ET MALWARE [FIREEYE] SLIGHTPULSE Webshell Activity M3

Query · suricata

flow:established,to_client;
flowbits:isset,ET.slightpulseM2;
http.stat_code;
content:"200";
http.header;
content:"Cache-Control|3a 20|no-cache|0d 0a|";
http.content_type;
content:"image/gif"; bsize:9; fast_pattern;
file.data;
content:!"<br>";

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 M3 · Suricata
Esc
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 M3";
    flow:established,to_client;
    flowbits:isset,ET.slightpulseM2;
    http.stat_code;
    content:"200";
    http.header;
    content:"Cache-Control|3a 20|no-cache|0d 0a|";
    http.content_type;
    content:"image/gif"; bsize:9; fast_pattern;
    file.data;
    content:!"<br>";
    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:command-and-control;
    sid:2032913; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2021_05_05, deployment Perimeter, deployment SSLDecrypt, performance_impact Significant, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_05_05;
)

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