Rule History

SID: 2031271 • Source: et/open

Versions (3)

Version DetailsCurrent

Rev: 2 • Dec 8, 2020, 12:00 PM

Message:

ET WEB_SERVER Generic Webshell Accessed on Internal Compromised Server

Rule:

alert http $HTTP_SERVERS any -> $EXTERNAL_NET any (msg:"ET WEB_SERVER Generic Webshell Accessed on Internal Compromised Server"; flow:established,to_client; file.data; content:"c99shell</title>"; nocase; fast_pattern; content:"<b>C99Shell v. "; nocase; distance:0; classtype:web-application-attack; sid:2031271; rev:2; metadata:affected_product Web_Server_Applications, attack_target Web_Server, created_at 2020_12_08, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_12_08;)

Created:

Dec 8, 2020, 12:00 PM

Updated:

Dec 8, 2020, 12:00 PM

DB Created:

Sep 21, 2024, 3:00 AM

DB Updated:

Sep 15, 2025, 9:36 PM

Filename:

rules/emerging-web_server.rules