ET MALWARE FRAMEREST Web Shell Activity Observed

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.cookie;
content:"DSID|3d|"; fast_pattern;
pcre:"/^[-A-Za-z0-9+/=]{65,}/R"; bsize:>69;
target:dest_ip;
Raw source ET MALWARE FRAMEREST Web Shell Activity Observed · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE FRAMEREST Web Shell Activity Observed";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.cookie;
    content:"DSID|3d|"; fast_pattern;
    pcre:"/^[-A-Za-z0-9+/=]{65,}/R"; bsize:>69;
    reference:url,www.mandiant.com/resources/blog/investigating-ivanti-zero-day-exploitation;
    classtype:trojan-activity;
    sid:2050651; rev:1;
    metadata:affected_product Ivanti, attack_target Networking_Equipment, created_at 2024_01_31, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence Medium, signature_severity Major, updated_at 2024_01_31, reviewed_at 2025_07_14;
    target:dest_ip;
)

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