ET WEB_SERVER Possible WebShell Access Inbound [upload] M1 (CISA AA21-259A)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"?act=upload"; fast_pattern;
content:"&path=";
content:"&context=";
Raw source ET WEB_SERVER Possible WebShell Access Inbound [upload] M1 (CISA AA21-259A) · 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 -> [$HOME_NET,$HTTP_SERVERS] any (
    msg:"ET WEB_SERVER Possible WebShell Access Inbound [upload] M1 (CISA AA21-259A)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"?act=upload"; fast_pattern;
    content:"&path=";
    content:"&context=";
    reference:url,us-cert.cisa.gov/ncas/alerts/aa21-259a;
    classtype:attempted-user;
    sid:2034009; rev:1;
    metadata:attack_target Server, created_at 2021_09_22, deployment Perimeter, confidence Medium, signature_severity Major, tag WebShell, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_22, mitre_tactic_id TA0003, mitre_tactic_name Persistence, mitre_technique_id T1505, mitre_technique_name Server_Software_Component;
)

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.