ET MALWARE [FIREEYE] SLIGHTPULSE Webshell Activity M2

Query · suricata

flow:established,to_client;
flowbits:isset,ET.slightpulseM2;
http.stat_code;
content:"200";
http.content_type;
content:"application/x-download"; bsize:22;
http.header;
content:"Content-Disposition|3a 20|attachment|3b 20|filename=tmp|0d 0a|"; fast_pattern;

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 [FIREEYE] SLIGHTPULSE Webshell Activity M2 · 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 any any -> any any (
    msg:"ET MALWARE [FIREEYE] SLIGHTPULSE Webshell Activity M2";
    flow:established,to_client;
    flowbits:isset,ET.slightpulseM2;
    http.stat_code;
    content:"200";
    http.content_type;
    content:"application/x-download"; bsize:22;
    http.header;
    content:"Content-Disposition|3a 20|attachment|3b 20|filename=tmp|0d 0a|"; fast_pattern;
    reference:url,github.com/fireeye/pulsesecure_exploitation_countermeasures;
    reference:url,www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.html;
    classtype:trojan-activity;
    sid:2032912; rev:1;
    metadata:attack_target Server, created_at 2021_05_05, deployment Perimeter, deployment SSLDecrypt, performance_impact Moderate, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_05_05;
)

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