,ET.infostealer.pattern.1,track ip_src,expire 15;
xbits:set,ET.infostealer.pattern.2,track ip_pair,expire 15;
flowint:ET.infostealer.dll.download, +, 1;

Rule dependencies

Feeds into

  • Nothing indexed reads ET.infostealer.pattern.1.
  • Nothing indexed reads ET.infostealer.pattern.2.
Raw source ET HUNTING HTTP GET Request for nss3.dll - Possible Infostealer 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 HUNTING HTTP GET Request for nss3.dll - Possible Infostealer Activity";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"nss3.dll"; fast_pattern;
    xbits:set,ET.infostealer.pattern.1,track ip_src,expire 15;
    xbits:set,ET.infostealer.pattern.2,track ip_pair,expire 15;
    flowint:ET.infostealer.dll.download, +, 1;
    classtype:suspicious-filename-detect;
    sid:2044305; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_02_22, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence Low, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_02_22;
)

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