Rule History

SID: 2033990 • Source: et/open

Versions (4)

Version DetailsCurrent

Rev: 2 • Sep 21, 2021, 12:00 PM

Message:

ET MALWARE NSIS/TrojanDownloader.Agent.NZK CnC Activity M1

Rule:

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE NSIS/TrojanDownloader.Agent.NZK CnC Activity M1"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/ntuser.txt"; bsize:11; fast_pattern; http.user_agent; content:"NSIS|5f|Inetc|20 28|Mozilla|29|"; bsize:20; reference:md5,168feb87d7264b4ee2b39cffd7d3b5e3; classtype:command-and-control; sid:2033990; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_09_21, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_21;)

Created:

Sep 21, 2021, 12:00 PM

Updated:

Sep 21, 2021, 12:00 PM

DB Created:

Sep 21, 2024, 3:00 AM

DB Updated:

Sep 8, 2025, 9:34 PM

Filename:

rules/emerging-malware.rules